Intermediate Temperature Brittleness in Metallic Glasses

Chao Wang; Qing Ping Cao; Xiao Dong Wang; Dong Xian Zhang; Upadrasta Ramamurty; Ramasubramanian Lakshmi Narayan; Jian-Zhong Jiang

doi:10.1002/adma.201605537

Intermediate Temperature Brittleness in Metallic Glasses

Adv Mater. 2017 Apr;29(14). doi: 10.1002/adma.201605537. Epub 2017 Feb 9.

Authors

Chao Wang¹, Qing Ping Cao¹, Xiao Dong Wang¹, Dong Xian Zhang¹, Upadrasta Ramamurty^{1

2

3}, Ramasubramanian Lakshmi Narayan⁴, Jian-Zhong Jiang¹

Affiliations

¹ International Center for New-Structured Materials (ICNSM), Zhejiang University and Laboratory of New-Structured Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, P. R. China.
² Department of Materials Engineering, Indian Institute of Science, Bangalore, 560012, India.
³ Center of Excellence for Advanced Materials Research, King Abdulaziz University, Jeddah, 21589, Saudi Arabia.
⁴ Department of Materials Science and Engineering, Carnegie Mellon University, Pittsburgh, PA, 15213, USA.

PMID: 28181309
DOI: 10.1002/adma.201605537

Abstract

All metallic glasses (MGs), irrespective of their compositions, become brittle in the intermediate temperature range of 0.6-0.7 T_g However, most materials are expected to carry higher strains during deformation with increasing temperature. This behavior of MGs is explained by describing the competition between shear banding and diffusive relaxation processes, and is reminiscent of the "intermediate temperature ductility minimum" observed in polycrystalline metals.

Keywords: ductility; metallic glass; shear bands.