Effect of alloying additions on β′ precipitation in NiAl-Ti base alloys

被引：12

作者：

Wilson, AW ^{[1
]}

Howe, JM ^{[1
]}

机构：

[1] Univ Virginia, Dept Mat Sci & Engn, Charlottesville, VA 22904 USA

来源：

ACTA MATERIALIA | 2001年 / 49卷 / 14期

关键词：

NiAl alloys; intermetallic; Heusler phase; Transmission Electron Microscopy (TEM); Atom Location by Channeling Enhanced Microanalysis (ALCHEMI);

D O I：

10.1016/S1359-6454(01)00183-5

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The precipitation of beta ' -Ni2AlTi is investigated in NiAl-3Ti-X (X=Cu, Hf) alloys to determine the effects of alloying additions. Hf enhanced the precipitation of beta ' and both Ti and Hf were found to partition to the beta ' phase. Atom Location by Channeling Enhanced Microanalysis (ALCHEMI) results indicate that Hf has a strong preference to reside on Al sites. Cu was found to enhance beta ' precipitation, but only when added to replace Ni in the composition. In this case, the beta ' phase was enriched in Ti but not Cu. By relating the stability of the phases with nearest neighbor pair interactions, it is shown that Hf increases the stability of beta ' phase, while Cu decreases the stability of the matrix beta phase relative to beta '. (C) 2001 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.

引用

页码：2653 / 2660

页数：8

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