Effect introduced high density of precipitates on the microstructural evolutions during multi-direction forging of Al-Zn-Mg-Cu alloy

被引：16
|
作者：
Zhao, Jiuhui [1 ]
Deng, Yunlai [1 ,2 ,3 ]
Tang, Jianguo [1 ,2 ]
Zhang, Jin [1 ]
机构：
[1] Cent South Univ, Light Alloy Res Inst, Changsha, Peoples R China
[2] Cent South Univ, Sch Mat Sci & Engn, Changsha, Peoples R China
[3] Cent South Univ, State Key Lab High Performance & Complex Mfg, Changsha, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2020年 / 798卷
关键词：
Multi-directional forging; Al-Zn-Mg-Cu alloys; Recrystallization mechanism; Grain refinement; SEVERE PLASTIC-DEFORMATION; MECHANICAL-PROPERTIES; ALUMINUM-ALLOY; GRAIN-REFINEMENT; TEMPERATURE; STRAIN; 7475-AL-ALLOY; BEHAVIOR; ECAP; SC;
D O I：
10.1016/j.msea.2020.139927
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Large number density of coarse precipitates were introduced into the Al-Zn-Mg-Cu alloy by interrupted aging and then over-aging at 300 degrees C. Both the overaged and homogenized samples were isothermal MDFed at 5 x 10(-3) s(-1) with temperatures ranging from 300 degrees C to 450 degrees C to investigate the effect of high number density of precipitates on the microstructural evolutions. The results showed that the precipitates decreased gradually during MDF of overaged samples at 300 degrees C and 350 degrees C while they were almost dissolved at 400 degrees C and 450 degrees C. And as the result of that the precipitates could pin dislocations during deformation, and much greater grain refinement was achieved during MDF of overaged samples at 300 degrees C and 350 degrees C.
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页数：10
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