Influence of yttrium content on phase formation and strain hardening behavior of Mg-Zn-Mn magnesium alloy

被引：43
作者：
Tahreen, N. [1 ]
Zhang, D. F. [2 ,3 ]
Pan, F. S. [2 ,3 ,4 ]
Jiang, X. Q. [4 ,5 ]
Li, C. [4 ]
Li, D. Y. [6 ]
Chen, D. L. [1 ]
机构：
[1] Ryerson Univ, Dept Mech & Ind Engn, Toronto, ON M5B 2K3, Canada
[2] Chongqing Univ, Coll Mat Sci & Engn, Chongqing 400045, Peoples R China
[3] Chongqing Univ, Natl Engn Res Ctr Magnesium Alloys, Chongqing 400044, Peoples R China
[4] Chongqing Acad Sci & Technol, Adv Mat Res Ctr, Chongqing 401123, Peoples R China
[5] Southwest Univ, Fac Mat & Energy, Chongqing 400715, Peoples R China
[6] Univ Alberta, Dept Chem & Mat Engn, Edmonton, AB T6G 2V4, Canada
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2014年 / 615卷
基金：
加拿大自然科学与工程研究理事会; 加拿大创新基金会;
关键词：
Magnesium alloy; Strain hardening; Yttrium; Rare-earth element; I-; W- and X-phases; RARE-EARTH-ELEMENTS; MECHANICAL-PROPERTIES; Y ALLOYS; DEFORMATION-BEHAVIOR; TEXTURE EVOLUTION; QUASI-CRYSTALS; MICROSTRUCTURE; AZ31; TWIN; MG-3AL-1ZN;
D O I：
10.1016/j.jallcom.2014.06.211
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 aim of this study was to identify the effect of yttrium (Y) addition on the phase development and strain hardening behavior of an extruded Mg-Zn-Mn (ZM31) magnesium alloy. The addition of a small amount (0.3 wt.%) of Y in the alloy led to the formation of icosahedral quasicrystalline I (Mg3YZn6) phase. Both I-phase and W-phase (Mg3Y2Zn3) were present in the extruded ZM31+3.2Y alloy, while long period stacking ordered (LPSO) X-phase (Mg12YZn) and Mg24Y5 were observed in the extruded ZM31+6Y alloy. The Y addition significantly refined grains in the extruded state. The presence of I-phase in the extruded ZM31+0.3Y alloy increased hardness, compressive yield strength, and Stage B strain hardening rate. The extruded ZM31+3.2Y alloy exhibited a lower hardness and Stage B hardening rate due to the formation of W-phase. Both extruded ZM31+0.3Y and ZM31+3.2Y alloys showed a yield point phenomenon with an initial negative strain hardening rate. The extruded ZM31+6Y alloy had a high hardness and compressive yield strength without Stage B hardening, suggesting a change of major deformation mode from twinning to slip mainly due to the role of LPSO X-phase. After solution treatment and aging, the hardness and compressive yield strength gradually increased with increasing Y content, while the strain hardening exponent and the extent of Stage B strain hardening decreased due to the dissolution of I- and W-phases and the presence of LPSO X-phase. (C) 2014 Elsevier B.V. All rights reserved.
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页码：424 / 432
页数：9
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