Article
Materials Science, Multidisciplinary
Jianbing Gao, Zhenlin Xu, Xudong Fang, Junjing He, Weihuo Li, Xiaojie Du, Yizhu He, Xiquan Jia, Shengxuan Zhou
Summary: In this study, the effect of aging on the creep resistance of a Fe-Cr-Ni medium-entropy alloy (MEA) was investigated. The precipitate evolution in the aged MEA was analyzed, and it was found that the nano-sized Cu-rich and NbC precipitates significantly improved the creep resistance after long-term aging.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Chemistry, Physical
Bharat Gwalani, Shivakant Shukla, Donovan Leonard, Jonathan D. Poplawsky, Dean T. Pierce, Libor Kovarik, Govindarajan Muralidharan, Arun Devaraj
Summary: The study investigates the phase stability and microstructural evolution of Ni-Fe-Cr-Al-Ti alloys, and discusses the influence of heat treatment on the alloy's microstructure. Long-term aging was found to result in the coarsening and shape change of gamma' precipitates, as well as the formation of eta phase precipitates.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
P. Changizian, Z. Yao, M. R. Daymond
Summary: TEM analysis was employed to study deformation mechanisms in X-750 Ni-based superalloy, showing that planar slip resulted in the formation of planar slip bands due to low stacking fault energy and shearing of ordered gamma'-precipitates. The shearing of gamma'-precipitates occurred through APB or SF mechanisms evidenced by superlattice or stacking faults.
MATERIALS CHARACTERIZATION
(2021)
Article
Nanoscience & Nanotechnology
Yunsheng Wu, Xiangxiang Zhang, Changshuai Wang, Xuezhi Qin, Jieshan Hou, Lanzhang Zhou
Summary: The creep deformation behavior and microstructure evolution of the Ni-Fe-based GH984G alloy were investigated. The interaction between dislocation and gamma' precipitates is the main reason for the higher creep activation energy than lattice self-diffusion. Dislocation climbing is the primary creep mechanism below 800℃, while dislocation climbing and partial dislocation shearing into gamma' dominate above 800℃. Additionally, microstructural degradation also contributes to creep damage.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Crystallography
Fei Sun
Summary: A new Ni-Fe-based alloy has been developed for 700 degrees C-class A-USC steam turbine rotor application, exhibiting excellent creep rupture life. The alloy has high yield strength at 700 degrees C and shows different fracture modes at various temperatures. Dynamic recrystallization occurred during tensile tests and influenced the deformation mechanisms. These findings provide valuable experimental evidence for the development and optimization of high-temperature alloys for 700 degrees C-class A-USC applications.
Article
Nanoscience & Nanotechnology
Yeshun Huang, Rui Zhang, Zijian Zhou, Peng Zhang, Jingbo Yan, Yong Yuan, Yuefeng Gu, Chuanyong Cui, Yizhou Zhou, Xiaofeng Sun
Summary: The tensile properties and deformation mechanisms of a Fe-Ni-based superalloy were investigated at 700 degrees C with different sizes of gamma ' precipitates obtained through varied aging time. The yield strength of the alloy increased first and then decreased with the increase of aging time, which was consistent with the change of critical resolved stress of deformation mechanism. The dominant deformation mode changed from weakly-coupled dislocation pairs with slip bands to Orowan looping as the size of gamma ' precipitates increased, resulting in the occurrence of peak value of strength. When the gamma ' size was above 40 nm, the dominant deformation mechanism was Orowan bowing along with stacking fault shearing, decreasing the yield strength of the alloy. When the gamma ' size was between 30 nm and 40 nm, the dominant deformation mechanism was Orowan looping with strongly-coupled dislocation pairs and the fracture mode was intergranular. Intermediate temperature brittleness occurred in the secondary aging treated alloy with a gamma ' phase size of approximately 30 nm, which was attributed to the increase in critical resolved stress and strain localization caused by the transformation of tensile deformation mechanism, and stress concentration due to dislocation entanglement at grain boundary. The sub-aging state of the alloy used for advanced ultra-supercritical plants may be a good choice for obtaining simultaneously favorable strength and ductility.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Eduardo Perez-Badillo, Hector J. Dorantes-Rosales, Maribel L. Saucedo-Munoz, Victor M. Lopez-Hirata
Summary: This study focused on analyzing phase transformation in Fe-Ni-Al alloys using a diffusion couple of Ni/Fe-Ni-Al/Fe and Calphad-based diffusion and thermodynamic software. Diffusion couples were prepared by annealing at 1100 degrees C for 200 h and then air-cooled. The results showed that the diffusion path between Ni or Fe pure metal and the Fe-33at.%Ni-33at.%Al alloy is not linear. Aging at 750 degrees C promoted inverse precipitation beta'-> beta' + alpha, causing the softening of the alloy. Normal precipitation reactions, alpha ->alpha +beta' and gamma -> gamma +gamma', were also observed during aging at 750 degrees C, resulting in precipitation hardening.
Article
Materials Science, Multidisciplinary
Yuntian Luo, Yuan Zhuang, Chen Li, Shuaidi Li, Guoning Bao, Tao Wei, Shaohui Sha, Xiaojing Xu
Summary: 700-MPa-grade aluminum alloys were processed by T6 and T6I4 aging treatments. It was found that T6I4 aged AA exhibited fine matrix precipitates, narrow precipitate free zones, and discontinuous distribution of grain boundary precipitates, while T6 aged AA showed the opposite characteristics. The high tensile strength of T6I4 aged AA was attributed to the uniform distribution of fine matrix precipitates, while the continuous grain boundary precipitates in T6 aged AA promoted intergranular corrosion.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2022)
Article
Chemistry, Physical
Jiejun He, Lushu Wu
Summary: An obvious strengthening phenomenon has been observed in the Mg-6Al-1Zn (AZ61) alloy after simultaneous loading and aging at 170 degrees C. This simultaneous loading and aging process can increase the yield stress of the alloy by promoting the formation of a larger quantity of Al12Mg17 precipitates. The loading during aging is speculated to be more beneficial for nucleation of the precipitates, leading to a higher yield stress compared to aging after pre-strain.
Article
Nanoscience & Nanotechnology
Akbar Heidarzadeh, Janez Zavasnik, Rajashekhara Shabadi, Reza Taherzadeh Mousavian
Summary: This study revealed the deformation mechanisms and reasons for excellent ductility in additively manufactured Fe-Cr-Ni stainless steels by laser powder bed fusion through interrupted tensile tests, electron backscattered diffraction, and transmission electron microscopy. The results showed different deformation mechanisms like dislocation slip, twining-induced plasticity, and dynamic recrystallization, opening a new operation window for the production of other types of TWIP steels by L-PBF.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
R. G. Li, H. R. Li, H. C. Pan, D. S. Xie, J. H. Zhang, D. Q. Fang, Y. Q. Dai, D. Y. Zhao, H. Zhang
Summary: This study found that ultra-high strength can be obtained in a simple binary Mg-Gd alloy with a small extrusion ratio. This is mainly attributed to the strong texture and internal dislocation pinning in the un-dynamically recrystallized region. Furthermore, aging precipitation only occurs within the large un-DRXed grains, leading to a significant increase in tensile yield strength. Thus, the ultra-high strength of this alloy is mainly related to texture strengthening and precipitation strengthening.
SCRIPTA MATERIALIA
(2021)
Article
Chemistry, Physical
He Zhang, Jun-Ru Liu, Guo-Hua Zhang
Summary: This study successfully prepared high-performance W-Cu-Ni-Fe alloys with the addition of Ni and Fe using low temperature liquid-phase sintering. The additions of Ni and Fe improved the bonding strength and wettability of the alloy, resulting in enhanced mechanical properties. Moreover, the Ni and Fe additions also increased the compressive strength and solid solution strengthening effects of the alloy. However, it led to a decrease in the electrical conductivity.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
Peng Liu, Rui Zhang, Yong Yuan, Chuanyong Cui, Faguang Liang, Xi Liu, Yuefeng Gu, Yizhou Zhou, Xiaofeng Sun
Summary: The study investigated the influence of nitrogen content on a newly developed Ni-Fe based superalloy for ultra-supercritical power plant applications beyond 700℃. The results showed that an increase in nitrogen content promoted changes in carbide morphology and grain boundary phase formation, with little effect on yield and tensile strength but significantly improving ductility. The alloy exhibited a mixture fracture mode and a dominant deformation mechanism of gamma ' bypassing via Orowan looping.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Jongun Moon, Elena Tabachnikova, Sergii Shumilin, Tetiana Hryhorova, Yuri Estrin, Jamieson Brechtl, Peter K. Liaw, Wenqing Wang, Karin A. Dahmen, Alireza Zargaran, Jae Wung Bae, Hyeon-Seok Do, Byeong-Joo Lee, Hyoung Seop Kim
Summary: The medium-entropy alloy Co17.5Cr12.5Fe55Ni10Mo5 demonstrates excellent mechanical properties at cryogenic temperatures, showing high strength, ductility, and strain hardening. It exhibits several unusual features within the extremely low temperature range of 0.5-4.2 K, including anomalies in the temperature dependence of yield strength and tensile ductility, discontinuous plastic deformation (DPF), and changes in deformation-induced martensitic transformation tendency. The observed phenomena may be interrelated and require further investigation.
Article
Chemistry, Physical
Reliance Jain, M. R. Rahul, Poulami Chakraborty, Rama Krushna Sabat, Sumanta Samal, Gandham Phanikumar, Raghvendra Tewari
Summary: In the present study, a novel single-phase FCC high entropy alloy was developed using the ICME approach. The composition guided by simulation was validated and the deformation behavior of the alloy at elevated temperature was discussed. This study demonstrates the rationalization of deformation behavior based on microstructure evolution using EBSD.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Nanoscience & Nanotechnology
Peng Liu, Rui Zhang, Yong Yuan, Chuanyong Cui, Faguang Liang, Xi Liu, Yuefeng Gu, Yizhou Zhou, Xiaofeng Sun
Summary: The study investigated the influence of nitrogen content on a newly developed Ni-Fe based superalloy for ultra-supercritical power plant applications beyond 700℃. The results showed that an increase in nitrogen content promoted changes in carbide morphology and grain boundary phase formation, with little effect on yield and tensile strength but significantly improving ductility. The alloy exhibited a mixture fracture mode and a dominant deformation mechanism of gamma ' bypassing via Orowan looping.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
C. Z. Zhu, R. Zhang, C. Y. Cui, Y. Z. Zhou, F. G. Liang, X. Liu, X. F. Sun
Summary: This study found that increasing Ta content influences the creep behavior of a Ni-Co base disc superalloy, leading to a trend of first increasing and then decreasing creep rupture life and minimum creep strain rate. Ta addition promoted the increase of gamma' volume fraction while inhibiting the growth and precipitation of certain carbides.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Metallurgy & Metallurgical Engineering
Zijian Zhou, Rui Zhang, Chuanyong Cui, Yizhou Zhou, Xiaofeng Sun
Summary: A series of homogenization treatments were conducted on a Ni-Co based superalloy prepared through directional solidification to reduce microsegregation. Element segregation characteristics and microstructural evolution were investigated using various microscopy techniques, showing non-uniform distribution of elements, with W and Ti exhibiting the greatest tendency of microsegregation. Optimal single-stage homogenization process was determined to be at 1180 degrees C for 2 h, with a kinetic diffusion model built to estimate the diffusion coefficients of W and Ti.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Yingbo Bai, Rui Zhang, Yang Qi, Chuanyong Cui, Yahui Cai
Summary: The study demonstrated that ball milling enhances the sintering activity of Ni-Co based superalloy powders, while a master alloy with low C content leads to a more uniform microstructure. After solution treatment, the Y2O3 network reinforced alloy showed improved hardness and better overall properties.
Article
Materials Science, Multidisciplinary
Peng Liu, Rui Zhang, Yong Yuan, Chuanyong Cui, Faguang Liang, Xi Liu, Yuefeng Gu, Yizhou Zhou, Xiaofeng Sun
Summary: The effects of strain rate on the microstructural evolution and deformation mechanism of a Ni-Co based superalloy were investigated through isothermal compression tests. It was found that the primary gamma' particles played a significant role in accelerating and retarding dynamic recrystallization (DRX), while discontinuous dynamic recrystallization (DDRX) was identified as the dominant mechanism.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Nanoscience & Nanotechnology
Zijian Zhou, Rui Zhang, Chuanyong Cui, Yizhou Zhou, Xiaofeng Sun
Summary: This study investigated the deformation mechanisms and hot compression behaviors of a Ni-Co-based superalloy prepared using directional solidification. The effects of temperature and strain rate on dynamic recrystallization were analyzed, and constitutive equations were established. The dominant deformation mechanisms were found to be dependent on the strain rate and temperature.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Physical
C. Z. Zhu, R. Zhang, C. Y. Cui, Y. Z. Zhou, J. L. Qu, B. Gan, B. J. Zhang, X. F. Sun
Summary: The effect of pre-strain treatment on the mechanical properties of a Ni-Co base disk superalloy was investigated. The results showed that pre-strain treatment at 725 degrees C/630 MPa improved the yield strength of the alloy at both 23 degrees C and 760 degrees C. However, the creep life of the alloy at 760 degrees C/480 MPa was reduced by pre-strain treatment. Microstructural analysis revealed the presence of microtwins and Suzuki segregations introduced by the pre-strain treatment, which had both positive and negative effects on the mechanical properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
Yongchao Gai, Rui Zhang, Jinxia Yang, Chuanyong Cui, Jinglong Qu
Summary: The effects of different heat treatments on the microstructures and mechanical properties of a wrought superalloy GH4151 were investigated. The solution treatments influenced the area fraction of gamma' precipitates and the grain size of the matrix. A dissolution kinetics model of primary gamma' precipitates was calculated. It was found that the fine primary gamma' precipitates dissolved first when the solution temperature was below 1120 degrees C, while the coarse primary gamma' precipitates dissolved noticeably when the solution temperature was above 1130 degrees C. Additionally, grain growth occurred at solution temperatures above 1130 degrees C. Furthermore, a higher area fraction of secondary gamma' precipitates with increased size was observed with higher solution temperatures. Tensile tests revealed that the alloy solution treated at 1130 degrees C possessed the optimum tensile properties at 750 degrees C due to the high area fraction of medium-sized secondary gamma' precipitates.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Zijian Zhou, Rui Zhang, Chuanyong Cui, Yizhou Zhou, Xiaofeng Sun, Jinglong Qu, Yu Gu, Jinhui Du, Yi Tan
Summary: Deformation twinning is an important mechanism in nickel-based superalloys. In this study, the formation of microtwins at high temperatures in Ni-Co-based superalloys was investigated using transmission electron microscopy. The results showed that the formation of microtwins at high temperatures can be attributed to the low stacking fault energy and poor dislocation-driven deformations caused by the high strain rate in specific directions.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Zijian Zhou, Rui Zhang, Chuanyong Cui, Yizhou Zhou, Xiaofeng Sun
Summary: In this study, the influence of solution temperature on the microstructure evolution and creep behavior of a new Ni-Co base superalloy for turbine discs was investigated. The results showed that the creep fracture life first increased and then decreased with increasing solution temperature. The alloy solution treated at 1140 degrees C exhibited the best creep properties, with a creep life of 209 h. The enhanced creep performance of this alloy can be explained by the increased volume fraction of GB carbides, the stress relief provided by diffuse fine granular carbides, and the rapid dissolution of coarse primary gamma ' phases.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Yingbo Bai, Rui Zhang, Chuanyong Cui, Yizhou Zhou, Xiaofeng Sun
Summary: Intermediate temperature embrittlement (ITE) is widely present in Ni-based superalloys, which significantly restricts the processing and service properties of these alloys. The ITE in a Ni-based wrought superalloy GH4065A was eliminated through long-term aging treatment. With prolonged aging time, the fracture characteristics of the alloy transitioned from intergranular fracture to dimple fracture. EDS and AES observations revealed that intergranular diffusion and segregation of W and Mo elements enhanced the grain boundary strength of the long-term aging alloy. Intergranular M6C carbide precipitates have also been found to promote plastic deformation.
Article
Chemistry, Physical
Rashad A. Al-Hammadi, Rui Zhang, Chuanyong Cui, Zijian Zhou, Yizhou Zhou
Summary: The effects of deformation temperatures on the superplastic behavior, microstructure evolution, and failure mechanisms of Ni-Co-based superalloy were analyzed. The superplastic-tensile temperatures have significant effects on flow behavior, which shows distinctive features of dynamic recrystallization (DRX). The alloy exhibits a striking increase in elongation with increasing the superplastic-tensile temperature to 1100 degrees C, reaching 1760 %.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Yongchao Gai, Rui Zhang, Zijian Zhou, Shaomin Lv, Chuanyong Cui, Xingfei Xie, Jinglong Qu
Summary: Isothermal compression tests were conducted on a Ni-based superalloy at sub-solvus (1140°C) and super-solvus (1170°C) temperatures, and the effects of C contents on the microstructural evolution and hot deformation behavior of the alloy were investigated. It was found that the formation of MC carbide is closely related to the C content, and the initial grain size slightly decreased with increasing C content. The peak stress increased with increasing C content during compression deformation at 1140°C, while the 0.04 wt% C alloy exhibited the lowest peak stress and the 0.08 wt% C alloy exhibited the highest peak stress during deformation at 1170°C.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Rashad A. Al-Hammadi, Rui Zhang, Chuanyong Cui, Zijian Zhou, Yizhou Zhou
Summary: A coarse-grained alloy with an average grain size of 85 μm exhibited near-superplastic tensile elongation at high temperature and strain rate. Dynamic recrystallization process alleviated stress concentration and damage accumulation, thereby improving the ductility of the material.
Article
Nanoscience & Nanotechnology
Ahmad Mirzaei, Peter D. Hodgson, Xiang Ma, Vanessa K. Peterson, Ehsan Farabi, Gregory S. Rohrer, Hossein Beladi
Summary: This study investigated the influence of parent austenite grain refinement on the intervariant boundary network in a lath martensitic steel. It found that refining the parent austenite grain led to a decrease in the fraction of certain boundaries in the martensite and an increase in the connectivity of low energy boundaries, ultimately improving the impact toughness.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
N. L. Church, C. E. P. Talbot, L. D. Connor, S. Michalik, N. G. Jones
Summary: Metastable beta Ti alloys based on the Ti-Nb system have attracted attention due to their unique properties. However, the unstable cyclic behavior of these alloys has hindered their widespread industrial use. Recent studies have shown that internal stresses, including those from dislocations, may be responsible for this behavior. This study demonstrates that inter-cycle thermal treatments can mitigate the unstable cyclic behavior, providing a significant breakthrough in our understanding of Ti-Nb superelastic materials.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Di Zhao, Chenchen Zhao, Ziyang Xiu, Jiuchun Yan
Summary: This study proposes a novel strategy for achieving the bonding of SiC ceramic and Al alloy using ultrasound. The ultrasound promotes the dissolution of Al into the solder, activating the solder and triggering the interfacial reaction between SiC ceramic and solder. With increasing ultrasonic duration, the bonding between SiC and Al transitions from partial to full metallurgical bonding.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Kang Du, Yang Zhang, Guangda Zhao, Tao Huang, Liyuan Liu, Junpeng Li, Xiyu Wang, Zhongwu Zhang
Summary: This paper systematically investigated the evolution of microstructure in Fe-Ni-Co-Al polycrystalline alloys and its effects on mechanical properties. The results revealed that the migration of grain boundaries in different processes is driven by different factors, which impacts the grain orientation and precipitate formation. In the process of directional recrystallization, grains with specific orientations grow in the grain boundary region and form the dominant orientation, while grains with lower migration rate form the minor orientation. The alloy produced through directional recrystallization exhibited good recoverable strain and superelastic strain, while the alloy produced through solid solution treatment showed no evident superelastic behavior.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Edohamen Awannegbe, Liang Chen, Yue Zhao, Zhijun Qiu, Huijun Li
Summary: This study employed laser metal deposition to additively manufacture Ti-15Mo wt% alloy, and subsequently subjected it to post-fabrication uniaxial thermomechanical processing. The results showed that different zones in the microstructure remained after processing, and deformation mechanisms mainly involved slip and martensite formation. The compressive mechanical properties were found to be dependent on strain rate, with higher flow stress and compressive strength observed at higher strain rates. Grain structure homogenisation was not achieved, leading to anisotropic tensile properties.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Reza Khatib Zadeh Davani, Enyinnaya George Ohaeri, Sandeep Yadav, Jerzy A. Szpunar, Jing Su, Michael Gaudet, Muhammad Rashid, Muhammad Arafin
Summary: This research aims to investigate the effect of roughing and finishing reductions on crystallographic texture. The results show significant heterogeneity in the centerline region, with higher intensity of certain textures. Drop Weight Tear Test indicates that steel specimens with lower and medium reductions exhibit superior low-temperature impact toughness compared to steel with higher reductions. The electrochemical hydrogen charging experiments confirm the presence of internal hydrogen cracks only in steel with lower and medium reductions.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Flavio De Barbieri, Denis Jorge-Badiola, Rodrigo Allende, Karem Tello, Alfredo Artigas, Franco Perazzo, Henry Jami, Juan Perez Ipina
Summary: This study examines the effect of Cr additions on the mechanical behavior of TWIP steel at temperatures ranging from 25°C to 350°C. The results indicate that different temperature-dependent strengthening mechanisms, including mechanical twinning, Dynamic Strain Aging, and slip bands, are at play. The stacking fault energy (SFE) influences the percentage of mechanical twinning, which in turn affects the strain hardening rate.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Hanlin Peng, Siming Huang, Ling Hu, Bingbing Luo, Liejun Li, Ian Baker
Summary: This study explores the weldability, microstructures, and mechanical properties of two L1(2)-nanoparticle-strengthened medium-entropy alloys after electron beam welding (EBW). The results show that strong yet ductile defect-free joints were produced, with larger grain sizes in the fusion zones compared to the heat-affected zones and base materials. Both EBWed MEAs exhibited high yield strengths, high ultimate tensile strengths, and good fracture strains at 77 K. The V-doping improved the cryogenic mechanical properties of the TMT MEA.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Yongxin Wang, Lei Chen, Lizi Shao, Shuo Hao, Motomichi Koyama, Xingzhou Cai, Xiaocong Ma, Miao Jin
Summary: This study investigated the tensile deformation behavior of an Mn-N bearing lean duplex stainless steel with metastable austenite. The results showed that the strain rate had significant influence on the work hardening, strain-induced martensitic transformation, and fracture mechanism.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Jong Woo Won, Seulbi Lee, Hye-Jeong Choe, Yong-Taek Hyun, Dong Won Lee, Jeong Hun Lee
Summary: Cold-rolled pure titanium showed improved sheet formability after undergoing cryogenic-deformation treatment. This treatment increased the thinning capability of the titanium and suppressed cracking during sheet forming. The formation of twins during deformation contributed to high thinning capability and increased strength through grain refinement and dislocation accumulation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Handong Li, Lin Su, Lijuan Wang, Yanbin Jiang, Jiahui Long, Gaoyong Lin, Zhu Xiao, Yanlin Jia, Zhou Li
Summary: Homogenization heat treatment is a key procedure in controlling the second phase, enhancing composition uniformity, and workability of as-cast Cu-15Ni-8Sn alloy. This study found that electropulsing treatment (EPT) can significantly reduce treatment temperature and time, improve elongation and overall mechanical properties of the alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Yuxuan Wang, Juntao Zou, Lixing Sun, Yunfei Bai, Zhe Zhang, Junsheng Cheng, Lin Shi, Dazhuo Song, Yihui Jiang, Zhiwei Zhang
Summary: A novel mechanical-heat-electricity synergistic method was proposed to enhance the mechanical properties of Cu-15Sn-0.3Ti alloy by forming annealing twins (ATs). The combination method of Rotary swaging (RS) and Electric pulse treatment (EPT) successfully induced recrystallization and refinement of the microstructure, leading to a significant increase in the strength of the alloy within a short time.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Zhiyi Ding, Jiangtao Xie, Tong Wang, Aiying Chen, Bin Gan, Jinchao Song
Summary: This study demonstrated the Ta-induced strengthening of CoCrNi-AlTi MEAs using nanoscale heterogeneous coherent precipitates. The addition of Ta and aging treatments significantly enhanced the mechanical properties of the alloy, including yield strength, ultimate tensile strength, and elongation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Z. Y. You, Z. Y. Tang, B. Wang, H. W. Zhang, P. Li, L. Zhao, F. B. Chu, H. Ding
Summary: The mechanical properties and microstructural evolution of C-doped TRIP-assisted HEA under dynamic loading conditions were systematically investigated in this study. The results showed that dynamic tensile deformation led to an increase in yield strength and a decrease in ultimate tensile strength, with a trend towards increased total elongation. The primary deformation mechanisms shifted from TRIP and TWIP effects to deformation twinning and dislocations. The presence of carbides formed through C-doping hindered dislocation slip and promoted the activation of multiple twinning systems.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Feng Qin, Feihu Chen, Junhua Hou, Wenjun Lu, Shaohua Chen, Jianjun Li
Summary: Plastic instability in strong multilayered composites is completely suppressed by architecting nanoscale BCC Nb crystalline-amorphous CuNb interfaces.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
