The microstructure and mechanical properties of as-cast Mg-4Y/Nd-2Zn alloys

被引：4

作者：

Liu, Yang ^{[1
]}

Liu, Xiqin ^{[1
,2
]}

Liu, Zili ^{[1
,2
]}

Liu, Guodong ^{[1
]}

Fan, Ruyou ^{[1
]}

Yin, Han ^{[1
]}

Li, Jian ^{[2
,3
]}

机构：

[1] Nanjing Univ Aeronaut & Astronaut, Coll Mat Sci & Technol, Nanjing 210016, Jiangsu, Peoples R China

[2] Jiangsu Zhongyi Engn Res Ctr Light Alloy Precis D, Changshu 215542, Jiangsu, Peoples R China

[3] Jiangsu Favour Automot New Stuff Sci Tech Co Ltd, Changshu, Jiangsu, Peoples R China

来源：

MATERIALS SCIENCE AND TECHNOLOGY | 2018年 / 34卷 / 09期

关键词：

Mg-4Y/Nd-2Zn alloys; Xphase; W phase; microstructure; mechanical properties; Y-ZR ALLOYS; MG-RE ALLOYS; MAGNESIUM ALLOYS; ZN CONTENT; ND; PRECIPITATION; CORROSION; CLUSTERS; METALS; GD;

D O I：

10.1080/02670836.2018.1424796

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Optical microscopy, scanning electron microscopy, X-ray diffraction and tensile testing were performed to investigate the microstructure and mechanical properties of as-cast Mg-4Y/Nd-2Zn alloys. The results show that the secondary dendritic arm spacing for the Mg-4Y-2Zn alloy is smaller than that for the Mg-4Nd-2Zn alloy, and that X-Mg12YZn or W-Mg3Zn3Nd2 form in Mg-4Y/Nd-2Zn alloys. The lamellar X phase distributes at the grain boundary, pointing into the grains, whereas the rod-like W phase preferentially segregates at the triangle junction of the grain boundary. The greater grain boundary strengthening effect and the smaller fragmentation effect of the brittle eutectic phases leads to the as-cast Mg-4Y-2Zn alloy having better comprehensive mechanical properties. The fracture mechanism for as-cast Mg-4Y/Nd-2Zn alloys is quasi-cleavage fracture.

引用

页码：1142 / 1147

页数：6

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