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Microstructure and Mechanical Properties of Ni3Al-Based Alloy/Tic Composites

Published online by Cambridge University Press:  22 February 2011

W. M. Yin ,
J. T. Guo ,
S. H. Wang ,
H. Li ,
M. H. Tan  and
W. H. Lai
W. M. Yin
Affiliation:
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, China.
J. T. Guo
Affiliation:
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, China.
S. H. Wang
Affiliation:
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, China.
H. Li
Affiliation:
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, China.
M. H. Tan
Affiliation:
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, China.
W. H. Lai
Affiliation:
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, China.
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Abstract

The microstructure and mechanical properties of Ni3Al-based composites reinforced with TiC particles have been investigated. The composites, which contained 2, 6, 10 vol.%TiC particulate reinforcement, were fabricated by solidification processing method. The matrix alloy selected for this study was the advanced nickel-aluminide (Ni-16Al-8Cr-1Zr-0.8Mo-0.04B at.%).The optical micrographs revealed that the carbides in the composites distributed uniformly in the martix and appeared as fairly equiaxed particles. SEM observation showed that the interface between TiC and matrix is quite smooth, sharp and free of any phase. The test results indicated that the hardness was increased with increasing volume fraction of TiC particles at ambient temperature, and the composites exhibited higher hardness after 1100°C × 8h heat treatment. The yield strength has been improved due to reinforcement by the TiC particles at ambient and elevated temperature, but their ductility was reduced obviously. From SEM fractography, it could be seen that tensile failure occurred at the matrix / particulate interface.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 364: Symposium L – High-Temperature Ordered Intermetallic Alloys–VI , 1994 , 351
Copyright
Copyright © Materials Research Society 1995

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