Article
Chemistry, Physical
Xiong Zhou, Qichi Le, Chenglu Hu, Dandan Li, Tong Wang, Qiyu Liao, Ruizhen Guo, Chunming Liu, Xiaotao Liu
Summary: The hot deformation behavior of homogenized Mg-1.4Sn-0.93Zn-0.83Ca-0.67Mn-0.39Al alloy was studied, and a constitutive equation and hot processing map were successfully established. The results showed that the hot processing of this alloy should avoid the low-temperature area, and the optimum stable deformation areas were identified. Detailed microstructural studies revealed the crucial role of dynamic recrystallization in the alloy's stability, and the mechanisms involved were identified. In addition, the analysis of in-grain misorientation axes demonstrated the activation of non-basal slips during deformation.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Tao Wei, Yadong Wang, Zhenghua Tang, Sufen Xiao
Summary: The true stress-strain curve of Al-Mg-Si-Cu-Zn alloy under high temperature and high strain rate conditions was obtained, and the constitutive equation was established. The optimum hot working window was determined based on the comparison of predicted values from the model with experimental values.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Jingyu Jiang, Feng Jiang, Hongfeng Huang, Menghan Zhang, Zhongqin Tang, Mengmeng Tong
Summary: The deformation behavior and microstructure evolution of the alloy are significantly affected by deformation temperature and strain rate. High temperature and low strain rate are beneficial for dynamic recrystallization or dynamic recovery.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Yaqin Yang, Yunfang Liu, Xintao Guo, Caihong Yin, Jianmin Yu, Zhimin Zhang, Huagui Huang
Summary: This study systematically investigated the hot deformation behavior, microstructure, and texture evolution of Mg-9Li-1Zn (LZ91) alloy, and developed the best Arrhenius hot deformation constitutive equation model and processing map for the alloy. The results showed that the hot deformation behavior of the LZ91 alloy can be accurately predicted using the Arrhenius constitutive equation. The alloy exhibited instability in specific temperature and strain rate ranges, and the microstructure revealed deformation through the cooperation of different slip systems, resulting in a gradient increase in hardness due to grain refinement and texture.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Chen Li, Zhuo Chen, Xin-Quan Zhang, Wen-Long Xiao, Yue Ma
Summary: This study investigated the hot deformation behavior and microstructural evolution of as-homogenized 7A65 Al alloy under isothermal compression. It was found that the flow stress exhibited a typical dynamic recovery characteristic at high-temperature deformation conditions, and a constitutive equation was proposed to describe the flow behavior. The hot processing map was established, and the optimal processing conditions were determined. Deformation temperature and strain rate had a significant effect on the microstructure evolution, with the main softening mechanism being dynamic recovery, but dynamic recrystallization was enhanced with the increase in temperature.
Article
Materials Science, Multidisciplinary
Guo-lei Liu, Wei-li Cheng, Lin Luo, Hui Yu, Li-fei Wang, Hang Li, Hong-xia Wang, Jin-hui Wang
Summary: In this study, the dynamic recrystallization (DRX) mechanism and hot-deformation behavior of a novel precipitate-free Mge0.25Bie0.25Sn alloy were investigated. Processing maps and constitutive equations were constructed to predict the hot deformation behavior. The results showed that continuous dynamic recrystallization (CDRX), discontinuous dynamic recrystallization (DDRX), and a transformation of prismatic slip to pyramidal II slip occurred during hot compression.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Ding-ge Fan, Kun-kun Deng, Cui-ju Wang, Kai-bo Nie, Quan-xin Shi, Wei Liang
Summary: The addition of trace SiCp reduces the activation energy of the Mg-5Zn alloy, and the optimal deformation conditions were determined based on the processing map. The study also looked at the influence of PDZ size on the activation energy, as well as the effect of SiCp on the dynamic recrystallization behavior.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Chemistry, Physical
Minbao Wu, Wu Wei, Rui Zuo, Shengping Wen, Wei Shi, Xiaorong Zhou, Xiaolan Wu, Kunyuan Gao, Hui Huang, Zuoren Nie
Summary: The hot compression behavior of a homogenized Al-5.2Mg-0.6Mn-0.29Zn-0.16Er-0.12Zr alloy was investigated under different deformation conditions. The relationship between stress, strain rate, and deformation temperature was analyzed, and a constitutive equation was established. The addition of Er and Zr into the alloy resulted in grain refinement, precipitation strengthening, and the formation of Al-3(Er, Zr) phase. Dynamic recovery was dominant during hot deformation, while dynamic recrystallization was inhibited. The alloy showed a high activation energy for hot deformation, attributed to the pinning effect of Er and Zr precipitates. The processing map helped determine the suitable process parameters for hot deformation.
Article
Materials Science, Multidisciplinary
V. Anil Kumar, Aditya Sarkar, R. K. Gupta, M. J. N. V. Prasad, S. V. S. N. Murty
Summary: Hot isothermal compression testing of Ti-5Al-5V-2Mo-1Cr-1Fe alloy with lamellar microstructure was conducted to study the flow curves and constitutive relationships at different temperatures and strain rates. Processing maps generated using a dynamic material model indicated the optimal working domains for the alloy to be at temperatures of 1123-1163 K and strain rates of 10(-2)-10 s(-1).
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2021)
Article
Materials Science, Multidisciplinary
Fuwei Kang, Jinlong Lu, Enhao Wang, Bing Wang, Shangzhuo Li, Xianyong Wang, Wei Jiang
Summary: This paper conducted an isothermal thermal compression simulation test on 2024 aluminum alloy. The experimental results show that the change of flow stress is inversely proportional to the deformation temperature, but directly proportional to the strain rate. Observations of the microstructure after thermal deformation indicate the formation of recrystallization and the decrease of dislocation density, which is the main reason for dynamic softening. The thermal deformation activation energy of 2024 aluminum alloy is 201.62 kJ/mol. The hot working diagram of 2024 aluminum alloy was established, with the ideal deformation conditions being a deformation temperature of 573-673 K and a strain rate of 0.01-0.1 s(-1).
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Chemistry, Physical
Yuehua Sun, Bin Yang, Fan Zhang, Richu Wang, Chaoqun Peng, Jian Ren, Guangsheng Song
Summary: The hot deformation behavior of the Mg-5Li-3Al-2Zn-0.2Zr alloy was investigated through hot compression tests. The true stress-strain curves showed dynamic recrystallization. The proposed strain-compensated Zener-Hollomon model accurately predicted the flow stress, and the average activation energy of the alloy was calculated. The microstructure evolution revealed different types of dynamic recrystallization at different temperatures.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Aida Azizi, Shahab Zangeneh, Milad Mojtahedi, Sajad Rasaee
Summary: The present study investigated the hot deformation behavior of AA4032 alloy modified with Ni and Cu. The effect of extra copper and nickel on the microstructure and phase formation was studied. The best hot working condition was found to be at a temperature range of 720-780 K with a strain rate of 0.001-0.03 s1.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Jun Cai, Lin Chen, Peng Han, Juan Yang, Qingxiang Yang, Qingyang Li, Ben Ding, Ke Qiao, Jiang Li, Qian Zhao, Wen Wang, Kuaishe Wang
Summary: The hot deformation behavior of Mg-9.16Gd-3.03Y-1.44Zn-0.61Zr alloy was investigated through hot compression experiments, optical microscopy, electron back-scatter diffraction, and transmission electron microscopy. The results revealed that the alloy exhibited dynamic recrystallization under high temperature and strain rate conditions, and the volume fraction of dynamic recrystallization grains was influenced by temperature and strain rate.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Deqing Ma, Shuai Yuan, Shiyu Luan, Peipeng Jin, Hengrui Hu, Jinhui Wang, Xiaoqiang Li
Summary: The hot deformation behavior of as-cast Mg-2Zn-0.5Mn-0.2Ca alloys was investigated by hot compression tests. The flow stress was found to increase with higher strain rates and lower temperatures. A constitutive equation was obtained, and the average activation energy was calculated. A processing map was developed, and the optimal processing parameters were determined. The microstructural analysis revealed significant differences between instability areas and stable areas, although both had a similar texture. The slip system in deformed grains was determined, and the main dynamic recrystallization mechanism was identified as discontinuous dynamic recrystallization (DDRX). The proportion of DRX increased with lower strain rates and higher deformation temperatures, weakening the texture strength.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Yuhang Guo, Yibo Dai, Pan Chen, Qianhao Zang, Zhenya Zhang
Summary: In this study, Mg-3Sn-2Al-1Zn-0.6Nd alloys were prepared and their hot deformation behavior and recrystallization mechanisms were investigated. The results showed that the alloys had a high power dissipation efficiency within specific temperature and strain rate ranges, and fine dynamic recrystallization grains and deformed twinning were formed after hot deformation.
