Article
Materials Science, Multidisciplinary
Hui Yi, Jian Ding, Changan Ni, Jiahang Dai, Ying Tang, Xueguang Chen, Kaihong Song, Xingchuan Xia
Summary: By studying the hot deformation behavior and intrinsic machinability of Al-0.5Mg-0.4Si-0.1Cu alloy, an accurate constitutive equation and processing map were established, and the optimal process parameters of the alloy were optimized.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Chuan Lei, Qudong Wang, Huaping Tang, Tianwen Liu, Zhongyang Li, Haiyan Jiang, Kui Wang, Mahmoud Ebrahimi, Wenjiang Ding
Summary: Isothermal uniaxial compression experiments were conducted on homogenized Al-5Mg-3Zn-1Cu alloy to investigate its hot deformation behavior. A strain-compensated constitutive model was established to predict flow stress with high accuracy. The dominant deformation mechanism of the alloy was identified as dislocation climbing, and processing maps were constructed to identify workable and unstable domains in different temperature and strain rate ranges.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Chemistry, Physical
B. Ebrahimpourghandi, R. Mahmudi
Summary: The hot deformation behavior and constitutive analysis of the as-cast and extruded Mg-2.5Gd-0.5Zr alloy were compared using the shear punch testing (SPT) method. The results showed that grain boundary sliding was the prevailing deformation mechanism. The efficiency of power dissipation exceeded 30% in most areas for both cast and wrought conditions.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
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
Chemistry, Physical
Junfei Ma, Songhui Wang, Jianlei Yang, Wencong Zhang, Wenzhen Chen, Guorong Cui, Guannan Chu
Summary: Isothermal hot compression experiments were conducted on Mg-2.5Nd-0.5Zn-0.5Zr alloy to investigate the hot deformation behavior. A strain compensation constitutive model was established to predict the flow stress of the alloy, and the main deformation mechanism was identified as dislocation climbing. Processing maps showed instability occurred at high strain rates and low temperatures, with the optimum machining range determined to be 592-773 K and 0.001-0.217 s(-1).
Article
Materials Science, Multidisciplinary
Jiachen Li, Xiaodong Wu, Bin Liao, Lingfei Cao
Summary: The study investigated the hot deformation behaviors of Al-Mg-Si alloys at different temperatures and strain rates, revealing the patterns of uneven dynamic recrystallization distribution, and establishing a corresponding dynamic recrystallization kinetic model.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Chang-Hee Cho, Dal-Oh Kim, Kwangtae Son, Hyun-Soon Park
Summary: Al-Zn-Mg-Cu alloys exhibit the best mechanical properties among aluminum alloys, but suffer from poor formability during metalworking processes. This study investigates the high-temperature deformation behavior and mechanisms of an Al-Zn-Mg-Cu alloy, highlighting flow instabilities at higher strain rates and cooler temperatures, reduced recrystallization, diminished power dissipation efficiencies, and notable alpha-fiber generation.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Chemistry, Physical
Chen Li, Qingshan Zhou, Mengnan Han, Shaohui Sha, Yuntian Luo, Xiaojing Xu
Summary: This study investigated the microstructure and mechanical properties of an Al-11Zn-3.1Mg-1.2Cu-0.2Zr-0.16Ti alloy with different Er contents. The inclusion of Er increased the density and volume fraction of L12-Al3(Er, Zr), which reduced re-crystallization tendency and improved grain refinement. However, excessive Er led to the formation of coarse intermetallic compounds and deterioration of mechanical properties. The alloy with 0.15 wt.% Er showed optimal mechanical properties, with a yield strength of 771.7 MPa, ultimate tensile strength of 785.9 MPa, and elongation of 9.5%.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Aliakbar Emdadi, Heiner Michels, Michael Tovar
Summary: Fe-Al-Ta alloys are potential replacements for high-alloyed steels in steam turbine blades, however, their mechanical properties are not optimal due to limited grain refinement. This study investigated the hot deformation behavior and workability of an Fe-25Al-1.5Ta alloy using constitutive modeling and processing maps. The optimum processing window for this alloy was determined to be 910-1060°C/0.0013-0.005 s-1, where the power dissipation efficiency and strain rate sensitivity reached 50% and 0.33, respectively. This study provides valuable insights for the safe and efficient deformation of Fe-Al-Ta alloys.
Article
Materials Science, Multidisciplinary
Menghan Zhang, Chengbo Li, Yong Zhang, Shengdan Liu, Jingyu Jiang, Jianguo Tang, Lingying Ye, Xinming Zhang
Summary: The study found that the alloy after hot deformation has a different microstructure compared to the one without hot deformation, with more recrystallized grains and subgrains, accompanied by a higher amount of quenching-induced phases. Furthermore, it was observed that hot deformation has a significant impact on the microstructure and precipitation behavior of the alloy.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
Yi Yu, Qinglin Pan, Weiyi Wang, Zhiqi Huang, Shengqian Xiang, Bing Liu
Summary: Isothermal hot compression tests were conducted on Al-Mg-Si-Ce-B alloy at temperatures from 623-823 K with strain rates of 0.01-50 s-1. The alloy showed plastic deformation instability at relatively low temperatures, with optimized deformation parameters identified as 783-823 K/0.03-0.04 s. The microstructure was characterized using TEM and EBSD, and the influence of Z parameter on dynamic softening mechanisms was discussed, showing both DRV and CDRX as softening mechanisms during hot deformation.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Materials Science, Multidisciplinary
Jiachen Li, Xiaodong Wu, Lingfei Cao, Bin Liao, Yichang Wang, Qing Liu
Summary: The hot deformation behavior of Al-Mg-Si alloys was studied through isothermal compression tests, revealing that the dynamic recrystallization mechanism depends on the Zener-Hollomon values. Three different DRX mechanisms were observed during the experimental process.
MATERIALS CHARACTERIZATION
(2021)
Article
Chemistry, Physical
Zhaoqian Sun, Yongjun Li, Kui Zhang, Xinggang Li, Minglong Ma, Guoliang Shi, Jiawei Yuan, Hongju Zhang
Summary: The study found that the Mg-Sn-Al alloy has good hot deformation characteristics and excellent plastic deformation properties. The alloy has a wide thermal processing range and a stable processing interval within a broad range of deformation temperatures and rates, with optimal process parameters being deformation temperatures between 603 and 633 K and strain rates of 0.03 to 0.005 s(-1).
Article
Materials Science, Multidisciplinary
Yifu Jiang, Hua Ding
Summary: This study investigates the hot deformation behavior and DRX mechanism of 7075 aluminum alloy through hot compression tests. The results show that DRX is the main softening mechanism of the alloy and there are relationships among temperature, strain rate, and Z parameter. As the temperature increases, the recrystallization fraction and grain size also increase.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Materials Science, Multidisciplinary
Jun Cai, Lin Chen, Juan Yang, Wen Wang, Ben Ding, Qingxiang Yang, Ke Qiao, Kuaishe Wang
Summary: In this study, an isothermal compression experiment was conducted to investigate the rheological behavior of Al-4.57Zn-1.50Mg-1.92Cu high-strength aluminum alloy. The strain rate and temperature were found to significantly affect the flow stress level. A constitutive equation was established and proven to accurately predict the performance. Additionally, a processing map was created to assess deformation safety, and the microstructure evolution was observed using various microscopy techniques. The findings indicated that dynamic recovery and small-scale dynamic recrystallization played a major role in the softening mechanism during hot deformation, and dynamic recrystallization had a significant impact on the alloy's hot deformation behavior.
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)