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

Published online by Cambridge University Press:  31 January 2011

Jian Yin ,
Guangyin Yuan ,
Zhenhua Chu ,
Jian Zhang  and
W.J. Ding
Jian Yin
Affiliation:
National Engineering Research Center of Light Alloy Net Forming, Shanghai Jiaotong University, Shanghai 200240, China
Guangyin Yuan*
Affiliation:
National Engineering Research Center of Light Alloy Net Forming, Shanghai Jiaotong University, Shanghai 200240, China; and State Key Laboratory of Metallic Matrix Composites, Shanghai Jiaotong University, Shanghai 200240, China
Jian Zhang
Affiliation:
National Engineering Research Center of Light Alloy Net Forming, Shanghai Jiaotong University, Shanghai 200240, China
W.J. Ding
Affiliation:
National Engineering Research Center of Light Alloy Net Forming, Shanghai Jiaotong University, Shanghai 200240, China; and State Key Laboratory of Metallic Matrix Composites, Shanghai Jiaotong University, Shanghai 200240, China
*
a) Address all correspondence to this author. e-mail: gyyuan@sjtu.edu.cn
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Abstract

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 × 105 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.

Keywords

AmorphousCompositeMg
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 12 , December 2009 , pp. 3603 - 3610
Copyright
Copyright © Materials Research Society 2009

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