Distinctive slow β relaxation and structural heterogeneity in (LaCe)-based metallic glass

W. Zhai; C. H. Wang; J. C. Qiao; J. M. Pelletier; F. P. Dai; B. Wei

doi:10.1016/j.jallcom.2018.01.237

Distinctive slow β relaxation and structural heterogeneity in (LaCe)-based metallic glass

W. Zhai, C. H. Wang, J. C. Qiao, J. M. Pelletier, F. P. Dai, B. Wei

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

13 Scopus citations

Abstract

The (LaCe)_32.5Co₂₀Al₁₅ bulk metallic glass was found to display a pronounced slow β-relaxation at low temperature, which was well separated by α-relaxation based on the mechanical spectroscopy. The activation energy for α-relaxation E_α is 335 kJ/mol, and this process revealed in the master curve can be well fitted by a Kohlrausch-Williams-Watts (KWW) function with γ_KWW value of 0.463. The activation energy for the slow β-relaxation E_β is determined to be 76 kJ/mol, which obeys an empirical rule that E_β equals 22RT_g. The dynamic mechanical behavior of this metallic glass can be well explained by quasi-point defects (QPDs) theory. The correlation factor χ is deduced to be 0.44 from the experimental results, which suggests remarkable heterogeneity in this (LaCe)-based metallic glass. This closely relates to the origin of the prominent slow β-relaxation.

Original language	English
Pages (from-to)	536-541
Number of pages	6
Journal	Journal of Alloys and Compounds
Volume	742
DOIs	https://doi.org/10.1016/j.jallcom.2018.01.237
State	Published - 25 Apr 2018

Keywords

Dynamic mechanical property
Metallic glass
α relaxation
β relaxation

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10.1016/j.jallcom.2018.01.237

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title = "Distinctive slow β relaxation and structural heterogeneity in (LaCe)-based metallic glass",

abstract = "The (LaCe)32.5Co20Al15 bulk metallic glass was found to display a pronounced slow β-relaxation at low temperature, which was well separated by α-relaxation based on the mechanical spectroscopy. The activation energy for α-relaxation Eα is 335 kJ/mol, and this process revealed in the master curve can be well fitted by a Kohlrausch-Williams-Watts (KWW) function with γKWW value of 0.463. The activation energy for the slow β-relaxation Eβ is determined to be 76 kJ/mol, which obeys an empirical rule that Eβ equals 22RTg. The dynamic mechanical behavior of this metallic glass can be well explained by quasi-point defects (QPDs) theory. The correlation factor χ is deduced to be 0.44 from the experimental results, which suggests remarkable heterogeneity in this (LaCe)-based metallic glass. This closely relates to the origin of the prominent slow β-relaxation.",

keywords = "Dynamic mechanical property, Metallic glass, α relaxation, β relaxation",

author = "W. Zhai and Wang, {C. H.} and Qiao, {J. C.} and Pelletier, {J. M.} and Dai, {F. P.} and B. Wei",

note = "Publisher Copyright: {\textcopyright} 2018 Elsevier B.V.",

year = "2018",

month = apr,

day = "25",

doi = "10.1016/j.jallcom.2018.01.237",

language = "英语",

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TY - JOUR

T1 - Distinctive slow β relaxation and structural heterogeneity in (LaCe)-based metallic glass

AU - Zhai, W.

AU - Wang, C. H.

AU - Qiao, J. C.

AU - Pelletier, J. M.

AU - Dai, F. P.

AU - Wei, B.

PY - 2018/4/25

Y1 - 2018/4/25

N2 - The (LaCe)32.5Co20Al15 bulk metallic glass was found to display a pronounced slow β-relaxation at low temperature, which was well separated by α-relaxation based on the mechanical spectroscopy. The activation energy for α-relaxation Eα is 335 kJ/mol, and this process revealed in the master curve can be well fitted by a Kohlrausch-Williams-Watts (KWW) function with γKWW value of 0.463. The activation energy for the slow β-relaxation Eβ is determined to be 76 kJ/mol, which obeys an empirical rule that Eβ equals 22RTg. The dynamic mechanical behavior of this metallic glass can be well explained by quasi-point defects (QPDs) theory. The correlation factor χ is deduced to be 0.44 from the experimental results, which suggests remarkable heterogeneity in this (LaCe)-based metallic glass. This closely relates to the origin of the prominent slow β-relaxation.

AB - The (LaCe)32.5Co20Al15 bulk metallic glass was found to display a pronounced slow β-relaxation at low temperature, which was well separated by α-relaxation based on the mechanical spectroscopy. The activation energy for α-relaxation Eα is 335 kJ/mol, and this process revealed in the master curve can be well fitted by a Kohlrausch-Williams-Watts (KWW) function with γKWW value of 0.463. The activation energy for the slow β-relaxation Eβ is determined to be 76 kJ/mol, which obeys an empirical rule that Eβ equals 22RTg. The dynamic mechanical behavior of this metallic glass can be well explained by quasi-point defects (QPDs) theory. The correlation factor χ is deduced to be 0.44 from the experimental results, which suggests remarkable heterogeneity in this (LaCe)-based metallic glass. This closely relates to the origin of the prominent slow β-relaxation.

KW - Dynamic mechanical property

KW - Metallic glass

KW - α relaxation

KW - β relaxation

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U2 - 10.1016/j.jallcom.2018.01.237

DO - 10.1016/j.jallcom.2018.01.237

M3 - 文章

AN - SCOPUS:85041570901

SN - 0925-8388

VL - 742

SP - 536

EP - 541

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

ER -

Distinctive slow β relaxation and structural heterogeneity in (LaCe)-based metallic glass

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Keywords

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