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

J. H. Han; N. Mattern; D. H. Kim; J. Eckert

doi:10.1016/j.jallcom.2010.12.210

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

J. H. Han, N. Mattern, D. H. Kim, J. Eckert

Department of Materials Science and Engineering

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

17 Citations (Scopus)

Abstract

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 (ΔH_Gd-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 μm to 5 μm, 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.

Original language	English
Pages (from-to)	S42-S45
Journal	Journal of Alloys and Compounds
Volume	509
Issue number	SUPPL. 1
DOIs	https://doi.org/10.1016/j.jallcom.2010.12.210
Publication status	Published - 2011 Jul 14

Bibliographical note

Funding Information:
Financial support of the Deutsche Forschungsgemeinschaft DFG (Ma1531/10) and the Global Research Laboratory (GRL) Program of Korea Ministry of Education, Science and Technology are gratefully acknowledged.

All Science Journal Classification (ASJC) codes

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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10.1016/j.jallcom.2010.12.210

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abstract = "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 (ΔHGd-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 μm to 5 μm, 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.",

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AU - Han, J. H.

AU - Mattern, N.

AU - Kim, D. H.

AU - Eckert, J.

N1 - Funding Information: Financial support of the Deutsche Forschungsgemeinschaft DFG (Ma1531/10) and the Global Research Laboratory (GRL) Program of Korea Ministry of Education, Science and Technology are gratefully acknowledged.

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Y1 - 2011/7/14

N2 - 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 (ΔHGd-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 μm to 5 μm, 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.

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

Abstract

Bibliographical note

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