Effect of Sc and Er additions on superplastic ductilities in Al-Mg-Mn-Zr alloy

被引：12
作者：
Duan Yu-lu [1 ]
Qian Jian [1 ]
Xiao Dan [1 ]
Cui Xue-min [1 ]
Xu Guo-fu [1 ,2 ,3 ]
机构：
[1] Cent South Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China
[2] Cent South Univ, Minist Educ, Key Lab Nonferrous Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China
[3] Cent South Univ, State Key Lab Powder Met, Changsha 410083, Hunan, Peoples R China
来源：
JOURNAL OF CENTRAL SOUTH UNIVERSITY | 2016年 / 23卷 / 06期
基金：
中国博士后科学基金;
关键词：
Al-Mg-Sc alloy; Al-Mg-Er alloy; superplasticity; microstructure; HIGH-STRAIN RATES; TEMPERATURE SUPERPLASTICITY; DEFORMATION-BEHAVIOR; STABILITY; MECHANISM; CREEP;
D O I：
10.1007/s11771-016-3178-x
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
The superplasticity of Al-6Mg-0.4Mn-0.25Sc-0.12Zr and Al-6Mg-0.4Mn-0.25Er-0.12Zr (mass fraction, %) alloys sheet was investigated, and the effect of Sc and Er was discussed. The results show that the superplastic ductilities of Al-Mg-Mn-Sc-Zr alloy was higher than that of Al-Mg-Mn-Er-Zr alloy at a wide temperature range of 400-540 A degrees C and high strain rate range of 1.67x10(-4)-1.67x10(-1) s(-1). A maximum elongation 673% is obtained at 520 A degrees C and 1.67x10(-3) s(-1) in the Sc-containing alloy; while the Er-containing alloy only gets a maximum elongation 253% at 520 A degrees C and 1.67x10(-3) s(-1). Moreover, the average stress exponent of Sc-containing alloy is about 2.84, which is smaller than that of Er-containing alloy (3.64). Besides, the activation energies of the Sc-containing and Er-containing alloy are 84.8 kJ/mol and 87.2 kJ/mol, respectively. It is indicated that grain boundary sliding is the dominant mechanism during tensile deformation. According to microstructure examination, the better superplasticity of Sc-containing alloy may be attributed to the presence of Al-3(Sc, Zr) dispersoids, which can inhibit recrystallization and grain growth effectively.
引用
收藏
页码：1283 / 1292
页数：10
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