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Significant room-temperature plasticity in a high Zr-containing bulk glassy alloy

Published online by Cambridge University Press:  04 May 2020

Shuangshuang Chen*
Affiliation:
School of Materials Science and Engineering, Anhui University of Technology, Ma'anshan 243002, China; and Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials, Anhui University of Technology, Ministry of Education, Ma'anshan 243002, China
Peidi Song
Affiliation:
School of Materials Science and Engineering, Anhui University of Technology, Ma'anshan 243002, China
Dong Xing
Affiliation:
School of Materials Science and Engineering, Anhui University of Technology, Ma'anshan 243002, China
Jiahua Zou*
Affiliation:
School of Management Science and Engineering, Anhui University of Technology, Ma'anshan 243002, China
Xida Deng
Affiliation:
College of Materials Science and Engineering, Shenzhen University, Shenzhen518060, China
Feng Liu
Affiliation:
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
*
a)Address all correspondence to these authors. e-mail: [email protected]
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Abstract

In this study, the glass forming ability, thermal stability, and room-temperature mechanical behavior of a high Zr-containing Zr71Cu11Ni10.5Al7Ti0.5 bulk glassy alloy were investigated. The glassy alloy exhibits a high glass-forming ability with a critical casting diameter of 5 mm using copper mold injection casting, and its critical cooling rate is estimated to be smaller than 40 K/s. A small kinetic fragility index m of 32 indicates its good thermodynamic stability and glass-forming ability. Compressive tests indicate that the glassy alloy displays a significant average plastic strain of 12.3%, a high fracture strength of 1592 MPa, and Young's modulus of 74.5 GPa. The good ductility is attributed to the introduction of more free volume and local compositional inhomogeneity with increasing Zr addition. This finding may provide useful guidelines for the development of novel high Zr-containing glassy alloys.

Type
Novel Synthesis and Processing of Metals
Copyright
Copyright © Materials Research Society 2020

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