Multiple strengthening mechanisms in high strength ultrafine-grained Al-Mg alloys

被引：29
|
作者：
Wang, Hao [1 ]
Geng, Hongwei [1 ]
Zhou, Dengshan [1 ,2 ,3 ]
Niitsu, Kodai [2 ]
Muransky, Ondrej [4 ,5 ]
Zhang, Deliang [1 ]
机构：
[1] Northeastern Univ, Sch Mat Sci & Engn, Minist Educ, Key Lab Anisotropy & Texture Mat, Shenyang 110819, Liaoning, Peoples R China
[2] Kyoto Univ, Dept Mat Sci & Engn, Sakyo Ku, Kyoto 6068501, Japan
[3] Kyoto Univ, Ctr Elements Strategy Initiat Struct Mat ESISM, Sakyo Ku, Kyoto 6068501, Japan
[4] ANSTO, Sydney, NSW 2234, Australia
[5] UNSW, Sch Mech & Mfg Engn, Sydney, NSW 2052, Australia
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2020年 / 771卷
关键词：
Ultrafine-grained Al-Mg alloys; Strengthening mechanisms; Stacking faults; Nanodispersoids; FAULT ENERGY; SIZE; MICROSTRUCTURE; DEFORMATION; BEHAVIOR;
D O I：
10.1016/j.msea.2019.138613
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
High strength has always been pursued in binary Al-Mg and 5xxx series Al alloys. However, these alloys usually provide medium strength due to lack of multiple strengthening methods. Here, this study reports on multiple strengthening effects existing in a binary ultrafine-grained (UFG) Al-7.5at.%Mg alloy prepared by mechanical alloying and hot extrusion. Different strengthening mechanisms, in particular, dispersoid strengthening and stacking fault strengthening, are analyzed and evaluated in terms of their respective contribution to the 511 MPa yield strength of the alloy. The strengthening analysis proves that the concurrent generation of nanoscale dispersoids and stacking faults (SPs) can be used as a new microstructural design in developing novel Al-Mg-based alloys with higher strength and enhanced ductility.
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页数：6
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