Phase separation and microstructure evolution of rapidly quenched Gd-Hf-Co-Al alloys

被引：21

作者：

Han, J. H. ^{[1
,2
]}

Mattern, N. ^{[1
]}

Kim, D. H. ^{[3
]}

Eckert, J. ^{[1
,2
]}

机构：

[1] IFW Dresden, Inst Complex Mat, D-01069 Dresden, Germany

[2] Tech Univ Dresden, Inst Mat Sci, D-01069 Dresden, Germany

[3] Yonsei Univ, Ctr Noncrystalline Mat, Seoul 120749, South Korea

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2011年 / 509卷

关键词：

Phase separation; Metallic glass; Spinodal decomposition; BULK METALLIC GLASSES; MECHANICAL-PROPERTIES; FORMING ABILITY; PLASTICITY; COMPOSITES;

D O I：

10.1016/j.jallcom.2010.12.210

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Phase separated metallic glasses were prepared in the Gd-Hf-Co-Al system by rapid quenching of the melt. Due to the strong positive enthalpy of mixing between the main constituent elements Gd and Hf (Delta HGd-Hf = +11 kJ/mol) a heterogeneous microstructure is formed consisting of two amorphous phases, which are Gd-enriched and Hf-enriched, respectively. The size of the phase separated regions varies from 0.1 mu m to 5 mu m, depending on alloy composition and cooling rate. Different types of microstructure, such as an interconnected structure or a droplet structure were obtained as a function of cooling rate. The microstructure of the phase separated metallic glasses is determined not only by their composition, the critical temperature, and the shape of the miscibility gap, but also by the viscosity and diffusivity of the melt. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：S42 / S45

页数：4

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