Article
Materials Science, Multidisciplinary
Lin Yuan, Jiangtao Xiong, Jin Ren, Yajie Du, Jinglong Li
Summary: A filler metal of Mn-Ni-Cr was used for transient liquid phase (TLP) bonding of FeCoNiTiAl high-entropy alloy and Ni3Al base IC10 superalloy, resulting in the formation of two isothermally solidified zones (ISZs) and an athermally solidified zone (ASZ). The absence of conventional melting-point depressants (MDPs) in the filler material prevented the formation of a diffusion affected zone (DAZ) in the bonded zone.
MATERIALS CHARACTERIZATION
(2021)
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
Cheng Yang, Rui Hu, Xingmao Wang, Jinhui Du, Xian Luo, Zhongnan Bi, Bin Gan
Summary: Stacking fault energy is reduced by adding Co to Ni-based superalloys. A novel Ni-based superalloy with 20 wt% Co content was developed, forming substructures with numerous dislocations, slip bands, and stacking faults after pre-tensile treatments. Pre-tensile alloys showed increased hindrance to dislocations, resulting in increased yield strength and improved stress rupture life.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Chemistry, Physical
Yunfei Cai, Yuanyuan Zhang, Jikang Li, Mingsheng Yang, Jiantao Liu, Tong Liu
Summary: The slow-cooling treatment can induce the formation of serrated grain boundaries, effectively enhancing the creep strength of nickel-based powder superalloys. However, this treatment also leads to the coarsening of gamma ' precipitates, which impairs their dispersion-strengthening effects. To address this issue, a high-temperature pre-precipitation treatment (HTPT) was employed to simultaneously form fine gamma ' precipitates and serrated grain boundaries. The investigation showed that decreasing the HTPT intermediate temperature resulted in an increase in the volume fraction of secondary gamma ' and a decrease in the average size of spherical tertiary gamma ' precipitates. Serrated grain boundaries were observed in samples with HTPT temperature below a certain temperature. The sample subjected to an HTPT temperature of 1130 degrees C showed the best mechanical properties at room temperature, while the 1140 degrees C sample exhibited superior performance at 750 degrees C.
Article
Engineering, Civil
Neng Luo, Tiejun Zhou, Chuntao Zhang
Summary: This study examines the residual mechanical properties of Q345 structural steel that has been previously damaged by pre-fatigue loading. The steel samples are subjected to various loading cycles, causing fatigue damage without fracture, and then tested for their stress-strain curves and associated parameters. The results show that pre-fatigue loading has a significant effect on the fracture positions, morphological features, residual strength, and ductility of Q345 steel. The residual ductility reduced significantly after cyclic loading, while the impact on the elastic modulus was negligible.
Article
Chemistry, Physical
Patricia Suarez Ocano, Anna Manzoni, Inmaculada Lopez-Galilea, Benjamin Ruttert, Guillaume Laplanche, Leonardo Agudo Jacome
Summary: Investigated the influence of cooling rate on the microstructure, hardness, and fracture toughness of the AlMo0.5NbTa0.5TiZr alloy. Slower cooling rate resulted in a coarse structure, while the fastest cooling rate led to more cubic A2 precipitates and an increase in hardness by 10%. Fracture toughness was independent of cooling rate and averaged at approximately 4.2 MPa center dot m1/2.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Nanoscience & Nanotechnology
Xueyang Zhou, Jian Chen, Rengen Ding, Haoyue Wu, Shuaidan Lu, Jiahua He, Weili Wang, Hongge Pan
Summary: A novel x'-strengthened FCC-based Al0.5CoFeNiC0.1 high entropy superalloy with a dual-phase microstructure and thermal stability exhibits superior compressive yield strengths at both room and elevated temperatures. The high-temperature yield strength is attributed to antiphase boundaries and stacking faults shearing x' particles. The dominant deformation and failure mechanisms change with temperature.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Chemistry, Physical
Pengcheng Wen, Chang Wang, Peishan Zhou, Mei Yang, Liang Wang, Bin Wang, Haiyang Wang
Summary: The 4716MA0 Ni-base superalloy was melted by vacuum induction and subjected to Ultrasonic Treatment during solidification to achieve a uniform microstructure and improve its mechanical properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Xuefeng Ding, Wenhui Liu, Bo Jiang, Hu Qiang, Hao Huang, Mingyue Xiao, Yuqiang Chen, Yufeng Song
Summary: Through successive solution treatment, large pre-deformation of 50%, and aging process, the mechanical properties of the 7B52 laminated aluminum alloy were significantly improved. The effects of large pre-deformation on the microstructural evolution and mechanical behavior were examined, with the introduction of dislocations and low-angle grain boundaries being beneficial for precipitation strengthening. The 7A62 alloy exhibited higher strength increments due to its finer grain size, higher dislocation density, and larger number density of precipitates.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Engineering, Civil
A. Palanisamy, N. Jeyaprakash, V. Sivabharathi, S. Sivasankaran
Summary: The study focused on heat treatment of Incoloy 800H superalloy and analyzed its mechanical and tribological behavior. The air-cooled sample showed better performance with higher hardness and wear resistance compared to the as-received and furnace-cooled samples.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2021)
Article
Nanoscience & Nanotechnology
Ming-Song Chen, Quan Chen, Yu-Min Lou, Y. C. Lin, Hong-Bin Li, Yan-Yong Ma, Guan-Qiang Wang
Summary: The novel double-stage heat treatment method can effectively refine and homogenize the deformed coarse grains, enhancing the hardness and strength of the GH4169 alloy. Among the CRT parameters, the initial temperature has a significant impact on the grain size, while the hardness and strength are mainly influenced by the average grain size.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Physical
Kai Chang, Liang Ma, Pengting Li, Jun Lv, Xiaogang You, Yingwei Zhang, Yi Tan
Summary: In this study, the effect of heat treatment on the microstructures and mechanical properties of GH4099 superalloy fabricated by selective laser melting (SLM) was investigated. The results showed that heat treatment can significantly improve the microstructures and mechanical properties of the alloy, leading to enhanced tensile properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Hang Yu, Kezhi Li, Jinhua Lu
Summary: This study aims to select suitable carbon fibers as reinforcement material for carbon/carbon composites. Needle carbon fiber felt preforms were fabricated using T300 carbon fibers and TZ300 carbon fibers. Deposited carbon/carbon composites were prepared and the mechanical properties were comparatively investigated. The results show that the high-temperature properties of TZ300 carbon fiber are inferior to T300 carbon fiber.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Nanoscience & Nanotechnology
Tao Wang, Xueyang Fang, Wenjie Lv, Huiyun Zhang, Yi Luo, Liuwei Zheng, Wei Liang
Summary: This study characterizes the change of fracture morphology and microstructure of hot-rolled AISI430 ferritic stainless steels (FSSs) specimens after traditional electrochemical hydrogen charging and annealing at different temperatures (720 degrees C-1060 degrees C) using scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD) technology. The influence of annealing temperature on hydrogen embrittlement sensitivity, hydrogen-induced mechanical property changes, and the transformation of microstructure on hydrogen-induced fracture mode were systematically illustrated. The results show that the hydrogen embrittlement susceptibility of FSSs increases significantly from the alpha single-phase region to the alpha+beta dual-phase region. The presence of intergranular carbides in the annealed specimens in the alpha single-phase region leads to high plasticity and improved yield strength after hydrogen charging, attributed to the change of the strain field around the intergranular carbide by hydrogen. The formation of crack holes in the annealed specimens in the alpha single-phase zone and the formation of quasi-cleavage (QC) + cleavage fracture (C) morphology in the annealed specimens in alpha+beta dual-phase zone are the result of the synergistic effect of hydrogen enhanced localized plasticity (HELP) and hydrogen enhanced decohesion (HEDE) mechanisms. Transgranular secondary cracks were observed near the fracture of the annealed specimen when the annealing temperature reached 940 degrees C.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Q. Ding, H. Bei, X. Wei, Y. F. Gao, Z. Zhang
Summary: GH3536 (Hastelloy X) superalloy, widely used in gas turbine hot parts, exhibits extraordinary cryogenic mechanical properties and shares similar deformation mechanisms with recently developed face-centered cubic medium/high-entropy alloys.
MATERIALS TODAY NANO
(2021)
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)