Effects of minor Sc and Zr additions on mechanical properties and microstructure evolution of Al−Zn−Mg−Cu alloys

被引：55
作者：
XIAO Q.-F. [1 ]
HUANG J.-W. [1 ,2 ]
JIANG Y.-G. [1 ]
JIANG F.-Q. [1 ]
WU Y.-F. [1 ]
XU G.-F. [1 ,2 ]
机构：
[1] School of Materials Science and Engineering, Central South University, Changsha
[2] Key Laboratory of Nonferrous Metallic Materials Science and Engineering, Ministry of Education, Central South University, Changsha
来源：
Transactions of Nonferrous Metals Society of China (English Edition) | 2020年 / 30卷 / 06期
基金：
中国国家自然科学基金;
关键词：
Al[!sub]3[!/sub](Sc; Zr); Al[!sub]3[!/sub]Zr; Al−Zn−Mg−Cu alloys; dislocation motion; mechanical properties; microstructure evolution; recrystallization; strengthening mechanism;
D O I：
10.1016/S1003-6326(20)65308-0
中图分类号：
学科分类号：
摘要：
The effects of minor Sc and Zr additions on the mechanical properties and microstructure evolution of Al−Zn−Mg−Cu alloys were studied using tensile tests, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The ultimate tensile strength of the peak-aged Al−Zn−Mg−Cu alloy is improved by about 105 MPa with the addition of 0.10% Zr. An increase of about 133 MPa is observed with the joint addition of 0.07% Sc and 0.07% Zr. For the alloys modified with the minor addition of Sc and Zr (0.14%), the main strengthening mechanisms of minor addition of Sc and Zr are fine-grain strengthening, sub-structure strengthening and the Orowan strengthening mechanism produced by the Al3(Sc,Zr) and Al3Zr dispersoids. The volume of Al3Zr particles is less than that of Al3(Sc,Zr) particles, but the distribution of Al3(Sc,Zr) particles is more dispersed throughout the matrix leading to pinning the dislocations motion and restraining the recrystallization more effectively. © 2020 The Nonferrous Metals Society of China
引用
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页码：1429 / 1438
页数：9
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