Article
Metallurgy & Metallurgical Engineering
Z. Z. Peng, X. H. Shao, Z. M. Liang, D. L. Wang, L. W. Wang, X. L. Ma
Summary: To optimize the mechanical properties of LPSO-containing Mg alloys, a Mg-Zn-Y-Zr alloy with intragranular and free grain boundary LPSO phases was successfully prepared by homogenization. The strengthening and toughening mechanisms were unraveled through transmission electron microscopy characterization and theoretical analysis, revealing the synergistic deformation mechanism of multiple kinking and twinning in the grains. The activation of kinking and twinning depended on the thicknesses of LPSO lamellae and their relative spacing, providing insights for optimizing the design of Mg alloys regulating the microstructure of LPSO phases.
JOURNAL OF MAGNESIUM AND ALLOYS
(2023)
Article
Multidisciplinary Sciences
Koji Inoue, Kenta Yoshida, Yasuyoshi Nagai, Kyosuke Kishida, Haruyuki Inui
Summary: APT and TEM/STEM were used correlatively to explore the atomic-scale local structure and chemistry changes during the growth of the LPSO phase in Mg-Al-Gd alloy. It was discovered that enrichment of Gd atoms precedes that of Al atoms, and the formation of Al6Gd8 clusters requires sufficient diffusion of Al atoms into the relevant portions. Lateral growth of the LPSO phase is believed to occur through a 'ledge' mechanism controlled by diffusion of Al atoms.
SCIENTIFIC REPORTS
(2021)
Article
Materials Science, Multidisciplinary
Pavel Cizek, Sitarama R. Kada, Jiangting Wang, Nicholas Armstrong, Ross A. Antoniou, Peter A. Lynch
Summary: The study revealed that in the early stage of cyclic deformation in a Ti-6Al-4V alloy, dislocation structures mainly occurred through dislocation glide, with no evidence of deformation twinning. Prismatic and basal slip were the dominant deformation modes in the alpha phase. Dislocations in the beta phase after deformation mainly displayed a large screw component.
MATERIALS CHARACTERIZATION
(2021)
Article
Nanoscience & Nanotechnology
Abhinav Parakh, Andrew C. Lee, Stella Chariton, Melody M. Wang, Mehrdad T. Kiani, Vitali B. Prakapenka, X. Wendy Gu
Summary: Precipitate-matrix interactions govern the mechanical behavior of precipitate strengthened Al-based alloys. We studied the high-pressure behavior of Al7075 alloy separately from the high strain-rate behavior. High pressure can significantly enhance the strength of the alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Qiang Yang, Shuhui Lv, Zixiang Yan, Xiru Hua, Xin Qiu, Jian Meng
Summary: This study reveals strong ductility asymmetry in extruded Mg alloys containing LPSO plates, which is mainly caused by deformation steps in LPSO plates, contributing significantly to compressive ductility. The results provide fundamental insights into deformation modes and mechanisms of thin LPSO plates, as well as a better understanding of the ductility asymmetry in extruded Mg alloys containing LPSO plates.
MATERIALS & DESIGN
(2021)
Article
Nanoscience & Nanotechnology
Xianbing Zhang, Weilin Wang, Jialin Wu, Shubin Wang, Jian Sun, Jing Yang Chung, Stephen J. Pennycook
Summary: This study designs a Ti48.9Zr32.0Nb12.6Ta6.5 MEA exhibiting {112}<111>(beta) twins at room temperature. The solution-treated (ST) samples show homogeneous chemical composition, good tensile properties, and no athermal phase. Microscopy reveals the interaction between twins and dislocations in the deformation of MEAs, contributing to work hardening.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
Lunchao Zhang, Yuan Yuan, Jun Wang, Tao Chen, Jingfeng Wang, Fusheng Pan
Summary: High temperature heat treatment Mg-0.69Sn-0.69Y alloy exhibited a high damping capacity (0.201 at epsilon=1 x 10-3) and a very low critical strain amplitude at room temperature (epsilon cr1=2.97 x 10-5), which can be ascribed to the combined effects of purified matrix phase and subgrain interfaces. The substructure is unstable and the damping capacity decreases with temperature increment.
SCRIPTA MATERIALIA
(2023)
Article
Nanoscience & Nanotechnology
Jin-Seob Kim, Jin-Kyung Kim
Summary: This study investigates the effect of initial microstructures on deformation mechanisms, damage resistance, and mechanical properties of the Fe50Mn30Co10Cr10 high entropy alloy. The results show that the material annealed at 600 degrees C has higher strength and good ductility, with a strain hardening rate affected by the simultaneous deformation accommodation from the FCC/HCP dual phase. The different microstructures significantly influence the deformation and damage mechanisms of the material, as well as the role of grain size and phase transformation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
M. R. Gazizov, A. N. Belyakov, R. Holmestad, M. Yu. Gazizova, V. S. Krasnikov, P. A. Bezborodova, R. O. Kaibyshev
Summary: The deformation behavior of {111}Al omega plates in an Al-Cu-Mg-Ag alloy was analyzed using atomic-resolution scanning transmission electron microscopy (STEM). The transition from particle shearing to Orowan dislocation loop formation was observed at critical plate thicknesses of 3 and 3.5 cθo (2.54-2.97 nm) when considering the omega phase as consisting of the orthorhombic theta lattice (θo). For thinner plates, a full dislocation allowed particle segments to shift relative to each other in planes orthogonal to the particle habit plane. Thicker plates exhibited dislocation loops consisting of two segments with jogs, causing particle segmentation and deviation from the Al/omega orientation relationship.
Article
Materials Science, Multidisciplinary
Shuai Yuan, Jinhui Wang, Lei Zhang, Shiyu Luan, Peipeng Jin
Summary: The presence of long-period stacking ordered (LPSO) phase can inhibit the activation and growth of twins in the alloy, as well as obstruct the movement of non-basal slip, resulting in improved mechanical properties.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Hidetoshi Somekawa, Michiaki Yamasaki, Yoshihito Kawamura, Tadanobu Inoue
Summary: By changing the insertion direction of the rolled billet, it is possible to control the area fraction of deformation kink bands, which can impact the mechanical properties of the alloy.
MATERIALS CHARACTERIZATION
(2021)
Article
Nanoscience & Nanotechnology
Yunhe Zheng, Laure Bourgeois, Jian-Feng Nie
Summary: This study investigated the structure of precipitates in Mg-Zn-Al alloys, revealing new structural features and proposing that the rod-shaped precipitates can be described by tiling of different shapes.
SCRIPTA MATERIALIA
(2021)
Article
Chemistry, Physical
Shuai Yuan, Jinhui Wang, Lei Zhang, Peipeng Jin
Summary: This study investigated the hot deformation behavior of a heat-treated Mg-12Y-1Al alloy containing long-period stacking ordered (LPSO) phase through uniaxial compression experiments. The flow stress decreased with increasing temperature and decreasing strain rate. Dynamic recrystallization (DRX) was promoted by higher temperatures. The main DRX mechanism observed was discontinuous dynamic recrystallization (DDRX), while the dense lamellar LPSO at the grain boundary hindered DDRX. The deformed microstructure showed a typical [0001]//CD texture, and its intensity decreased with increasing temperature due to multiple slip systems activation and increased DRX fraction.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Kang Wei, Rong Hu, Dongdi Yin, Lirong Xiao, Song Pang, Yang Cao, Hao Zhou, Yonghao Zhao, Yuntian Zhu
Summary: The refinement of magnesium grains can enhance both its strength and ductility due to the activation of additional slip systems. Fine-grained magnesium exhibits improved work hardening and ductility compared to coarse-grained magnesium, with the activation of non-basal dislocations playing a key role in enhancing properties. The contributions of nano stacking faults on strengthening and ductilization, as well as their formation mechanism, are discussed in the study.
Article
Materials Science, Multidisciplinary
Kaiju Lu, Ankur Chauhan, Dimitri Litvinov, Mike Schneider, Guillaume Laplanche, Jarir Aktaa
Summary: The fatigue deformation mechanisms of low-SFE MPEAs include the formation of slip bands and veins/walls/cells, which explains their outstanding damage tolerance.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
Article
Materials Science, Multidisciplinary
Bijin Zhou, Leyun Wang, Jinhui Wang, Alireza Maldar, Gaoming Zhu, Hailong Jia, Peipeng Jin, Xiaoqin Zeng, Yanjun Li
Summary: The dislocation behavior of Mg-5Y alloy during tensile deformation was quantitatively studied using in-situ tensile test, VPSC modeling, and TEM. Results showed that <a> dislocations were the primary contributors to deformation, with a small fraction of <c+a> dislocations activated near grain boundaries. The alloy exhibited a lower CRSS ratio and high ductility, attributed to the mobility of <c+a> dislocations.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Wenke Zhou, Zixin Li, Dejiang Li, Ming Qin, Xiaoqin Zeng
Summary: The effect of cooling rate on microstructure evolution of Mg-4La-2.5Al-0.3Mn (LA42) Mg alloy was investigated. High-pressure die casting (HPDC) LA42 alloy exhibited small grain size and undeveloped dendritic structure compared to permanent gravity casting (PGC) LA42 alloy. The eutectic morphology and growth characteristics differed between the two casting methods. The cooling rate influenced the eutectic lamellar spacing in the HPDC LA42 alloy through changes in nucleation and growth velocity.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
M. Freund, D. Andre, P. L. Sun, C. F. Kusche, S. Sandloebes-Haut, H. Springer, S. Korte-Kerzel
Summary: The room temperature plasticity of the cubic C15 CaAl2 Laves phase was studied using nanomechanical testing and electron microscopy. Slip on {111} and {112} planes was found to be most favorable for all crystallographic orientations, while cracks predominantly occurred on {112} planes. The determined critical resolved shear stresses for {111}<11 0 > and {112}<11 0 > slip were 0.99 +/- 0.03 GPa and 0.97 +/- 0.07 GPa, respectively.
MATERIALS & DESIGN
(2023)
Article
Nanoscience & Nanotechnology
S. S. Dash, D. J. Li, X. Q. Zeng, D. Y. Li, D. L. Chen
Summary: In this study, the micro-deformation mechanisms in an Al-Si cast alloy under stepwise compressive loading were investigated using EBSD and slip trace analyses. The presence of heterogeneous microstructural features significantly influenced the slip trace characteristics. Four types of slip traces in primary α-Al grains were identified, revealing the nature of dislocation motion and the extent of deformation difficulty associated with grain orientations and eutectic Si particles. Crystallographic factors were analyzed to understand the deformation behavior of the alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Nanoscience & Nanotechnology
S. S. Dash, D. J. Li, X. Q. Zeng, D. Y. Li, D. L. Chen
Summary: The aim of this study is to investigate the monotonic and cyclic deformation behavior of a high-pressure die cast Silafont (R)-36 alloy in a naturally-aged T4 state. The T4 heat treatment led to significant microstructural changes, resulting in the transformation of coralloid-like eutectic Si particles to spheroidal Si particles embedded in the Al matrix. The T4 alloy exhibited strong cyclic hardening and a longer low cycle fatigue life compared to its as-cast state at lower strain amplitudes, attributed to particle-dislocation interactions during deformation. A strain energy density-based model incorporating microstructural aspects can be used to predict the fatigue life of the T4 alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Correction
Chemistry, Physical
Martin Heller, Anett Stocker, Rudolf Kawalla, Nora Leuning, Kay Hameyer, Xuefei Wei, Gerhard Hirt, Lucas Boehm, Wolfram Volk, Sandra Korte-Kerzel
Article
Materials Science, Multidisciplinary
Quan Li, Mingyu Gong, Jiancheng Jiang, Yiwen Chen, Houyu Ma, Yujuan Wu, Yongxiang Hu, Yue Liu, Guisen Liu, Jian Wang, Xiaoqin Zeng
Summary: We quantitatively measured the twinning shear of three twinning modes at an atomic level, allowing us to determine the character of elementary twinning dislocation. These findings not only clarify the twinning mechanisms but also provide a method to determine other complex shear mechanisms at an atomic level.
Article
Materials Science, Multidisciplinary
Mattis Seehaus, Sandra Korte-Kerzel, Stefanie Sandloebes-Haut
Summary: The effect of silicon on the microstructure and carbon distribution in martensitic steels is investigated in this study. It is found that silicon forms a sigmoidal distribution at the phase boundary, acting as a barrier for carbon segregation. The addition of silicon inhibits carbide formation and reduces carbon partitioning into the austenite phase.
MATERIALS & DESIGN
(2023)
Article
Materials Science, Multidisciplinary
Fanjin Yao, Dejiang Li, Zixin Li, Bo Hu, Yu Huang, Xiaoqin Zeng
Summary: Alloying can deteriorate the thermal conductivity of pure metals, and composite materials are the inevitable choice to optimize the thermal conductivity of alloys. Multiwalled carbon nanotubes (MWCNTs) were used to achieve Mg-based composites with ultra-high thermal conductivity surpassing pure Mg, optimized mechanical properties, and superior lightweight. The thermal conductivity of the Mg-4Sm-2Al (SA42) matrix composites dramatically surpassed pure Mg by introducing 2 vol% MWCNTs. The addition of MWCNTs improved the yield strength, ultimate tensile strength, and elongation of the composites. The thermal conductivity and mechanical properties were studied through thermal conductivity models and microstructures. These findings provide new insights for designing composites with superior thermal conductivity surpassing the pure matrix and exhibiting an integrated structure-function.
Article
Nanoscience & Nanotechnology
Risheng Pei, Zhuocheng Xie, Sangbong Yi, Sandra Korte-Kerzel, Julien Guenole, Talal Al-Samman
Summary: Solute segregation at grain boundaries in magnesium alloys with multiple substitutional elements has a strong impact on various material characteristics. This study investigates the compositional inhomogeneity of six different grain boundaries using experimental and simulation techniques. The results reveal that the solute concentration of Nd in Mg varies between 2 and 5 at.%, and this variation is observed for different grain boundary orientations and within the grain boundary plane. Correlated atomistic simulations suggest that this inhomogeneous segregation behavior is caused by local atomic rearrangements within the grain boundaries.
SCRIPTA MATERIALIA
(2023)
Article
Materials Science, Multidisciplinary
Wassilios J. Delis, Lukas Berners, Sandra Korte-Kerzel, Stefanie Sandloebes-Haut
Summary: Compared to pure Mg, lean alloyed Mg-Al-Ca alloys exhibit weakened basal-type texture intensities and increased room-temperature ductility. In this study, the combined effects of Al and Ca on texture evolution were investigated by subjecting two binary and seven ternary Mg-Al-Ca alloys to cold rolling, with texture measurement after each rolling step. The results showed that the addition of Ca weakens the basal-type texture of Mg, while the addition of Al strengthens it compared to the samples containing Ca. The joint effect of Al and Ca can lead to a steady-state basal texture intensity for specific alloy compositions. The solubility limit of Ca in Mg is expected to influence this behavior. Mechanical properties obtained by compression testing exhibited high degrees of deformation, ranging from 15-25%.
Article
Crystallography
Mattis Seehaus, Risheng Pei, Sandra Korte-Kerzel, Stefanie Sandloebes-Haut
Summary: The determination of orientation relationships in dual or multi-phase materials is crucial for designing materials with specific properties in the field of interface engineering. This study developed a code for automated and statistical analysis of orientation relationships in electron backscatter diffraction data. The code was applied to Fe-Ni-(Si)-C alloys with lenticular martensite and retained austenite, and it successfully identified the Greninger-Troiano orientation relationship. The code proved to be feasible for statistically reliable investigation of the orientation relationship between retained austenite and related martensite variants.
Article
Materials Science, Multidisciplinary
Zhuocheng Xie, Dimitri Chauraud, Achraf Atila, Erik Bitzek, Sandra Korte-Kerzel, Julien Guenole
Summary: Using atomistic simulations, this study investigates the atomic-scale mechanisms of motion of zonal dislocations in Laves phases. Two types of synchro-Shockley dislocations with different properties are identified, and it is demonstrated that the nucleation and propagation of kink pairs are energetically favorable for their motion. The roles of vacancy hopping, interstitial shuffling, and nonsequential atomic shuffling are also investigated, providing insights into the plastic deformation induced by zonal dislocations and related phases.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
N. Leuning, M. Heller, M. Jaeger, S. Korte-Kerzel, K. Hameyer
Summary: This paper presents a miniaturized Single Sheet Tester for characterizing industrial steel sheets and limited size single, bi- and oligocrystals. The measurement of global magnetic properties is coupled with microstructural analysis methods to investigate micro scale magnetic effects. A correction function is introduced to allow quantitative comparisons between differently sized Single Sheet Testers.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Zhuocheng Xie, Dimitri Chauraud, Achraf Atila, Erik Bitzek, Sandra Korte-Kerzel, Julien Guenole
Summary: Synchro-Shockley dislocations, as zonal dislocation, play a crucial role in the plasticity of Laves phases at high temperatures. The motion of these dislocations involves localized transition events, and their activation volumes contribute to the temperature and strain rate sensitivity of the Peierls stress. However, the thermally activated behavior of synchro-Shockley dislocation motion is not well understood. This study investigates the transition mechanisms of these dislocations at different shear and normal strain levels, and reveals that the motion of synchro-Shockley dislocations is sensitive to shear, but requires thermal assistance for shear-insensitive events, indicating their inhibition at low temperatures.
SCRIPTA MATERIALIA
(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)
