On the thermodynamics, kinetics, and sub-Tg relaxations of Mg-based bulk metallic glasses

被引：37

作者：

Frey, Maximilian ^{[1
]}

Busch, Ralf ^{[1
]}

Possart, Wulff ^{[2
]}

Gallino, Isabella ^{[1
]}

机构：

[1] Saarland Univ, Chair Metall Mat, Campus C6-3, D-66123 Saarbrucken, Germany

[2] Saarland Univ, Chair Adhes & Interphases Polymers, Campus C6-3, D-66123 Saarbrucken, Germany

来源：

ACTA MATERIALIA | 2018年 / 155卷

关键词：

Bulk metallic glasses; Mg-based alloy; Fragility; alpha-relaxation; beta-relaxation; SLOW SECONDARY RELAXATION; FORMING ABILITY; CU-Y; AMORPHOUS-ALLOYS; AG ADDITION; TRANSITION; LIQUIDS; FABRICATION; VISCOSITY; FRAGILITY;

D O I：

10.1016/j.actamat.2018.05.063

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The four Mg-based bulk metallic glass forming alloys Mg(59.5)Cu(22.9)A(86.6)Gd(11), Mg61Cu28Gd11,Mg(54)Cu(28)AP(7)Y(11), and Mg65Cu25Y10 are investigated to gain insight into their thermodynamic and kinetic properties. Differential scanning calorimetry (DSC) and thermomechanical analysis (TMA) in three point beam bending mode are used. The gathered data sets are used to evaluate the origin of the high glass forming ability of these systems, which is found in low thermodynamic driving forces for crystallization and sluggish kinetics. Furthermore, sub-Tg effects are observed via dynamic mechanical analysis (DMA) and modulated differential scanning calorimetry (MDSC) of as-cast samples. These are interpreted as related to the cc relaxation time spectrum instead of being caused by a Johari-Goldstein-type relaxation mechanism. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：117 / 127

页数：11

共 67 条

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