Formation, microstructure, and mechanical properties of in situ Mg-Ni-(Gd,Nd) bulk metallic glass composite

被引：13

作者：

Yin, Jian ^{[1
]}

Yuan, Guangyin ^{[1
,2
]}

Chu, Zhenhua ^{[1
]}

Zhang, Jian ^{[1
]}

Ding, Wenjiang ^{[1
,2
]}

机构：

[1] Shanghai Jiao Tong Univ, Natl Engn Res Ctr Light Alloy Net Forming, Shanghai 200240, Peoples R China

[2] Shanghai Jiao Tong Univ, State Key Lab Metall Matrix Composites, Shanghai 200240, Peoples R China

来源：

JOURNAL OF MATERIALS RESEARCH | 2009年 / 24卷 / 12期

基金：

中国国家自然科学基金;

关键词：

PERIOD ORDERED STRUCTURE; FORMING ABILITY; HIGH-STRENGTH; AMORPHOUS-ALLOYS; PLASTICITY; DUCTILITY; TENSILE; ND;

D O I：

10.1557/JMR.2009.0438

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Based on a ternary Mg75Ni15Gd10 metallic glass former, a new Mg80Ni12Gd4Nd4 bulk metallic glass composite (BMGC) was developed by tailoring the compositions of Mg and rare earth (RE) elements. This BMGC displayed compressive ultimate strength over 900 MPa with a total strain to failure of 4.3% and specific strength of 3.12 x 10(5) Nm/kg. The improved mechanical properties were attributed to a "dual phases" structure consisting of Mg solid solution flakes and glassy matrix in the Mg80Ni12Gd4Nd4 BMGC. The homogeneously dispersed Mg phases reinforcement in the BMGC were characterized as a long period ordered structure (LPOS) with periodic arrays of six close-packed planes distorted from the ideal hexagonal lattice of 6H-type. The LPOS-Mg in the composite can act as a soft media to trap or interact with the unstable shear bands and contribute to plastic strain. The present study may provide a guideline for designing the Mg-TM-RE-based (TM: transition metals) BMGCs with "dual phases" structures.

引用

页码：3603 / 3610

页数：8

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