Structures of Al2Sm phase in a high-pressure die-cast Mg-4Al-4Sm-0.3Mn alloy

被引：27

作者：

Yang, Qiang ^{[1
]}

Guan, Kai ^{[1
,4
]}

Qiu, Xin ^{[1
]}

Zhang, Deping ^{[1
]}

Lv, Shuhui ^{[2
]}

Su, Fanqiang ^{[1
,4
]}

Zhang, Yaqin ^{[3
]}

Liu, Xiaojuan ^{[1
]}

Meng, Jian ^{[1
]}

机构：

[1] Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Rare Earth Resource Utilizat, Changchun 130022, Peoples R China

[2] Changchun Univ Sci & Technol, Sch Mat Sci & Engn, Changchun 130022, Peoples R China

[3] Kashui Int Holdings Ltd, Shenzhen 518111, Guangdong, Peoples R China

[4] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2016年 / 675卷

基金：

中国国家自然科学基金; 日本学术振兴会;

关键词：

Transmission electron microscopy (TEM); Magnesium alloys; Twinning; Heterogeneous nucleation; MECHANICAL-PROPERTIES; CORROSION BEHAVIOR;

D O I：

10.1016/j.msea.2016.08.066

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The structures of a petaloid phase, which acts as the dominant intermetallic phase in a high-pressure die-cast Mg-4Al-4Sm-0.3Mn alloy with outstanding ductility and strength, were thoroughly studied in this work. The results indicate that the petaloid phase is Al2Sm phase (face-centered cubic structure: a=0.7945 nm), not Al11Sm3, and composed of multiple (111) twins with the (111) plane serving as the twinning plane. However, most (111) twins are extraordinarily different from the conventional one, featuring a sandwiched structure with the filling being Al12Sm2Mn5 phase. Nevertheless, the appearance of Al12Sm2Mn5 bands is not always accompanied with twins. Finally, the underlying mechanisms for the peculiar Al2Sm structures were carefully discussed and revealed as a random heterogeneous nucleation of the Al2Sm phase on the pre-existed Al12Sm2Mn5 sites during solidification. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：396 / 402

页数：7

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