Effect of Sn addition on the microstructure and deformation behavior of Mg-3Al alloy

被引：146
作者：
Suh, Byeong-Chan [1 ,2 ]
Kim, Jae H. [1 ]
Bae, Jun Ho [3 ]
Hwang, Ji Hyun [1 ]
Shim, Myeong-Shik [1 ]
Kim, Nack J. [1 ]
机构：
[1] Pohang Univ Sci & Technol POSTECH, GIFT, Pohang 790784, South Korea
[2] Natl Inst Mat Sci, Res Ctr Magnet & Spintron Mat, Tsukuba, Ibaraki 3050047, Japan
[3] KIMS, Light Met Res Grp, Chang Won 641831, South Korea
来源：
ACTA MATERIALIA | 2017年 / 124卷
关键词：
Magnesium alloys; Formability; Dislocations; Polycrystal plasticity modeling; STACKING-FAULT ENERGY; MG-BASED ALLOYS; STRETCH FORMABILITY; ROOM-TEMPERATURE; TEXTURE EVOLUTION; TENSILE PROPERTIES; MECHANICAL-PROPERTIES; MAGNESIUM ALLOYS; ZN; SHEET;
D O I：
10.1016/j.actamat.2016.11.020
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Mg alloys generally suffer from their poor formability at low temperatures due to their strong basal texture and a lack of adequate deformation systems. In the present study, a small amount of Sn was added instead of Zn to Mg-3Al alloy to modify its deformation behavior and improve the stretch formability. Microstructural examinations of the deformed Mg-3Al-1Sn (AT31) alloy by electron back scatter diffraction and transmission electron microscopy show that prismatic <a> slip is quite active during deformation, resulting in much lower r-values and planar anisotropy than the counterpart Mg-3Al-1Zn (AZ31) alloy. Polycrystal plasticity simulation based on visco-plasticity self-consistent (VPSC) model also shows that prismatic <a> slip is the dominant deformation mode in AT31 alloy besides basal <a> slip. As a consequence, AT31 alloy shows a much higher stretch formability than AZ31 alloy. On the other hand, AZ31 alloy shows the development of intense shear bands during stretch forming, and these shear bands act as crack propagating paths, limiting the stretch formability of AZ31 alloy. (c) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：268 / 279
页数：12
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