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Open AccessArticle

Revealing Nanoindentation Size-Dependent Creep Behavior in a La-Based Metallic Glassy Film

by Yi Ma 1,*,†, Yuxuan Song 1,† and Taihua Zhang 2,*
1
College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310014, China
2
Institute of Solid Mechanics, Beihang University, Beijing 100191, China
*
Authors to whom correspondence should be addressed.
These authors contributed equally to this work
Nanomaterials 2019, 9(12), 1712; https://doi.org/10.3390/nano9121712
Received: 5 August 2019 / Revised: 22 November 2019 / Accepted: 30 November 2019 / Published: 1 December 2019
(This article belongs to the Special Issue Nano Mechanical Testing of Materials and Devices)
We systematically studied nanoindentation size effect on creep deformation in a La-based metallic glassy film, including holding depth effect and indenter size effect. Creep displacement was mainly dependent on both holding strain and deformation volume beneath indenter. Under elastic holding, creep strain was merely holding strain–dependent. While for plastic holding, creep strain was greatly enhanced by adopting smaller indenter and/or decreasing holding depth at the same holding strain. A strong nanoindentation size effect on creep resistance was validated. Strain rate sensitivities (SRS) were calculated, which were obviously higher at elastic regions than at plastic holdings. The relationship between SRS value and creep mechanism in metallic glass was discussed.
Keywords: nanoindentation; creep; metallic glass; size effect; strain rate sensitivity nanoindentation; creep; metallic glass; size effect; strain rate sensitivity
MDPI and ACS Style

Ma, Y.; Song, Y.; Zhang, T. Revealing Nanoindentation Size-Dependent Creep Behavior in a La-Based Metallic Glassy Film. Nanomaterials 2019, 9, 1712.

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