Analyses of shear band emission in a Mg-based bulk metallic glass deformed at different nanoindentation rates

S. X. Song; J. S.C. Jang; T. G. Nieh

doi:10.1016/j.intermet.2008.02.001

Analyses of shear band emission in a Mg-based bulk metallic glass deformed at different nanoindentation rates

S. X. Song, J. S.C. Jang, T. G. Nieh

Graduate Institute of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

13 Scopus citations

Abstract

Nanoindentation behavior of Mg₅₇Cu₃₁Y_6.6Nd_5.4 bulk metallic glass was characterized at different loading rates. The load-displacement curves exhibit significant displacement serrations, apparently associated with discrete shear band emission, at low loading rates but disappear at high rates. Analyses based on displacement serration, strain rate serration and hardness serration were carried out to determine the critical strain rate beyond which the transition from inhomogeneous to homogeneous deformation actually took place. It was concluded that the hardness serration analysis probably provides the most reasonable result as the other two were limited by the instrument noises. Based on a shear band nucleation model, the critical nucleus size was estimated to be a sphere of about 25 nm in diameter.

Original language	English
Pages (from-to)	676-681
Number of pages	6
Journal	Intermetallics
Volume	16
Issue number	5
DOIs	https://doi.org/10.1016/j.intermet.2008.02.001
State	Published - May 2008

Keywords

B. Glasses, metallic
B. Mechanical properties at ambient temperature
B. Plastic deformation mechanisms
F. Mechanical testing

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10.1016/j.intermet.2008.02.001

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title = "Analyses of shear band emission in a Mg-based bulk metallic glass deformed at different nanoindentation rates",

abstract = "Nanoindentation behavior of Mg57Cu31Y6.6Nd5.4 bulk metallic glass was characterized at different loading rates. The load-displacement curves exhibit significant displacement serrations, apparently associated with discrete shear band emission, at low loading rates but disappear at high rates. Analyses based on displacement serration, strain rate serration and hardness serration were carried out to determine the critical strain rate beyond which the transition from inhomogeneous to homogeneous deformation actually took place. It was concluded that the hardness serration analysis probably provides the most reasonable result as the other two were limited by the instrument noises. Based on a shear band nucleation model, the critical nucleus size was estimated to be a sphere of about 25 nm in diameter.",

keywords = "B. Glasses, metallic, B. Mechanical properties at ambient temperature, B. Plastic deformation mechanisms, F. Mechanical testing",

author = "Song, {S. X.} and Jang, {J. S.C.} and Nieh, {T. G.}",

note = "Funding Information: This work was supported by the US Department of Energy, Office of Basic Energy Sciences, under contract DE-FG02-06ER46338 with the University of Tennessee. The nanoindentation experiment was performed at the Oak Ridge National Laboratory SHaRE User Facility, sponsored by the U.S. Department of Energy, under contract DE-AC05-00OR22725 with UT-Battelle, LLC.",

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volume = "16",

pages = "676--681",

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T1 - Analyses of shear band emission in a Mg-based bulk metallic glass deformed at different nanoindentation rates

AU - Song, S. X.

AU - Jang, J. S.C.

AU - Nieh, T. G.

N1 - Funding Information: This work was supported by the US Department of Energy, Office of Basic Energy Sciences, under contract DE-FG02-06ER46338 with the University of Tennessee. The nanoindentation experiment was performed at the Oak Ridge National Laboratory SHaRE User Facility, sponsored by the U.S. Department of Energy, under contract DE-AC05-00OR22725 with UT-Battelle, LLC.

PY - 2008/5

Y1 - 2008/5

N2 - Nanoindentation behavior of Mg57Cu31Y6.6Nd5.4 bulk metallic glass was characterized at different loading rates. The load-displacement curves exhibit significant displacement serrations, apparently associated with discrete shear band emission, at low loading rates but disappear at high rates. Analyses based on displacement serration, strain rate serration and hardness serration were carried out to determine the critical strain rate beyond which the transition from inhomogeneous to homogeneous deformation actually took place. It was concluded that the hardness serration analysis probably provides the most reasonable result as the other two were limited by the instrument noises. Based on a shear band nucleation model, the critical nucleus size was estimated to be a sphere of about 25 nm in diameter.

AB - Nanoindentation behavior of Mg57Cu31Y6.6Nd5.4 bulk metallic glass was characterized at different loading rates. The load-displacement curves exhibit significant displacement serrations, apparently associated with discrete shear band emission, at low loading rates but disappear at high rates. Analyses based on displacement serration, strain rate serration and hardness serration were carried out to determine the critical strain rate beyond which the transition from inhomogeneous to homogeneous deformation actually took place. It was concluded that the hardness serration analysis probably provides the most reasonable result as the other two were limited by the instrument noises. Based on a shear band nucleation model, the critical nucleus size was estimated to be a sphere of about 25 nm in diameter.

KW - B. Glasses, metallic

KW - B. Mechanical properties at ambient temperature

KW - B. Plastic deformation mechanisms

KW - F. Mechanical testing

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U2 - 10.1016/j.intermet.2008.02.001

DO - 10.1016/j.intermet.2008.02.001

M3 - 期刊論文

AN - SCOPUS:41949121674

VL - 16

SP - 676

EP - 681

JO - Intermetallics

JF - Intermetallics

SN - 0966-9795

IS - 5

ER -

Analyses of shear band emission in a Mg-based bulk metallic glass deformed at different nanoindentation rates

Abstract

Keywords

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