Liquid phase separation, solidification and phase transformations of Gd-Ti and Gd-Ti-Al-Cu alloys

被引：4
|
作者：
Schmitz, S. [1 ]
Lindenkreuz, H. -G. [1 ]
Loeser, W. [1 ]
Buechner, B. [1 ]
机构：
[1] IFW Dresden, D-01171 Dresden, Germany
来源：
CALPHAD-COMPUTER COUPLING OF PHASE DIAGRAMS AND THERMOCHEMISTRY | 2014年 / 44卷
关键词：
Titanium alloys; Metallic glasses; Phase diagram data; Electromagnetic levitation; Undercooled melts; METALLIC-GLASS; MICROSTRUCTURE; KINETICS;
D O I：
10.1016/j.calphad.2013.06.010
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
Phase equilibria of the quaternary Gd-Ti-Al-Cu system have been studied with particular respect to solidification and phase separation phenomena in metallic glasses. Along the section Gd55-xTixAl25Cu20 the primary solidifying phase changes from Gd2CuAl (x=0) toward alpha-Ti (x >= 10) with rising Ti-fraction x. This is accompanied by an upturn of the liquidus temperature from T-L=745 degrees C to T-L > 1100 degrees C. The miscibility gap predicted from thermodynamic calculations for Gd55-xTixAl25Cu20 melts at intermediate Ti-fractions was not verified experimentally. Unlike binary Gd-Ti melts, levitated Gd-Ti-Al-Cu droplets do not exhibit liquid phase separation features after quenching from different holding temperatures, even at high melt undercooling up to 200 it prior to solidification. (C) 2013 Elsevier Ltd. All rights reserved.
引用
收藏
页码：21 / 25
页数：5
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