Flow Behavior and Dynamic Recrystallization Mechanism of 7050-T7451 Aluminum Alloy during Hot Deformation

被引:0
|
作者
Wang, Yongshan [1 ]
Zhang, Wen [1 ]
Sun, Xiaolong [2 ]
Huang, Zhibin [2 ]
Sun, Xiaofeng [2 ]
Zhuang, Xincun [1 ,3 ,4 ]
Zhao, Zhen [1 ,3 ,4 ]
机构
[1] Shanghai Jiao Tong Univ, Inst Forming Technol & Equipment, Sch Mat Sci & Engn, Shanghai 200030, Peoples R China
[2] Shanghai Aircraft Mfg Corp, Inst Aviat Mfg Technol, Shanghai 201324, Peoples R China
[3] Shanghai Jiao Tong Univ, Natl Engn Res Ctr Die & Mold CAD, Shanghai 200240, Peoples R China
[4] Shanghai Jiao Tong Univ, State Key Lab Met Matrix Composites, Shanghai 200240, Peoples R China
基金
中国国家自然科学基金;
关键词
7050-T7451 aluminum alloy; discontinuous yielding; dynamic recrystallization; flow behavior; strain-compensation Arrhenius model; MICROSTRUCTURAL EVOLUTION; CONSTITUTIVE MODEL; PROCESSING MAP; STRAIN-RATE; STRESS; COMPRESSION;
D O I
10.1007/s11665-024-10471-0
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The flow behavior, constitutive relationship, microstructure evolution and discontinuous yielding of 7050-T7451 alloy were investigated via isothermal compression tests. The results show that the flow curves exhibit extensive stress softening. The obvious discontinuous yielding was also observed at high strain rates. An enhanced strain-compensation Arrhenius model further compensating temperature, strain rate and strain was proposed, which is more suitable for describing the constitutive relationship of this alloy with high correlation coefficient and low mean square error. The Zener-Holloman (Z) parameter was utilized to characterize the combined influence of temperature and strain rate on dynamic softening mechanism. The alloy undergoes significant dynamic recovery under the conditions of high lnZ (>30), accompanied by slight geometric dynamic recrystallization. With the decrease of lnZ, the primary softening mechanism gradually transforms from continuous dynamic recrystallization (CDRX) to discontinuous dynamic recrystallization. The stress softening is mainly related to CDRX, while the discontinuous yielding may be caused by the multiplication of dislocations.
引用
收藏
页数:16
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