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Title: Thermal activation in Au-based bulk metallic glass characterized by high-temperature nanoindentation

Abstract

High-temperature nanoindentation experiments have been conducted on a Au{sub 49}Ag{sub 5.5}Pd{sub 2.3}Cu{sub 26.9}Si{sub 16.3} bulk metallic glass from 30 to 140 deg. C, utilizing loading rates ranging from 0.1 to 100 mN/s. Generally, the hardness decreased with increasing temperature. An inhomogeneous-to-homogeneous flow transition was clearly observed when the test temperature approached the glass transition temperature. Analyses of the pop-in pattern and hardness variation showed that the inhomogeneous-to-homogeneous transition temperature was loading-rate dependent. Using a free-volume model, the authors deduced the size of the basic flow units and the activation energy for the homogeneous flow. In addition, the strain rate dependency of the transition temperature was predicted.

Authors:
; ;  [1];  [2];  [2]
  1. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)
  2. (United States)
Publication Date:
OSTI Identifier:
20971809
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 90; Journal Issue: 6; Other Information: DOI: 10.1063/1.2459383; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ACTIVATION ENERGY; COPPER ALLOYS; GOLD ALLOYS; HARDNESS; LOADING RATE; METALLIC GLASSES; PALLADIUM ALLOYS; SILICON ALLOYS; SILVER ALLOYS; STRAIN RATE; TEMPERATURE RANGE 0273-0400 K; TRANSITION TEMPERATURE

Citation Formats

Yang Bing, Wadsworth, Jeffrey, Nieh, Tai-Gang, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6115, and Department of Materials Science and Engineering, The University of Tennessee, Knoxville, Tennessee 37996. Thermal activation in Au-based bulk metallic glass characterized by high-temperature nanoindentation. United States: N. p., 2007. Web. doi:10.1063/1.2459383.
Yang Bing, Wadsworth, Jeffrey, Nieh, Tai-Gang, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6115, & Department of Materials Science and Engineering, The University of Tennessee, Knoxville, Tennessee 37996. Thermal activation in Au-based bulk metallic glass characterized by high-temperature nanoindentation. United States. doi:10.1063/1.2459383.
Yang Bing, Wadsworth, Jeffrey, Nieh, Tai-Gang, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6115, and Department of Materials Science and Engineering, The University of Tennessee, Knoxville, Tennessee 37996. Mon . "Thermal activation in Au-based bulk metallic glass characterized by high-temperature nanoindentation". United States. doi:10.1063/1.2459383.
@article{osti_20971809,
title = {Thermal activation in Au-based bulk metallic glass characterized by high-temperature nanoindentation},
author = {Yang Bing and Wadsworth, Jeffrey and Nieh, Tai-Gang and Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6115 and Department of Materials Science and Engineering, The University of Tennessee, Knoxville, Tennessee 37996},
abstractNote = {High-temperature nanoindentation experiments have been conducted on a Au{sub 49}Ag{sub 5.5}Pd{sub 2.3}Cu{sub 26.9}Si{sub 16.3} bulk metallic glass from 30 to 140 deg. C, utilizing loading rates ranging from 0.1 to 100 mN/s. Generally, the hardness decreased with increasing temperature. An inhomogeneous-to-homogeneous flow transition was clearly observed when the test temperature approached the glass transition temperature. Analyses of the pop-in pattern and hardness variation showed that the inhomogeneous-to-homogeneous transition temperature was loading-rate dependent. Using a free-volume model, the authors deduced the size of the basic flow units and the activation energy for the homogeneous flow. In addition, the strain rate dependency of the transition temperature was predicted.},
doi = {10.1063/1.2459383},
journal = {Applied Physics Letters},
number = 6,
volume = 90,
place = {United States},
year = {Mon Feb 05 00:00:00 EST 2007},
month = {Mon Feb 05 00:00:00 EST 2007}
}