Article
Materials Science, Multidisciplinary
M. Paghandeh, A. Zarei-Hanzaki, H. R. Abedi, Y. Vahidshad
Summary: The study investigates the strain accommodation mechanism of Ti-6Al-4V alloy with different initial microstructures under warm temperature deformation regime. Tensile tests were conducted at various temperatures, revealing different material behaviors and strain accommodation mechanisms in equiaxed alpha+beta, lamellar alpha+beta, dual phase alpha+alpha, and fully alpha martensite microstructures. The results provide insights into the relationship between microstructure, strain accommodation capability, and tensile formability.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Materials Science, Multidisciplinary
In-Su Kim, Jeong Mok Oh, Sang Won Lee, Jong-Taek Yeom, Jae-Keun Hong, Chan Hee Park, Taekyung Lee
Summary: This study investigated the effects of processing variables on the globularization of AM-processed Ti-6Al-4V alloy, revealing that a combination of solution treatment, low-temperature forging, and subsequent annealing significantly accelerates the process by reducing the path for boundary splitting in fine martensitic laths induced via solution treatment.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Materials Science, Multidisciplinary
Qian Wang, Margaux Saint Jalme, Christophe Schuman, Jean-Sebastien Lecomte, Christophe Desrayaud, Julien Favre, Damien Fabregue, Sylvain Dancette, Florian Mercier, Etienne Archaud, Christian Dumont
Summary: In this study, a denoising method using smoothing spline was proposed to reconstruct parent beta grain of titanium alloys. Additionally, the globularization mechanism under multi-axial hot compression was analyzed, showing that high globularized efficiency around 71.2% can be easily achieved by multi-directional deformation.
MATERIALS & DESIGN
(2021)
Article
Materials Science, Multidisciplinary
Bruna Callegari, Joao Pedro Oliveira, Rodrigo Santiago Coelho, Pedro Paiva Brito, Norbert Schell, Flavio Soldera, Frank Mueklich, Haroldo Cavalcanti Pinto
Summary: Microstructural and crystallographic changes of a Ti-6Al-4V alloy during thermomechanical processing in beta and alpha+beta phase fields were investigated. It was found that deformation in the single beta field leads to an increase in retained beta phase content and a decrease in martensitic c/a ratio with reduced strain rate. In the alpha+beta field, texture weakening and randomization were observed, with globularization taking place through dynamic recrystallization, boundary splitting, and shearing. The decrease in strain rate in the alpha+beta field results in larger globularized grain size and a closer c/a ratio of alpha phase to the ideal value for titanium.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Jianan Hu, Jiahua Zhang, Ya Wei, Hao Chen, Yi Yang, Songquan Wu, Dmytro Kovalchuk, Enquan Liang, Xi Zhang, Hao Wang, Aijun Huang
Summary: Different post-heat treatments were conducted on the CAEBWAMed Ti-6Al-4V alloy to understand the microstructure evolution, leading to the decomposition of α' martensite into α+β phase, increased ductility, and decreased strength.
Article
Materials Science, Multidisciplinary
J. Chen, D. Fabijanic, M. Brandt, Y. Zhao, S. B. Ren, W. Xu
Summary: This study demonstrates the development of a near-equiaxed α microstructure in situ via dynamic globularization in the as-built state of LPBF Ti-6Al-4V for the first time. The globularization process during LPBF is governed by mechanisms such as sub-grain boundary formation, boundary splitting, thermal grooving, lamellar termination migration and epitaxial growth. These findings provide new knowledge towards a holistic microstructural control strategy in additively manufactured Ti-6Al-4V.
Article
Crystallography
Junzhou Yang, Jianjun Wu
Summary: This study investigated the flow behavior and deformation mechanism of Ti-6Al-4V alloy during superplastic deformation process by conducting constant strain rate tensile tests. It found significant grain rearrangement and rotation in deformed samples. The proposed grain rotation accommodated grain boundary sliding deformation mechanism explains the texture evolution without grain deformation.
Article
Materials Science, Multidisciplinary
Geonhyeong Kim, Taekyung Lee, Seyed Amir Arsalan Shams, Jae Nam Kim, Seong Woo Choi, Jae Keun Hong, Chong Soo Lee
Summary: This study developed a heterogeneous-structured (HS) Ti-6Al-4V alloy composed of coarse and fine grains to enhance mechanical properties. The HS alloy had higher strength and better resistance to low-cycle fatigue compared to a commercial mill-annealed coarse-grained (CG) alloy, while also maintaining ductility. It offered an engineering advantage of low-cost mass production compared to an ultrafine-grained (UFG) counterpart. The enhanced mechanical properties of the HS alloy were attributed to the presence of an ultrafine-grained region and partial transformation of texture.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Chao Liu, Xin Wang, Ge Zhou, Feng Li, Siqian Zhang, Haoyu Zhang, Lijia Chen, Haijian Liu
Summary: The study investigated the superplastic tension and deformation mechanism of Ti-6Al-4V alloy at different tensile speeds, predicting the low-temperature superplastic deformation mechanism through theoretical modeling. It was found that dislocation movement controlled the superplastic tension of this alloy, and with increasing strain rate, the deformation mechanism transitioned from dislocation-controlled to dislocation glide mechanism.
FRONTIERS IN MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Polina Metalnikov, Dan Eliezer, Guy Ben-Hamu
Summary: This study found that the susceptibility to hydrogen embrittlement (HE) differs significantly between Ti?6Al?4V alloys prepared by selective laser melting (SLM) and electron beam melting (EBM). The degradation of SLM Ti?6Al?4V in a hydrogen containing environment is likely to occur through hydride formation and cleavage mechanism, while Ti?6Al?4V prepared by EBM is more likely to degrade through hydrogen enhanced localized plasticity (HELP) mechanism.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Chemistry, Physical
Zhuohan Cao, Qian Liu, Qianchu Liu, Xiaobo Yu, Jamie J. Kruzic, Xiaopeng Li
Summary: This study develops a machine learning-based approach using image data to predict and reconstruct the microstructural features of LPBF fabricated Ti-6Al-4V alloy. The results show that the proposed method can accurately predict the microstructural features under different process parameters, offering potential applications in process optimization and material design in additive manufacturing.
NPJ COMPUTATIONAL MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Yusen Xiao, Liang Lan, Shuang Gao, Bo He, Yonghua Rong
Summary: The present work investigates the effects of post-processes, specifically annealing at 800 degrees C and 950 degrees C, on the performance of selective laser melted Ti-6Al-4V alloy. The research shows that the ductility of the alloy can be significantly improved through annealing, particularly at 950 degrees C, where globularization occurs and alters the fracture mode. This globularization inhibits intergranular fracture and effectively suppresses crack initiation and propagation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
M. Paghandeh, A. Zarei-Hanzaki, H. R. Abedi, Y. Vahidshad
Summary: In this study, two different initial microstructures of Ti-6Al-4V alloy were deformed in tensile mode at warm temperatures of 300 degrees C and 600 degrees C. It was found that a bimodal/trimodal microstructure emerged during the thermomechanical processing of the dual phase alpha+square at 600 degrees C, resulting in a balance between strength and ductility. The lower ductility of full square martensite compared to dual phase alpha+square microstructure was attributed to the lower extent of involved strain accommodation mechanisms and absence of load transition mechanism.
Article
Materials Science, Multidisciplinary
C. L. Jia, L. H. Wu, P. Xue, D. R. Ni, B. L. Xiao, Z. Y. Ma
Summary: Structural integration is a critical developing direction in the aerospace field. A combination process of friction stir welding, static annealing, and superplastic deformation was proposed to eliminate strain localization during the fabrication of large-scale complex components. The study showed that a fully fine lamellar structure obtained through friction stir welding and the annealing process allowed for uniform superplastic deformation in the entire joint. The microstructures in the base material and the nugget zone tended to become similar equiaxed structures after deformation.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Atasi Ghosh, Vivek Kumar Sahu, Nilesh Prakash Gurao
Summary: The ratcheting behavior of additively manufactured and thermo-mechanically treated Ti-6Al-4V alloy was investigated. The as-built additively manufactured sample showed a lower fatigue life compared to the thermo-mechanically treated sample, and this decreased further after heat treatment. The combined hardening model in the Finite Element Method could not accurately predict the macroscopic stress-strain behavior of the additively manufactured alloy due to the heterogeneous evolution of microscopic strain. The presence of multi-variant needle-shaped martensite was found to increase crack propagation resistance and fatigue life in the as-built additively manufactured alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Kyungmin Noh, Seyed Amir Arsalan Shams, Wooyeol Kim, Jae Nam Kim, Chong Soo Lee
Summary: The study aimed to analyze the effects of microstructure on the resistance of low-carbon steels to low-cycle fatigue and extremely low-cycle fatigue (ELCF). Different microstructures showed different fatigue resistance properties, with ferrite-pearlite performing best in ELCF resistance and ferrite-bainite-martensite exhibiting higher ELCF resistance when considering tensile strength.
METALS AND MATERIALS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Kitae Kwon, Gyeonghyeon Fang, Wooyeol Kim, Sangho Uhm, Taekyung Lee, Chong Soo Lee
Summary: Type-C liquid metal embrittlement (LME) cracks affect the high-cycle fatigue resistance of TRIP steel joined using resistance spot welding (RSW), with varying impacts on tensile behavior in different deformation modes.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Nanoscience & Nanotechnology
Gyeonghyeon Jang, Jae Nam Kim, Hakhyeon Lee, Taekyung Lee, Nariman Enikeev, Marina Abramova, Ruslan Z. Valiev, Hyoung Seop Kim, Chong Soo Lee
Summary: This study investigated the microstructural evolution and mechanical properties of Fe-Mn-Al-C steel with varying shear strain imposed by high-pressure torsion (HPT). Different initial grain sized steels were used, and it was found that an inverse Hall-Petch relation softening phenomenon occurred in the finest grained steel with the highest number of revolutions (10R) of HPT.TEM observation showed the absence of deformation twins and the formation of numerous tilt/twist nanocrystalline boundaries which may explain the softening behavior in this regime.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Correction
Multidisciplinary Sciences
Nhung Thi-Cam Nguyen, Peyman Asghari-Rad, Praveen Sathiyamoorthi, Alireza Zargaran, Chong Soo Lee, Hyoung Seop Kim
NATURE COMMUNICATIONS
(2022)
Article
Biotechnology & Applied Microbiology
Jin-Woo Park, Yusuke Tsutsumi, Eui-Kyun Park
Summary: This study investigated the effects of manganese (Mn) ion modification on the surface of titanium (Ti) implants. The results showed that the incorporation of Mn enhanced the corrosion resistance and osteogenic capacity of the Ti implants. The findings suggest that Mn modification is an effective approach to improve the osseointegration of Ti implants.
BIOMED RESEARCH INTERNATIONAL
(2022)
Article
Engineering, Biomedical
Jin-Woo Park, Ji-Hun Seo, Heon-Jin Lee
Summary: This study investigated the effects of surface chemistry modification using lithium ions on the osteogenesis-related cell functions of osteoprogenitor cells. The results showed that the lithium-modified surface enhanced cellular events and accelerated osteogenic differentiation, leading to a more favorable osseointegration outcome.
JOURNAL OF BIOMATERIALS APPLICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Seyed Amir Arsalan Shams, Jae Wung Bae, Jae Nam Kim, Hyoung Seop Kim, Taekyung Lee, Chong Soo Lee
Summary: This study investigated the deformation behaviors and microstructural evolutions of an interstitial metastable high-entropy alloy under monotonic and cyclic deformation modes. The presence of carbon and the appearance of deformation-induced epsilon-martensite were found to contribute to the superior combination of strength and ductility in the alloy. The microstructure of the alloy varied between coarse-grained and fine-grained depending on the deformation mode. The strain amplitude also influenced the fatigue life of the alloy.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Man Jae Sagong, Eun Seong Kim, Jeong Min Park, Gangaraju Manogna Karthik, Byeong-Joo Lee, Jung-Wook Cho, Chong Soo Lee, Takayoshi Nakano, Hyoung Seop Kim
Summary: Recently, direct energy deposition (DED) has gained attention in metal additive manufacturing for its ability to produce multi-materials and composition gradient materials with geometrical design freedom and high productivity. This study used DED processing to fabricate layered multi-materials of austenitic stainless steel (SS316L) and nickel-based superalloy (IN718). The resulting multi-materials exhibited a 500 μm thick composition gradient material zone (CGZ) at the SS316L/IN718 interface due to dilution. Fine cracks containing brittle phases were observed in the CGZ closer to the SS316L side. Despite the cracks, the multi-material samples showed higher yield strength and ultimate tensile strength than those predicted by rule-of-mixtures, attributed to hetero-deformation-induced hardening near the CGZ.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Seyed Amir Arsalan Shams, Gyeonghyeon Jang, Jae Wung Bae, Auezhan Amanov, Hyoung Seop Kim, Taekyung Lee, Chong Soo Lee
Summary: The low-cycle fatigue life and cyclic deformation behavior of a metastable high-entropy alloy were investigated. The effects of ultrasonic nanocrystal surface modification (UNSM) process on tensile properties and fatigue life were evaluated. The study found that the fatigue life of the alloy was comparable to that of CoCrFeMnNi alloy, and mechanical twins in cyclic loads appeared only at high strain amplitudes. Additionally, while the UNSM process increased the yield strength of the alloy, it also accelerated fatigue crack initiation and degraded fatigue crack growth resistance.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Engineering, Biomedical
Hyun-Wook An, Jaesik Lee, Jin-Woo Park
Summary: This study evaluated the surface characteristics and biocompatibility of surface-modified thin titanium foils for guided bone regeneration. The results showed that anodization and heat treatment produced a titanium dioxide structure with nanoscale protrusions, which enhanced the growth of gingival fibroblasts and osteoblast-like cells. Further heat treatment improved cell response and gene expression related to cell adhesion and osteoblast differentiation. However, the thin oxide coating obtained by a 30 min heat treatment showed poor clinical plasticity as a regenerative barrier membrane. These findings suggest that a specific thickness of anatase Ti oxide coating with nanoscale surface protrusions and hydrophilic characteristics can effectively promote the regeneration of both gingival tissue and bone.
JOURNAL OF BIOMATERIALS APPLICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Jang Woong Jo, Jae Nam Kim, Chong Soo Lee
Summary: This paper presents a method to increase the hydrogen-embrittlement resistance of martensite steel using partial phase transformation and tempering. The resulting dual-tempered martensitic (DTM) steel showed higher HE resistance and strength compared to conventional tempered martensite (TM) due to the presence of specific precipitates.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Geonhyeong Kim, Taekyung Lee, Seyed Amir Arsalan Shams, Jae Nam Kim, Seong Woo Choi, Jae Keun Hong, Chong Soo Lee
Summary: This study developed a heterogeneous-structured (HS) Ti-6Al-4V alloy composed of coarse and fine grains to enhance mechanical properties. The HS alloy had higher strength and better resistance to low-cycle fatigue compared to a commercial mill-annealed coarse-grained (CG) alloy, while also maintaining ductility. It offered an engineering advantage of low-cost mass production compared to an ultrafine-grained (UFG) counterpart. The enhanced mechanical properties of the HS alloy were attributed to the presence of an ultrafine-grained region and partial transformation of texture.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Nanoscience & Nanotechnology
Seyed Amir Arsalan Shams, Geonhyeong Kim, Chong Soo Lee, Hyoung Seop Kim, Hamid Reza Jafarian
Summary: The effect of Si content on the tensile and cyclic deformation behavior of Fe50-xMn30Co10Cr10Six (x = 0-6) as a metastable high-entropy alloy was studied. The tensile properties and deformation mechanisms were not significantly affected by Si content up to 4 at.%, but the cyclic deformation behavior was sensitive to Si content. The addition of Si facilitated the γ to ε-martensite phase transformation and resulted in fatigue lives of more than 10000 cycles at a strain amplitude of 0.7%.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Crystallography
Hamed Shahmir, Parham Saeedpour, Mohammad Sajad Mehranpour, Seyed Amir Arsalan Shams, Chong Soo Lee
Summary: One important issue in materials science is the balance between strength and ductility in engineering alloys, and creating heterogeneous and complex microstructures is an effective method to achieve this. In this study, a CoCrFeNiMn high-entropy alloy was processed through cold rolling and post-deformation annealing at temperatures ranging from 650-750 degrees C, resulting in a wide range of grain sizes. Annealing at 650 degrees C produced a heterogeneous structure with recrystallized areas of ultrafine and fine grains and non-recrystallized areas with an average size of around 75 μm. The processed material exhibited a combination of high strength (over 1 GPa) and uniform elongation (over 12%), which was attributed to different deformation mechanisms such as dislocation slip, deformation twinning, and hetero-deformation-induced hardening. Increasing the annealing temperature to 700 degrees C allowed for the acquisition of bimodal grain size distributions (around 1.5 and 6 μm), while annealing at higher temperatures eliminated the heterogeneous structure and led to a significant decrease in strength.
Article
Materials Science, Multidisciplinary
Minseob Kim, Seong Ho Lee, Jinyeong Yu, Seho Cheon, Sujeong Byun, Chong Soo Lee, Taekyung Lee
Summary: This study investigated the microstructural kinetics induced by electropulsing treatment (EPT) of Ti-6Al-4V alloy and found that EPT enhances several aspects of microstructural evolution, leading to improved mechanical performance.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
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)
