α-NiPt(Al) and phase equilibria in the Ni-Al-Pt system at 1150°C

被引：103
作者：
Hayashi, S
Ford, SI
Young, DJ
Sordelet, DJ
Besser, MF
Gleeson, B
机构：
[1] Iowa State Univ Sci & Technol, Dept Mat Sci & Engn, Ames, IA 50011 USA
[2] Univ New S Wales, Sch Mat Sci & Engn, Sydney, NSW 2052, Australia
来源：
ACTA MATERIALIA | 2005年 / 53卷 / 11期
基金：
澳大利亚研究理事会;
关键词：
synchrotron radiation; platinum-group; nickel aluminides; crystal structure; phase equilibria;
D O I：
10.1016/j.actamat.2005.03.046
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The alpha-NiPt(Al) phase and its associated equilibria in the Ni-Al-Pt system at 1150 degrees C were investigated by analyzing equilibrated bulk alloys and the interdiffusion zones of diffusion couples. Phase constitutions, tie-lines and microstructures were determined using a combination of techniques, including high-energy synchrotron X-ray diffraction, scanning electron microscopy and electron probe microanalysis. A large Pt solubility limit was found to exist in the beta-NiAl, similar to 42 at.%, and in gamma'-Ni3Al, similar to 32 at.%. The alpha-NiPt(Al) phase was found to have wide Pt solubility range of about 33-60 at.% and to skew along an almost constant Pt/Al ratio of 1.5. The alpha-NiPt(Al) has an ordered face-centered tetragonal L1(0) crystal structure, with the Al and Pt atoms found to be preferentially located in the corners and prismatic faces, respectively. The temperature dependence of the lattice parameters and unit cell volume of the a phase were also determined. (c) 2005 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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页码：3319 / 3328
页数：10
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