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
Nanoscience & Nanotechnology
Xiaoqiang Li, Qichi Le, Dandan Li, Ping Wang, Peipeng Jin, Chunlong Cheng, Xingrui Chen, Liang Ren
Summary: The hot tensile test was performed on an extruded Mg-5Li-3Al-2Zn (LAZ532) alloy with a heterostructure of fibrous extrusion zones (FEZs) and nonfibrous extrusion zones (non-FEZs) coexisted, showing that the alloy exhibited superplastic characteristics at lower strain rates or higher deformation temperatures. The microstructure analysis revealed different deformation behaviors between the FEZs and non-FEZs, with different mechanisms dominating during different stages of deformation. The activation energy was calculated to be around 110.0 kJ/mol, and the hot tensile deformation mechanism involved alternating and coordinated deformation among grain boundary slip, intragranular slip, and dynamic recrystallization (DRX).
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
Sijia Wang, Jixin Yang, Jianfei Sun, Wenxiang Shu, Haibin Yang, Alfonso H. W. Ngan, Yongjiang Huang
Summary: Here, TA15 samples near alpha titanium alloy were fabricated using electron beam selective melting (EBSM), and their high-temperature tensile deformation behaviors were studied. The results showed that the samples exhibited work hardening and softening at different temperatures, and the EBSM-built TA15 samples had excellent mechanical properties at medium temperatures. These findings are helpful for the industrial applications of EBSM-built titanium alloy components in the aerospace fields.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Zhixin Zhang, Jiangkun Fan, Ruifeng Li, Hongchao Kou, Zhiyong Chen, Qingjiang Wang, Hailong Zhang, Jian Wang, Qi Gao, Jinshan Li
Summary: The study on Ti65 titanium alloy sheet revealed anisotropic properties in terms of tensile strength, yield strength, and creep endurance between transverse direction (TD) and rolling direction (RD). The orientation of grains and crack initiation sites also showed distinct differences during the creep process. Factors contributing to this anisotropy include changes in Schmid factors values and differences in creep mechanisms between TD (grain boundary sliding) and RD (dislocation slip). It is important to fully consider the anisotropy of Ti65 sheet to enhance structural efficiency in engineering design and application.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Partha Duley, Souriddha Sanyal, T. K. Bandyopadhyay, Sumantra Mandal
Summary: In this study, annealing treatments were conducted on magnesium alloys forged at different temperatures. The specimens forged at 573 K and subsequently annealed at 623 K for 5 min exhibited a better combination of tensile properties compared to the other specimens, attributed to the unique grain size heterogeneity and the presence of finer and coarser second phase particles.
MATERIALS CHARACTERIZATION
(2021)
Article
Nanoscience & Nanotechnology
A. V. Mikhaylovskaya, M. Esmaeili Ghayoumabadi, A. G. Mochugovskiy
Summary: The study investigated the influence of different alloying elements on the microstructural evolution, superplastic behavior, and tensile properties of Al-Mg-Si-based alloys, with a focus on the formation of dispersoids and particle size distribution after thermomechanical treatment. The alloys studied exhibited good superplastic behavior within specific temperature and strain rate limits, along with improved mechanical properties after age-hardening heat treatment.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Chemistry, Physical
Sheng-Xian Yi, Zhong-Jiong Yang, Huang-Xin Xie
Summary: This study investigated the deformation behavior of TC21 titanium alloy using high-temperature tensile tests. It was found that the flow stress of the material gradually decreases with an increased strain rate and increases rapidly with an increase in strain during deformation. The established Arrhenius and Radial Basis Function models accurately describe the high-temperature deformation behavior of the material.
Article
Chemistry, Physical
Dong Han, Yongqing Zhao, Weidong Zeng
Summary: The addition of 1% Zr was found to significantly improve the microstructure and superplasticity of forged SP700 alloy, leading to enhanced tensile properties and deformability of the alloy.
Article
Materials Science, Multidisciplinary
Ting Yang, Xiaoqiang Li, Lei Zhang, Jinhui Wang, Peipeng Jin
Summary: The deformation mechanism and microstructure evolution of the Mg-2Nd alloy during hot tensile deformation were investigated. It was found that the peak stress decreases and the elongation to fracture increases with increasing deformation temperature. The alloy contains fibrous extrusion zones (FEZs) and non-fibrous extrusion zones (non-FEZs), with the microstructure deformation in the FEZs being more pronounced. In the initial deformation stage, grain deformation occurs primarily in the FEZs, while recrystallization occurs in both FEZs and non-FEZs in the later deformation stage. The dominant deformation mechanism in the FEZs is intragranular slip, supplemented by grain boundary slip (GBS), while the dominant deformation mechanism in the non-FEZs is GBS, with coordinated intragranular slip. The recrystallization mechanism in the FEZs is continuous dynamic recrystallization (CDRX), while it is discontinuous dynamic recrystallization (DDRX) in the non-FEZs. Thus, the dominant hot tensile deformation mechanisms of the alloys alternate between intragranular slip, GBS, and dynamic recrystallization (DRX).
MATERIALS CHARACTERIZATION
(2022)
Article
Metallurgy & Metallurgical Engineering
Jian-wei Xu, Wei-dong Zeng, Da-di Zhou, Sheng-tong He, Run-chen Jia
Summary: The study on a two-phase titanium alloy shows that the ability of coordinated deformation between alpha and /3 phases can influence the uniformity of microstructure evolution. When this ability is good, the BOR is maintained between alpha and /3 phases, while it deteriorates when the coordination is poor, leading to interface dislocation and deviation from the BOR.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2021)
Article
Materials Science, Multidisciplinary
Shiwei Ci, Jiaqi Hu, Zonghui Cheng, Qingwei Liu, Suijie Xie, Xiaoye Cai, Dingping Dong, Qiwei Wang
Summary: This study investigates the influence of hot isostatic pressing (HIP) temperature on the tensile characteristics of TA15 titanium alloy. The results show that heat treatment and HIP treatment result in differences in microstructure and metallographic structure, as well as affecting the tensile strength, yield strength, and elongation of the material.
Article
Materials Science, Multidisciplinary
Jian Ning, Qun Li, Zongyuan Zou, Tianwei Liu, Lei Chen
Summary: Research on the hot tensile deformation behavior of 2195 Al-Li alloy in the temperature range of 440-500 degrees C revealed that the degree of dynamic recrystallization increases with the strain, and the pinning effect of precipitations is more sensitive to temperature. When the temperature reaches 500 degrees C, the weakening of the pinning effect of precipitations makes it easier to activate more dynamic recrystallization.
Article
Materials Science, Multidisciplinary
Manh Tien Nguyen, Van Thao Le, Manh Hung Le, Truong An Nguyen
Summary: This study achieved ultrafine grains in microstructures of Ti5Al3Mo1.5 V titanium alloy through the multidirectional forging (MDF) process, and investigated its superplastic properties. Tensile tests at specific temperatures and strain rates demonstrated a significant enhancement of superplasticity in the studied alloy.
Article
Nanoscience & Nanotechnology
I. V. Ratochka, I. P. Mishin, O. N. Lykova, E. V. Naydenkin
Summary: The study explores the superplastic behavior of ultrafine-grained Ti-5Al-5V-5Mo-1Cr-1Fe alloy in the temperature range 773-1023 K. It is found that the formation of a more equilibrium structural-phase state after annealing significantly reduces elongation to failure and shifts the superplasticity temperature to higher deformation temperatures. The high elongation to failure during superplastic deformation is thought to be due to the formation of a deformation-induced grain structure with small grains forming interlayers between large grains.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Shuai Yuan, Jinhui Wang, Peipeng Jin, Lei Zhang
Summary: The study found that as the temperature increased or the strain rate decreased, the peak stress during hot tensile deformation of the alloy decreased and elongation increased. Hot tensile increased texture intensity and the microstructure exhibited characteristic features of basal fiber texture.
MATERIALS RESEARCH EXPRESS
(2021)
