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Metals 2016, 6(1), 12; doi:10.3390/met6010012

Investigation of Elastic Deformation Mechanism in As-Cast and Annealed Eutectic and Hypoeutectic Zr–Cu–Al Metallic Glasses by Multiscale Strain Analysis

1
Quantum Beam Science Center, Japan Atomic Energy Agency, Tokai, Naka, Ibaraki 319-1195, Japan
2
Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, Sendai, Miyagi 980-8578, Japan
3
Faculty of Engineering, Tokyo City University, Setagaya, Tokyo 158-8857, Japan
4
Graduate School of Science and Engineering, Ibaraki University, Hitachi, Ibaraki 316-8511, Japan
5
Quantum Beam Science Center, Japan Atomic Energy Agency, Sayo, Hyogo 679-5148, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: Klaus-Dieter Liss
Received: 24 November 2015 / Revised: 23 December 2015 / Accepted: 30 December 2015 / Published: 5 January 2016
(This article belongs to the Special Issue Metals Challenged by Neutron and Synchrotron Radiation)
View Full-Text   |   Download PDF [2782 KB, uploaded 5 January 2016]   |  

Abstract

Elastic deformation behaviors of as-cast and annealed eutectic and hypoeutectic Zr–Cu–Al bulk metallic glasses (BMG) were investigated on a basis of different strain-scales, determined by X-ray scattering and the strain gauge. The microscopic strains determined by Direct-space method and Reciprocal-space method were compared with the macroscopic strain measured by the strain gauge, and the difference in the deformation mechanism between eutectic and hypoeutectic Zr–Cu–Al BMGs was investigated by their correlation. The eutectic Zr50Cu40Al10 BMG obtains more homogeneous microstructure by free-volume annihilation after annealing, improving a resistance to deformation but degrading ductility because of a decrease in the volume fraction of weakly-bonded regions with relatively high mobility. On the other hand, the as-cast hypoeutectic Zr60Cu30Al10 BMG originally has homogeneous microstructure but loses its structural and elastic homogeneities because of nanocluster formation after annealing. Such structural changes by annealing might develop unique mechanical properties showing no degradations of ductility and toughness for the structural-relaxed hypoeutectic Zr60Cu30Al10 BMGs. View Full-Text
Keywords: hypoeutectic Zr–Cu–Al bulk metallic glass; structural relaxation; X-ray scattering; pair distribution function; elastic modulus hypoeutectic Zr–Cu–Al bulk metallic glass; structural relaxation; X-ray scattering; pair distribution function; elastic modulus
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MDPI and ACS Style

Suzuki, H.; Yamada, R.; Tsubaki, S.; Imafuku, M.; Sato, S.; Watanuki, T.; Machida, A.; Saida, J. Investigation of Elastic Deformation Mechanism in As-Cast and Annealed Eutectic and Hypoeutectic Zr–Cu–Al Metallic Glasses by Multiscale Strain Analysis. Metals 2016, 6, 12.

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