Achieving high superplasticity of a traditional thermal-mechanical processed non-superplastic Al-Zn-Mg alloy sheet by low Sc additions

被引:27
作者
Duan, Yulu [1 ]
Xu, GuoFu [1 ,2 ]
Zhou, Liqi [1 ]
Xiao, Dan [1 ]
Deng, Ying [1 ,3 ]
Yin, Zhimin [1 ]
Peng, Bing [3 ]
Pan, Qinglin [1 ]
Wang, Yingjun [4 ]
Lu, Liying [4 ]
机构
[1] Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China
[2] Cent S Univ, Key Lab Nonferrous Mat Sci & Engn, Minist Educ, Changsha 410083, Hunan, Peoples R China
[3] Cent S Univ, Sch Met & Environm, Changsha 410083, Hunan, Peoples R China
[4] Northeast Light Alloy Co Ltd, Harbin 150060, Peoples R China
基金
中国博士后科学基金;
关键词
Superplasticity; Al-Zn-Mg alloy; Fine-grained structure; Microstructure; Deformation mechanism; LOW-TEMPERATURE SUPERPLASTICITY; STRAIN RATE SUPERPLASTICITY; ZR MICROALLOYING ADDITIONS; ALUMINUM-ALLOYS; DEFORMATION-BEHAVIOR; 7075AL ALLOY; CREEP; RECRYSTALLIZATION; CAVITATION; PARTICLES;
D O I
10.1016/j.jallcom.2015.03.090
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The non-superplastic Al-Zn-Mg alloy sheet produced by a simple traditional thermal-mechanical processing can achieve high superplasticity at the temperatures ranging from 450 to 500 degrees C and the strain rates ranging from 1 x 10 (3) to 1 x 10 (2) s (1) by low scandium additions in the presence of 0.10% Sc (wt.%). An elongation of 1050% is obtained at 500 degrees C and 5 x 10 (3) s (1). Analyses on the superplastic data reveal that the average values of the strain rate sensitivity and the activation energy of the Al-Zn-Mg-Sc-Zr alloy are about 0.5 and 85 kJ/mol (1), respectively. The microstructural results show that the studied alloy consists of 3.14 mu m grains characterized by a high fraction of low angle grain boundaries and strong beta-fiber rolling textures. During superplastic deformation, low angle grain boundaries gradually transfer into high angle grain boundaries to sustain grain boundary sliding, and the texture intensity diminishes. Besides, beta-fiber rolling textures weaken and cube and random textures are dominant in the superplastic deformed alloy. Superior superplastic ductility of the Al-Zn-Mg-Sc-Zr alloy is ascribed to the coherent 10-20 nm Al3ScxZr1 x particles that strongly retard recrystallization grain growth. Analyses of the superplastic data indicate that grain boundary sliding is the predominant deformation mechanism. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码:364 / 373
页数:10
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