Metastable phase formation in undercooled near-eutectic Nb-Al alloys

被引：40
|
作者：
Loser, W [1 ]
Hermann, R [1 ]
Leonhardt, M [1 ]
Stephan, D [1 ]
Bormann, R [1 ]
机构：
[1] GKSS FORSCHUNGSZENTRUM GEESTHACHT GMBH,D-21502 GEESTHACHT,GERMANY
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 1997年 / 224卷 / 1-2期
关键词：
dendrites; eutectic melts; metastable phase formation;
D O I：
10.1016/S0921-5093(96)10559-1
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The non-equilibrium solidification behavior of undercooled hypoeutectic and eutectic melts (Nb-52 to 59.5 at.% Al) has been analyzed with respect to metastable phase and microstructure formation. A method combining controlled melt undercooling achieved by an electromagnetic levitation technique and rapid quenching of the undercooled drop on a chill substrate was established to study the primary solidification structure. In situ measurements of the recalescence process revealed thermal arrests characteristic for metastable phase formation and solidification rates typically for dendritic solidification. Dendrites of the metastable tetragonal sigma*-phase were identified in quenched samples, and their composition was related to the calculated metastable phase diagram. The metastable dendrites gradually decompose into an anomalous eutectic microstructure on slow post-solidification cooling. (C) 1997 Elsevier Science S.A.
引用
收藏
页码：53 / 60
页数：8
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