Liquid phase separation in undercooled Co-Cu alloys processed by electromagnetic levitation and differential thermal analysis

被引：37

作者：

Cao, CD ^{[1
]}

Letzig, T ^{[1
]}

Görler, GP ^{[1
]}

Herlach, DM ^{[1
]}

机构：

[1] DLR, Inst Space Simulat, D-51170 Cologne, Germany

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2001年 / 325卷 / 1-2期

关键词：

transition metal alloys; liquid alloys; crystal growth; thermal analysis;

D O I：

10.1016/S0925-8388(01)01276-2

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：

The phase separation in the metastable miscibility gap of undercooled Co-Cu alloys has been investigated by electromagnetic levitation (EML) and differential thermal analysis (DTA). The boundary line of the miscibility gap could be determined from DTA experiments through the exothermic process of separation. The separation morphologies of the levitated samples show drastic difference from those observed in the DTA-processed samples, which is attributed to the electromagnetic stirring effect and different cooling rates. The concentrations of the two separated phases determined from the solidified EML-processed samples agree well with the miscibility gap boundary measured by DTA. The statistical population of Go-rich spheres in the levitated specimens gives indication that the undercooling level has significant influence on coalescence of the minority phase. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：113 / 117

页数：5

共 12 条

[1] MODEL FOR SOLUTE REDISTRIBUTION DURING RAPID SOLIDIFICATION [J].