Article
Materials Science, Multidisciplinary
Lixia Ma, Min Wan, Weidong Li, Jie Shao, Xiaoning Han, Jichun Zhang
Summary: This study systematically investigated the superplastic deformation microstructure evolution and mechanism of the new near-alpha TNW700 titanium alloy at different strain rates and true strains. Results showed that the alloy exhibited excellent superplastic behavior within a certain strain rate range, with decreasing peak stress and significant strain hardening followed by flow softening. Electron backscatter diffraction and high resolution transmission electron microscopy were used to characterize the microstructure.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Yang Liu, Zhiqiang Li, Bing Zhao, Chaoyang Sun, Yinghao Feng
Summary: The superplastic microstructure evolution and deformation behavior of rolled near-alpha TA32 titanium alloy were investigated. The alloy exhibited exceptional superplastic deformability with maximum elongation near 900% and flow stress sensitivity to temperature and strain rate. The flow softening process was mainly controlled by continuous dynamic recrystallization (CDRX) and dynamic recovery (DRV) mechanisms. The main deformation mechanism was the relative sliding of grains along high-angle grain boundaries (HAGBs) coordinated by dislocation motion, grain rotation, and dynamic recrystallization (DRX).
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
A. Mikhaylovskaya, A. O. Mosleh, P. Mestre-Rinn, A. D. Kotov, M. N. Sitkina, A. Bazlov, D. Louzguine-Luzgin
Summary: This study demonstrates that the additions of Fe and B significantly improve microstructural homogeneity and superplastic performance of a Ti-Al-Mo-V alloy, lowering its superplastic deformation temperature. The modified alloy shows excellent superplastic deformation behavior with high strength and elongation-to-failure, making it an attractive material for complex parts in various advanced applications.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2021)
Article
Crystallography
Xiaoning Han, Junzhou Yang, Jinshan Li, Jianjun Wu
Summary: The flow behavior of Ti-6Al-4V alloy during the air-cooling process after superplastic forming is discussed. The optimized deformation temperatures and strain rates are identified, and the effects of activation energy, deformation strain, and dislocation density on flow behavior are explored. In addition, unstable flow is mainly caused by dynamic recrystallization, and the material gradually experiences damage during the air-cooling process.
Article
Metallurgy & Metallurgical Engineering
S. Taylor, G. D. West, E. Mogire, F. Tang, H. R. Kotadia
Summary: The study investigated the suitability of a hot-rolled AZ41 magnesium alloy for superplastic forming process and established optimal forming parameters. The results showed excellent formability at specific temperatures and strain rates, with dynamic recrystallization playing a key role in the material's formability. Peak elongation of 520% was achieved, demonstrating the industrial relevance of the alloy in superplastic forming.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2021)
Article
Materials Science, Multidisciplinary
X. X. Wang, T. Liu, R. X. Zhang, H. J. Jin, X. N. Zhao, W. H. Wu, J. Cheng
Summary: This study investigates the static recrystallization (SRX) responsible for texture development in the annealing of TA15 flow-formed parts. The results show that SRX grains are produced by both discontinuous (DSRX) and continuous (CSRX) mechanisms, with the dominant mechanism depending on the pre-deformation and annealing conditions. The occurrence of DSRX and CSRX-DILS has a minor effect on the global annealing texture type but weakens its concentration. The growth rate of CSRX grains primarily affects the texture intensity, with higher misorientation angles accelerating the growth and resulting in a stronger global texture.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Chemistry, Physical
Ning Tian, Wenjun Ye, Xiaoyun Song, Songxiao Hui
Summary: The SP700 titanium alloy exhibited excellent superplasticity with fine grain size and increased volume fraction of the beta phase as strain increased. The beta-stabilizing elements were mainly dissolved within the beta phase and diffused from alpha to beta phase during deformation. The increase in strain led to the accumulation of dislocations and an increase in the proportion of low angle grain boundaries.
Article
Nanoscience & Nanotechnology
L. da Silva, G. Sivaswamy, L. Sun, S. Rahimi
Summary: The study found that Ti-6Al-4V alloy exhibits crystallographic texture-dependent anisotropic flow behavior at 750 degrees C, but isotropic deformation at 900 degrees C. At lower temperatures, the presence of banded microstructure was identified as the main reason for anisotropy, while Rachinger grain boundary sliding was the dominant deformation mechanism at higher temperatures.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Engineering, Manufacturing
Zhihao Du, Chunxu Wang, Qing Liu, Shan Wang, Yang Liu, Guofeng Wang
Summary: The SPF/DB process was used to fabricate a hollow structure with stiffeners using TA7 titanium alloy. Tensile behavior and shear strength of the alloy in diffusion bonding experiments were investigated. Results showed high elongation and shear strength, indicating the effectiveness of the DB/SPF process.
JOURNAL OF MANUFACTURING PROCESSES
(2022)
Article
Engineering, Mechanical
Shan Shi, Qinghua Deng, Hang Zhang, Liang Feng, Xiangjun Xu, Jie Ding, Hui Chang, Lian Zhou
Summary: With increasing total strain amplitudes, the Ti-6Al-4V-0.55Fe alloy showed softening behavior and more plastic deformation during cyclic loading. Additionally, phase transformation and recrystallization occurred under high stress amplitudes, leading to crack propagation along grain boundaries and lamellar interfaces.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Chemistry, Physical
Yangbo Yu, Hongge Yan, Jihua Chen, Weijun Xia, Bin Su, Tian Ding, Zhenzhen Li, Min Song
Summary: The flow behavior and dynamic transformation of near beta TC17 alloy with a bimodal structure were studied using hot compression. The results showed that discontinuous yielding and post strain hardening were most pronounced at 840°C-20 s-1. High strain rate slightly promoted dynamic transformation at 840°C and 870°C, while more dramatic dynamic transformation occurred at 900°C and 1 s-1.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
Lixia Ma, Min Wan, Weidong Li, Jie Shao, Xuepiao Bai, Jichun Zhang
Summary: Research on the high temperature titanium alloy TNW700 revealed significant work hardening behavior, with varying trends in work hardening coefficient and critical strain between flow hardening and softening with respect to strain rate and deformation temperature. The alloy showed excellent superplasticity at 900-950 degrees C but poor superplasticity at 975 degrees C. The study on superplasticity is crucial for optimizing the forming process of the alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Zhenni Lei, Pengfei Gao, Xianxian Wang, Mei Zhan, Hongwei Li
Summary: This study investigates the anisotropy of mechanical properties in titanium alloy tube components formed by hot flow forming. It reveals the differences in deformation mechanisms and fracture behaviors under different loading directions, and quantifies the characteristics of the property anisotropy. The results suggest that optimizing the texture and microstructure is critical to reduce the differences in slip, damage and fracture behavior along different directions and improve the service performance of the titanium alloy tube.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Metallurgy & Metallurgical Engineering
Jun-zhou Yang, Jian-jun Wu, Hai-nan Xie, Zhi-guo LI, Kai-wei Wang
Summary: This study investigated the continuous dynamic recrystallization (CDRX) mechanism of Ti-6Al-4V alloys during superplastic forming (SPF) to understand the dominant mechanism for different misorientation evolution processes. Tensile tests were conducted at 890, 920, and 950 degrees C with a strain rate range of 10-4-10-2 s-1, and electron back-scattered diffraction (EBSD) observations and a constitutive model were used to describe the microstructure evolution. The results showed that geometrically necessary dislocations (GNDs) were responsible for the evolution of low angle grain boundaries (LAGBs). Furthermore, the mechanism of transformation from LAGBs to high angle grain boundaries (HAGBs) involved migration, remaining dislocations, and sub-grain rotation.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2023)
Article
Materials Science, Multidisciplinary
Abdul Malik, Yangwei Wang, Cheng Huanwu, Tahir Mehmood Bhatti, Faisal Nazeer
Summary: The study investigated the superplasticity of fine-grained extruded ZK61 magnesium alloy at elevated temperatures, showing high elongation to fracture and a governing deformation mechanism of intra-granular slip.
RESULTS IN PHYSICS
(2021)
Article
Automation & Control Systems
Xi Wang, Qi Rong, Zhusheng Shi, Jianguo Lin
Summary: In this study, a closed-form solution for predicting springback in creep age forming (CAF) was developed based on the beam theory and Winkler's theory. An efficient compensation method was proposed and validated through finite element simulation and experimental tests. The proposed method, combined with the closed-form solution, successfully achieved the target shape within reasonable iterations for complex flexible tool CAF.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Wei Wang, Daniel S. Balint, Amir A. Shirzadi, Yaping Wang, Junyi Lee, Lee Aucott, Jun Jiang
Summary: Understanding the interaction between micro-voids and grain boundaries is crucial for improving the mechanical properties of safety-critical parts. By achieving grain boundary migration across voids, we demonstrate the beneficial effects on mechanical properties. The study used in-situ EBSD/FSE and crystal plasticity finite element modeling to investigate the micromechanisms and quantitative analysis of grain boundary migration on local deformation.
Review
Materials Science, Multidisciplinary
Emad Scharifi, Victoria A. Yardley, Ursula Weidig, Damian Szegda, Jianguo Lin, Kurt Steinhoff
Summary: In the past decade, aluminum alloys have become important structural materials in the automotive industry due to their advantageous properties. However, their poor formability at room temperature poses a challenge. This article provides an overview of recent developments in forming processes for aluminum alloys, including new techniques that show promise in improving formability. It also discusses the influence of process parameters on microstructures and mechanical properties.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Qiang Zhang, Minhui Yuan, Kaikai Pang, Yuyou Zhang, Ruoyu Wang, Xiaojian Tan, Gang Wu, Haoyang Hu, Jiehua Wu, Peng Sun, Guo-Qiang Liu, Jun Jiang
Summary: In this study, an effective method was reported to improve the low thermoelectric efficiency of p-type (Bi,Sb)2Te3 by incorporating Ag8GeTe6 and Se. The addition of Ag and Ge atoms optimized the carrier concentration and effective mass, while the Sb-rich nanoprecipitates formed coherent interfaces with little loss of carrier mobility. The subsequent Se doping introduced multiple phonon scattering sources and significantly suppressed the lattice thermal conductivity. The optimized sample achieved a high peak ZT of 1.53 at 350 K and a remarkable average ZT of 1.31 (300-500 K), with an extraordinary conversion efficiency of 6.3% at Delta T = 245 K for the constructed TE module.
ADVANCED MATERIALS
(2023)
Article
Automation & Control Systems
Zhe Zhang, Wenbin Zhou, Zhusheng Shi, Jianguo Lin
Summary: In this paper, a comparative study was conducted to investigate the metal flow behavior, extrusion force, welding quality, and billet material utilization of wide stiffened aluminium panels manufactured using multi-container extrusion with different die designs. The modified design resulted in better metal flow, more uniform extrusion force, and improved welding quality compared to the initial design. Extrusion speed had a minor effect on welding quality. The most notable feature was that the modified design greatly improved material utilization, saving 39.5% of material compared to the initial design.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Engineering, Industrial
Fengzhen Sun, Pavel Penchev, Catalin I. Pruncu, Junjie Wang, Chris Pargeter, Yaping Wang, Chang Li, Stefan Dimov, Jun Jiang, Bamber R. K. Blackman
Summary: This study investigates the influence of surface micropatterns on the fracture behavior of adhesively bonded interfaces. Results show that laser patterning can enhance the fracture resistance by modifying surface roughness, wettability, and chemistry. The uniformity of patterning across the surfaces and the effective patterning ratio are found to be crucial factors. Local plastic deformation in the adhesive at the patterned structures is identified as one toughening mechanism.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2023)
Article
Chemistry, Physical
Longbing Yi, Haowei Xu, Haibing Yang, Shaolin Huang, Hao Yang, Yanan Li, Qiang Zhang, Zhe Guo, Haoyang Hu, Peng Sun, Xiaojian Tan, Guoqiang Liu, Kun Song, Jun Jiang
Summary: A theoretical model was developed to analyze the Bi2Te3-based TEG system, and the results showed that increasing the height of TEG not only improves conversion efficiency but also leads to a peak value of output power. The height of the fin plays a more essential role than the thickness of the fin in optimizing the performance of TEG. By adding an electrical fan, the net output power is doubled and the net conversion efficiency is improved by more than 80%. The study also designed the structure of the TEG system for different material parameters using the theoretical method.
JOURNAL OF POWER SOURCES
(2023)
Article
Thermodynamics
Zipeng Yan, Longbing Yi, Haowei Xu, Shaolin Huang, Kun Song, Chunrong Pan, Jun Jiang
Summary: The mechanical performance of a segmented thermoelectric generator (TEG) is investigated using theoretical and numerical methods. The results show that the structural stress depends on the ratio of cross-sectional areas between p- and n-type TE legs, while the height ratio of different segments has a significant influence on structural stress. Thermal stress induced by unmatched thermal expansion between different segments increases rapidly with the increase of cross-sectional area and can easily exceed 20% of the total interfacial stress. The conversion efficiency and interfacial stress can be optimized by adjusting the ratio of cross-sectional areas. These findings provide a theoretical basis and guidance in the design of segmented TEGs.
JOURNAL OF THERMAL STRESSES
(2023)
Article
Nanoscience & Nanotechnology
Cheng-Ling Tai, Mien-Chung Chen, Tsai-Fu Chung, Yo-Lun Yang, Sheng-Long Lee, Tzu-Ching Tsao, Zhusheng Shi, Jianguo Lin, Te-Cheng Su, Hsueh-Ren Chen, jer-Ren Yang
Summary: The effects of adding a minor amount of Ag (0.4 wt%) to an Al-5.1Cu-1.0 Mg aluminum alloy on microstructural evolution and mechanical properties were investigated. The study analyzed the different aging conditions for alloys with and without Ag to understand the correlation between microstructure and mechanical properties. The presence of Ag led to the formation of the S2 phase, resulting in faster hardness increment and higher ultimate tensile strength during peak aging.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Ceramics
Xianhui Wu, Zhaohua Luo, Yijun Zhuang, Zehua Liu, Peng Sun, Yongfu Liu, Liaolin Zhang, Haiming Qin, Jun Jiang
Summary: Researchers prepared a series of GASGG:Cr3+ ceramic phosphors by doping Sc3+ to increase the emission bandwidth while maintaining high efficiency and thermal stability. A NIR pc-LED prototype device was fabricated by combining GASGG:Cr3+ ceramic phosphor with a blue LED chip, achieving an output power of 646 mW and a photoelectric conversion efficiency of 19.2%. Finally, the application effect of this prototype device in night vision and venography was demonstrated.
CERAMICS INTERNATIONAL
(2023)
Article
Engineering, Environmental
Gang Wu, Xiaojian Tan, Minhui Yuan, Qiang Zhang, Jacques G. Noudem, Zehua Liu, Chen Cui, Jiehua Wu, Haoyang Hu, Peng Sun, Guo-Qiang Liu, Jun Jiang
Summary: A n-type Bi2Te2.7Se0.3 + x wt% PbI2 polycrystalline material with high texture degree and various microstructures was prepared by the temperature gradient method. The dilute PbI2 doping not only adjusted the carrier concentration to an optimal level but also reduced the lattice thermal conductivity, resulting in a peak ZT of 1.26 and improved Vickers hardness of 0.48 GPa.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Manufacturing
Ruiqiang Zhang, Wei Wang, Jianguo Lin, Trevor A. Dean
Summary: A study comparing the Indirect HFQ and Direct HFQ techniques for aluminum alloy forming suggests that grain growth leads to a decrease in mechanical properties during the Indirect HFQ process.
INTERNATIONAL JOURNAL OF MACHINE TOOLS & MANUFACTURE
(2023)
Article
Nanoscience & Nanotechnology
Zhe Zhang, Chenpeng Tong, Wenbin Zhou, Shuai Jiang, Jiaxin Lv, Zhusheng Shi, Jianguo Lin
Summary: This study investigates the abnormal features observed in the thermal-mechanical testing of AA6061 aluminum alloy during hot extrusion. Different initial grain morphologies and the evolution of dislocation density after solution heat treatment are found to be the main causes of these features.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Engineering, Mechanical
Xi Wang, Zhusheng Shi, Jianguo Lin
Summary: This study systematically investigated the anisotropic behavior of the 3rd generation Al-Li alloys during deformation and creep-ageing, proposing a comprehensive anisotropic material model and its implementation method in numerical simulation, which was verified with four-point bending creep age forming (CAF) tests. The anisotropic behaviors of the material including yielding, hardening, and creep deformation were investigated with uniaxial tensile and creep-ageing tests, and an anisotropic material model based on the modified non-associated quadratic Hill48 yield function was established. The proposed model and implementation method were validated through the comparison between predicted and experimental results for four-point bending CAF tests.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Materials Science, Multidisciplinary
Xi Wang, Zhusheng Shi, Chaoyang Sun, Jianguo Lin
Summary: This study investigates the anisotropy evolution of a 3rd generation Al-Li alloy after subjecting it to increased tensile pre-deformation at different angles. The research found that the creep deformation and inplane anisotropy decrease with increasing tensile pre-deformation.
MATERIALS CHARACTERIZATION
(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)
