Plasticity and structural instability in a bulk metallic glass deformed in the supercooled liquid region

T. G. Nieh; J. Wadsworth; C. T. Liu; T. Ohkubo; Y. Hirotsu

doi:10.1016/S1359-6454(01)00218-X

Plasticity and structural instability in a bulk metallic glass deformed in the supercooled liquid region

T. G. Nieh, J. Wadsworth, C. T. Liu, T. Ohkubo, Y. Hirotsu

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

218 Citations (Scopus)

Abstract

The deformation behavior of a bulk amorphous Zr-10Al-5Ti-17.9Cu-14.6Ni alloy was characterized in the supercooled liquid region. The alloy was observed to exhibit Newtonian behavior at low strain rates but to become non-Newtonian at high strain rates. Structures of the amorphous material, both before and after deformation, were examined using X-ray diffraction and high-resolution electron microscopy. Experimental results showed the presence of nanocrystallites in the deformed samples, suggesting that the non-Newtonian behavior was associated with the concurrent crystallization of the amorphous structure during deformation; that is, a mixed crystalline-plus-amorphous structure was being tested. A mechanistic model based upon structural evolution has been developed to interpret the observed non-Newtonian behavior. © 2001 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.

Original language	English
Pages (from-to)	2887-2896
Journal	Acta Materialia
Volume	49
Issue number	15
DOIs	https://doi.org/10.1016/S1359-6454(01)00218-X
Publication status	Published - 3 Sept 2001
Externally published	Yes

Research Keywords

Amorphous materials
Metallic glasses
Superplasticity

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10.1016/S1359-6454(01)00218-X

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title = "Plasticity and structural instability in a bulk metallic glass deformed in the supercooled liquid region",

abstract = "The deformation behavior of a bulk amorphous Zr-10Al-5Ti-17.9Cu-14.6Ni alloy was characterized in the supercooled liquid region. The alloy was observed to exhibit Newtonian behavior at low strain rates but to become non-Newtonian at high strain rates. Structures of the amorphous material, both before and after deformation, were examined using X-ray diffraction and high-resolution electron microscopy. Experimental results showed the presence of nanocrystallites in the deformed samples, suggesting that the non-Newtonian behavior was associated with the concurrent crystallization of the amorphous structure during deformation; that is, a mixed crystalline-plus-amorphous structure was being tested. A mechanistic model based upon structural evolution has been developed to interpret the observed non-Newtonian behavior. {\textcopyright} 2001 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.",

keywords = "Amorphous materials, Metallic glasses, Superplasticity",

author = "Nieh, {T. G.} and J. Wadsworth and Liu, {C. T.} and T. Ohkubo and Y. Hirotsu",

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TY - JOUR

T1 - Plasticity and structural instability in a bulk metallic glass deformed in the supercooled liquid region

AU - Nieh, T. G.

AU - Wadsworth, J.

AU - Liu, C. T.

AU - Ohkubo, T.

AU - Hirotsu, Y.

PY - 2001/9/3

Y1 - 2001/9/3

N2 - The deformation behavior of a bulk amorphous Zr-10Al-5Ti-17.9Cu-14.6Ni alloy was characterized in the supercooled liquid region. The alloy was observed to exhibit Newtonian behavior at low strain rates but to become non-Newtonian at high strain rates. Structures of the amorphous material, both before and after deformation, were examined using X-ray diffraction and high-resolution electron microscopy. Experimental results showed the presence of nanocrystallites in the deformed samples, suggesting that the non-Newtonian behavior was associated with the concurrent crystallization of the amorphous structure during deformation; that is, a mixed crystalline-plus-amorphous structure was being tested. A mechanistic model based upon structural evolution has been developed to interpret the observed non-Newtonian behavior. © 2001 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.

AB - The deformation behavior of a bulk amorphous Zr-10Al-5Ti-17.9Cu-14.6Ni alloy was characterized in the supercooled liquid region. The alloy was observed to exhibit Newtonian behavior at low strain rates but to become non-Newtonian at high strain rates. Structures of the amorphous material, both before and after deformation, were examined using X-ray diffraction and high-resolution electron microscopy. Experimental results showed the presence of nanocrystallites in the deformed samples, suggesting that the non-Newtonian behavior was associated with the concurrent crystallization of the amorphous structure during deformation; that is, a mixed crystalline-plus-amorphous structure was being tested. A mechanistic model based upon structural evolution has been developed to interpret the observed non-Newtonian behavior. © 2001 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.

KW - Amorphous materials

KW - Metallic glasses

KW - Superplasticity

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UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-0035801927&origin=recordpage

U2 - 10.1016/S1359-6454(01)00218-X

DO - 10.1016/S1359-6454(01)00218-X

M3 - RGC 21 - Publication in refereed journal

SN - 1359-6454

VL - 49

SP - 2887

EP - 2896

JO - Acta Materialia

JF - Acta Materialia

IS - 15

ER -

Plasticity and structural instability in a bulk metallic glass deformed in the supercooled liquid region

Abstract

Research Keywords

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