Room-temperature creep and structural relaxation of Mg-Cu-Y metallic glasses

被引：122

作者：

Castellero, A. ^{[1
]}

Moser, B. ^{[2
]}

Uhlenhaut, D. I. ^{[1
]}

Dalla Torre, F. H. ^{[1
]}

Loeffler, J. F. ^{[1
]}

机构：

[1] ETH, Dept Mat, Lab Met Phys & Technol, CH-8093 Zurich, Switzerland

[2] EMPA Mat Sci & Technol, CH-3602 Thun, Switzerland

来源：

ACTA MATERIALIA | 2008年 / 56卷 / 15期

关键词：

metallic glasses; magnesium; nanoindentation; creep test; structural relaxation;

D O I：

10.1016/j.actamat.2008.04.021

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Structural relaxation of Mg-Cu-Y metallic glasses occurs at room-temperature (similar to 0.7 T(g)) and induces an abrupt embrittlement after periods of time that depend oil the relative proportions of Cu and Mg. Internal friction measurements of as-quenched samples show that Mg(65)Cu(25)Y(10) is in a more relaxed state than Mg(85)Cu(5)Y(10), Suggesting a more compact structure for the alloy with a larger amount of Cu, which is the smallest atom in the system. Relaxation spectra, calculated from the anelastic component of nanoindentation creep curves, show that the two alloys are in a similar relaxed state. when they become brittle. The results are discussed in terms of the defects characterizing the disordered structure of the metallic glass. (c) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：3777 / 3785

页数：9

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