Abstract

One of the challenges in the applications of instrumented indentation is to simultaneously measure elastic modulus and Poisson’s ratio of homogeneous, isotropic materials. This work proposes empirical equations for simultaneous calculation of elastic modulus and Poisson’s ratio of bulk metallic glasses (BMGs) from the ratio of the short diagonal length to the long diagonal length and the area of the Knoop imprint. The parameters pre- sented in the empirical equations are determined first by Knoop microhardness tests of 24 BMGs, whose elastic moduli and Poisson’s ratios are measured by resonant ultrasound spectroscopy. These empirical equations are further validated by the Knoop microhardness tests of other 3 BMGs, which yield elastic moduli and Poisson’s ratios in good accordance with the corresponding ones available in the literature and with the results from nanoindentation tests. This work opens a new venue of Knoop microhardness test as an economical and efficient method to measure both elastic modulus and Poisson’s ratio of BMGs.

Document Type

Article

Publication Date

1-2024

Notes/Citation Information

2238-7854/© 2024 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

Digital Object Identifier (DOI)

https://doi.org/10.1016/j.jmrt.2024.01.046

Funding Information

ML is grateful for the support by National Natural Science Founda- tion of China (Grant No. 51705082), Fujian Provincial Minjiang Scholar Program (Grant No. 0020-510759), Qishan Sholar program in Fuzhou University (Grant No. 0020-650289), Fuzhou University Testing Fund of precious apparatus (Grant No. 2023T018).

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