Exploring the Hall-Petch relation and strengthening mechanism of bimodal-grained Mg-Al-Zn alloys

被引：99
作者：
Jin, Zhong-Zheng [1 ,2 ,3 ]
Zha, Min [1 ,2 ,3 ,4 ]
Yu, Zhi-Yuan [2 ,3 ]
Ma, Pin-Kui [2 ,3 ]
Li, Yong-Kang [2 ,3 ]
Liu, Jin-Ming [2 ,3 ]
Jia, Hai-Long [2 ,3 ,4 ]
Wang, Hui-Yuan [1 ,2 ,3 ,4 ]
机构：
[1] Jilin Univ, State Key Lab Superhard Mat, Changchun 130025, Peoples R China
[2] Jilin Univ, Key Lab Automobile Mat, Minist Educ, Nanling Campus,5988 Renmin St, Changchun 130025, Peoples R China
[3] Jilin Univ, Sch Mat Sci & Engn, Nanling Campus,5988 Renmin St, Changchun 130025, Peoples R China
[4] Jilin Univ, Int Ctr Future Sci, Changchun 130012, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2020年 / 833卷 / 833期
关键词：
Mg-Al-Zn alloys; Hall-petch relation; Strengthening mechanism; Bimodal grain structure; MAGNESIUM ALLOY; DEFORMATION MECHANISMS; RECRYSTALLIZATION BEHAVIOR; TENSILE PROPERTIES; FRICTION STRESS; SIZE; MICROSTRUCTURE; DUCTILITY; TEXTURE; SLIP;
D O I：
10.1016/j.jallcom.2020.155004
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 Hall-Petch (H-P) relation for bimodal-grained Mg-Al-Zn alloys consisting of both ultra-fine grains (UFGs)/fine grains (FGs) and coarse grains (CGs) is discussed separately for yield stress and flow stress according to different deformation behaviors of UFGs/FGs and CGs. The yield behavior is controlled by basal dislocation slip of UFGs/FGs and twinning of CGs collectively. Thereafter, non-basal slip is activated in basal-oriented CGs as deformation proceeds. Considering the synergy effect of UFGs/FGs and CGs, we present modified H-P relations for bimodal-grained Mg-3Al-1Zn (AZ31) and Mg-9Al-1Zn (AZ91) alloys containing either few or numerous dispersed particles, respectively, by which the calculated strengths depict experimental values well. (c) 2020 Elsevier B.V. All rights reserved.
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页数：7
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