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Co-based ternary bulk metallic glasses with ultrahigh strength and plasticity

Published online by Cambridge University Press:  13 July 2011

Jianfeng Wang ,
Ran Li ,
Nengbin Hua  and
Tao Zhang
Jianfeng Wang
Affiliation:
Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Material Science and Engineering, Beihang University, Beijing 100191, People’s Republic of China
Ran Li*
Affiliation:
Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Material Science and Engineering, Beihang University, Beijing 100191, People’s Republic of China
Nengbin Hua
Affiliation:
Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Material Science and Engineering, Beihang University, Beijing 100191, People’s Republic of China
Tao Zhang*
Affiliation:
Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Material Science and Engineering, Beihang University, Beijing 100191, People’s Republic of China
*
a)Address all correspondence to these authors. e-mail: liran@buaa.edu.cn
b)e-mail: zhangtao@buaa.edu.cn
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Abstract

A family of ultrahigh strength Co-based bulk metallic glasses (BMGs) with critical diameters up to 2 mm is synthesized in Co65–xTaxB35 (at.%, x = 5–10) alloys by copper mold casting. The improved glass-forming ability associated with near eutectic compositions is attributed to the appropriate addition of Ta. The glassy alloys exhibit high glass transition temperature of 930–975 K, ultrahigh compressive strength of 5.6–6.0 GPa, high specific strength of 639–654 N·m/g, Vickers hardness of 15–16 GPa, and distinct plastic strain of 0.5–1.5%. The strength and the specific strength are the highest values reported for bulk metallic materials known so far. Several universal criteria correlated with the thermal properties, elastic constants, and mechanical properties were validated in the Co-based BMG system. These Co–Ta–B BMGs combining with superior mechanical properties, high thermal stability, and simple elemental composition are significant for scientific research as modeling materials and industrial application as advanced structural materials.

Keywords

CoElastic propertiesAmorphous
Type
Articles
Information
Journal of Materials Research , Volume 26 , Issue 16 , 28 August 2011 , pp. 2072 - 2079
Copyright
Copyright © Materials Research Society 2011

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