Article
Materials Science, Multidisciplinary
Hui Zhao, Lingying Ye, Quanshi Cheng, Yuan Kang, Wenjing Zhang
Summary: The hot deformation behavior of an annealed 7055 aluminum alloy was studied through isothermal compression tests. A constitutive equation was established and processing maps were created to determine the recommended processing parameters. Good workability and uniform deformation grains can be achieved under the temperature range of 300-400 degrees Celsius and strain rates range of 10- 1.5-1 s-1. The dominant softening mechanism is dynamic recovery, with the effect of dynamic recrystallization enhanced in regions of low strain rate and high temperature deformation.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Guisheng Li, Wenliang Rui, Gaoshan Xu, Mingya Zhang, Jinghui Li
Summary: This study conducted an isothermal compression test on extreme-cooled 7055 aluminum alloy and investigated its constitutive model and microstructure evolution. The softening mechanism under different deformation conditions was studied using electron backscattered diffraction and transmission electron microscopy.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Linlin Liu, Guoqun Zhao, Guangchun Wang, Xinwu Ma, Zhaohui Yan, Shanpeng Cao
Summary: Hot compression tests were conducted on 7055 aluminum alloy under different conditions, and the microstructure and deformation behavior were analyzed. The results showed that the softening mechanism of the alloy was mainly attributed to recovery and partial recrystallization. The combined effects of strain rate and temperature on recrystallization behavior were revealed using the Zener-Holloman parameter.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Yong Shao, Qihang Liu, Lin Yan, Jiahui Shi, Pingyi Guo, Shujin Chen
Summary: The hot deformation behavior of spray-formed 7055 aluminum alloy was investigated using a thermo-mechanical simulator through a series of compression tests. Specific thermo-mechanical conditions were found to determine the onset and degree of dynamic recrystallization behavior. A new three-stage constitutive equation and microstructure evolution model accurately predicted the flow stress and DRX characteristics during the hot deformation process.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2022)
Article
Materials Science, Multidisciplinary
Rui Luo, Yun Cao, Huakang Bian, Leli Chen, Ching-Tun Peng, Fuyang Cao, Lingxiao Ouyang, Yu Qiu, Yanjin Xu, Aikihiko Chiba, Xiaonong Cheng
Summary: In this study, the hot workability of a spray formed 7055 aluminum alloy was investigated using advanced Gleeble thermo-mechanical simulation technology and EBSD technology. It was found that with increasing deformation parameters, the grains become finer and the distribution of crystal orientation becomes more homogeneous. Additionally, both Continuous Dynamic Recrystallization (CDRX) and Discontinuous Dynamic Recrystallization (DDRX) mechanisms coexist during hot deformation.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
Meng Liu, Zhongde Shan, Xinya Li, Yong Zang
Summary: The hot tensile deformation behavior of 7075 aluminum alloy sheet was studied at deformation temperatures of 400-475 degrees C and strain rates of 0.001 to 1s(-1). Microstructure evolution and fracture morphology were observed. The hyperbolic sine Arrhenius constitutive equation can characterize the flow behavior of the alloy, and the hot deformation activation energy is 132.52 kJ/mol. The fracture mechanism changes from ductile to brittle with increasing deformation temperatures.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Crystallography
Jing Wang, Guiqian Xiao, Jiansheng Zhang
Summary: A new, precise constitutive model based on the partial derivative of flow data was constructed to study the hot deformation behavior of and obtain the optimal hot processing parameters for 2219 aluminum alloy. Hot processing maps were constructed based on the new model. The results showed that the new model exhibited significantly higher prediction accuracy than the Arrhenius model and provided valuable guidance for the hot working process formulation of 2219 aluminum alloy.
Article
Materials Science, Multidisciplinary
Di Feng, Rui Xu, Jichen Li, Wenjie Huang, Jingtao Wang, Ying Liu, Linxiang Zhao, Chengbo Li, Hao Zhang
Summary: The evolution behaviors of the second phase, substructure and grain of the spray-deposited 7055 aluminum alloy during hot compression were studied. Results showed that certain phases dissolved gradually while others remained unchanged. The alloy exhibited plastic instability at specific temperature and strain rate, and both partial dynamic recrystallization and continuous dynamic recrystallization were observed.
Article
Materials Science, Multidisciplinary
Sadun Karabiyik, Yasin Alemdag, Mustafa Atmaca, Gencaga Purcek, Ali Pasa Hekimoglu
Summary: This study explores the effect of successive hot and cold multi-directional forging on the mechanical properties of the Al-9Si-0.6Mg-0.1Sr alloy. It is found that nine passes of hot forging are optimal for obtaining the highest yield and tensile strength.
Article
Materials Science, Multidisciplinary
Naeimeh Fakhar, Ehsan Khademi, Mahdi Sabbaghian, Amir Momeni, Faramarz Fereshteh-Saniee, Peter Nagy, Abel Szabo, Jeno Gubicza
Summary: This study investigates the effect of Dual Equal Channel Lateral Extrusion (DECLE) on the microstructural evolution and mechanical behavior of an annealed AA5083 aluminum alloy. The results show that DECLE is effective in grain refinement and can significantly reduce the grain size. The material constants, such as the stress exponent and activation energy, are found to be influenced by factors such as grain size, high-angle grain boundaries (HAGBs), dislocation density, and second phase particles fraction.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Jing Wang, Guiqian Xiao, Jiansheng Zhang
Summary: This study investigates the hot deformation behavior of 5A06 aluminum alloy and develops a high-precision constitutive model and hot processing map. The results show that the new constitutive model, which considers the relationship between logarithmic stress and temperature, as well as logarithmic strain rate, can be constructed with a small number of material parameters and has higher predictive accuracy.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Metallurgy & Metallurgical Engineering
Majid Seyed-Salehi, Bong Hwan Kim, Seung Yoon Yang, Shae Kwang Kim, Ghasem Eisaabadi Bozchaloei
Summary: In this study, the effects of Cr on the hot deformation behavior of newly-developed ECO-7175 alloy were investigated. The results showed that the rate-controlling mechanisms of the deformation change gradually from self-diffusion of Al (or diffusion of Mg in Al) to diffusion of Cr in Al in Cr-containing alloy.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2022)
Article
Materials Science, Multidisciplinary
Ling Qiao, Jingchuan Zhu
Summary: The hot deformation behavior of an equiatomic AlCrFeNi medium entropy alloy was investigated in this study. The analysis showed a linear dependence of flow stress on Zener-Hollomon parameter and the constitutive model developed by support vector machine performed better in describing the interdependency between deformation temperature, strain rate, and flow stress.
Article
Materials Science, Multidisciplinary
Ying Zhang, Jufu Jiang, Ying Wang, Yingze Liu, Minjie Huang
Summary: This work investigated the effects of temperature, strain rate, strain and initial orientation on the hot-compression behavior and microstructural evolution of hot-extruded 6A02 aluminum alloy. The results showed that higher temperature and lower strain rate led to lower geometrically necessary dislocation density, lower stored strain energy, and higher dynamic recrystallization degree. The continuous dynamic recrystallization mechanism was superior to the discontinuous dynamic recrystallization mechanism.
MATERIALS CHARACTERIZATION
(2022)
Article
Metallurgy & Metallurgical Engineering
Tong Lu, Zhen-hua Dan, Kai LI, Dan-qing Yi, Lian Zhou, Hui Chang
Summary: The hot deformation behaviors and microstructure evolution of Ti-3Al-5Mo-4Cr-2Zr-1Fe (Ti-35421) alloy in the fl single field were investigated through isothermal compression tests. It was found that discontinuous yield phenomenon and rheological softening are influenced by strain rates and deformation temperatures. By determining critical conditions for dynamic recrystallization, establishing a kinetic model, and constructing an Arrhenius constitutive model, the rheological behaviors of the alloy were accurately predicted above the fl phase transformation temperature.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2022)
