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Origin of the Simultaneous Improvement of Strength and Plasticity in Ti-based Bulk Metallic Glass Matrix Composites

Published online by Cambridge University Press:  03 March 2011

Yu Chan Kim ,
Eric Fleury ,
Jae-Chul Lee  and
Do Hyang Kim
Yu Chan Kim*
Affiliation:
Division of Materials Science and Engineering, Korea Institute of Science and Technology, Cheongryang, Seoul 130-650, Korea
Eric Fleury
Affiliation:
Division of Materials Science and Engineering, Korea Institute of Science and Technology, Cheongryang, Seoul 130-650, Korea
Jae-Chul Lee
Affiliation:
Division of Materials Science and Engineering, Korea University, Seoul 136-701, Korea
Do Hyang Kim
Affiliation:
Center for Non-crystalline Materials, Department of Metallurgical Engineering, Yonsei University, Seoul 120-749, Korea
*
a) Address all correspondence to this author. e-mail: chany@kist.re.kr
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Abstract

W-rich particle-reinforced Ti-based bulk metallic glass (BMG) matrix composites with a compressive strength approaching 3 GPa and a fracture strain of approximately 12% were developed. In contrast to most existing BMG matrix composites, in which the improved ductility was obtained only at the expense of the strength, the composites developed in this study exhibited a significant enhancement in their strength, as well as an improvement in the plasticity. This improvement in the plasticity was attributed to the blocking and circumscription of the shear band propagation, leading to the formation of a large number of shear bands. Using a classical elasticity theory of inclusions, the improvement of the strength was interpreted as resulting from the generation of tensile residual stresses in the matrix due to the difference in the coefficient of thermal expansion between the W-rich particles and the BMG matrix.

Keywords

CompositeMechanical propertiesMetallic glass

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Type
Articles
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Journal of Materials Research , Volume 20 , Issue 9 , September 2005 , pp. 2474 - 2479
Copyright
Copyright © Materials Research Society 2005

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