Phase selection in undercooled peritectic Fe-Mo alloys

被引：27

作者：

Leonhardt, M ^{[1
]}

Löser, W ^{[1
]}

Lindenkreuz, HG ^{[1
]}

机构：

[1] Inst Festkorper & Werkstofforsch Dresden, D-01171 Dresden, Germany

来源：

ACTA MATERIALIA | 2002年 / 50卷 / 04期

关键词：

iron alloys; molybdenum alloys; rapid solidification; phase transformations; microstructure;

D O I：

10.1016/S1359-6454(01)00386-X

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The change of the primary solidification mode of undercooled peritectic Fe-Mo melts has been studied by in situ observation of recalescence events during electromagnetic levitation. A maximum melt undercooling up to 380 K has been achieved. Levitated drops of controlled undercooling were quenched onto chill substrates and subjected to phase and microstructure analysis. A transition from the primary bcc-Mo to the peritectic sigma-phase solidification mode beyond a critical undercooling of 345 K was revealed for the Fe47Mo53 alloy and in a similar way for other compositions between Fe45Mo55 and Fe54Mo46. The suppression of the properitectic bcc-Mo phase was also achieved for subcritical undercooling in substrate-quenched Fe45Mo55 samples. In Fe61Mo39 a transition from the primary sigma- to the peritectic R-phase solidification mode beyond a critical undercooling of 150 K was inferred from recalescence processes and Xray investigation of as-quenched undercooled samples. (C) 2002 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.

引用

页码：725 / 734

页数：10

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