Instrumented indentation of a Pd-based bulk metallic glass: Constant loading-rate test vs constant strain-rate test |
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Authors: | Byung-Gil Yoo Kyung-Woo Lee Jae-il Jang |
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Affiliation: | aDivision of Material Science & Engineering, Hanyang University, Seoul 133-791, Republic of Korea;bDepartment of Material Science & Engineering, Seoul National University, Seoul 151-742, Republic of Korea |
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Abstract: | Most of the previous nanoindentation experiments on bulk metallic glasses (BMGs) were made under a constant ‘loading rate,’ although ‘strain rate’ is a more useful parameter than loading rate to analyze the inhomogeneous plasticity in the BMG according to the classic free-volume theory. Here, we explore the strain-rate dependency of plastic characteristics in a Pd-based BMG through nanoindentation tests under a variety of constant strain rates (0.01–0.25 s−1). The results are compared with those from nanoindentations under various constant loading rates (0.05–5 mN/s) and discussed in terms of the influences of strain rate on the plastic flow characteristics in the BMG. |
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Keywords: | Metallic glasses Nanoindentation Strain rate Hardness |
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