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Description:

The small-scale plasticity and creep behavior of an annealed Zr50Cu40Al10 bulk metallic glass (BMG) were investigated using nanoindentation testing. Four load functions, differing only in their holding times of 0, 10, 30, and 60 s at peak load, were applied. The results show that the BMG exhibits spatially heterogeneous and time-sensitive plastic behavior. Specifically, the elastic energy contribution remains consistent across all holding times, and both the average value and standard deviation of plastic energy increase with longer holding times. Machine learning clustering based on hardness and creep displacement suggested three clusters and the 60-s holding time measurements were analyzed further. Creep analysis showed nearly constant non-linear behavior across clusters, with a linear term emerging at larger creep displacements and an increasing time-dependency coefficient. The cluster with the greatest creep displacements also exhibited the largest plastic energy. Statistical analysis of the distribution of plastic energy values facilitated the identification of potential deformation mechanisms within the clusters.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: nanoindentation

Date published: 2025-08-23

Publisher: Elsevier BV

Journal:

• Journal of Materials Research and Technology (ISSN: 22387854) vol. 38 p. 3464-3471

Funding:

• Government of Japan Ministry of Education Culture Sports Science and Technology

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1016/j.jmrt.2025.08.135

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Updated at: 2025-12-12 08:30:17 +0900

Published on MDR: 2025-12-12 08:24:08 +0900