On the metastable miscibility gap in liquid Cu-Cr alloys

被引：41

作者：

Zhou, Z. M. ^{[1
,2
]}

Gao, Jianrong ^{[1
]}

Li, F. ^{[1
]}

Zhang, Y. K. ^{[1
]}

Wang, Y. P. ^{[2
,3
]}

Kolbe, M. ^{[4
]}

机构：

[1] Northeastern Univ, Key Lab Electromagnet Proc Mat, Minist Educ, Shenyang 110004, Peoples R China

[2] Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China

[3] Xi An Jiao Tong Univ, Dept Mat Phys, Xian 710049, Peoples R China

[4] Deutsch Zentrum Luft & Raumfahrt DLR, Inst Mat Phys Weltraum, D-51170 Cologne, Germany

来源：

JOURNAL OF MATERIALS SCIENCE | 2009年 / 44卷 / 14期

关键词：

THERMODYNAMIC ANALYSIS; PHASE-SEPARATION; SYSTEMS; NB;

D O I：

10.1007/s10853-009-3511-y

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Electromagnetically levitated Cu-Cr alloy melts containing 5-70 at.% Cr were splat-quenched onto a chill substrate. The microstructure of the solidified alloys was investigated by scanning electron microscopy. The alloys containing 5-60 at.% Cr showed a droplet-shaped microstructure consisting of Cr-rich spheroids or and dendrites in a Cu-rich matrix, whereas those containing 65 and 70 at.% Cr showed a banded microstructure consisting of alternative Cu-rich and Cr-rich bands. Both types of microstructure presented evidence for metastable phase separation in Cu-Cr alloy compositions, thus verifying the existence of a broad miscibility gap in the undercooled liquid. However, the results suggested that the miscibility gap has a Cr-rich critical composition and a skewed geometry.

引用

页码：3793 / 3799

页数：7

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