EFFECT OF Cr ADDITION ON MICROSTRVCTURES AND MECHANICAL PROPERLIES OF β-NiAl ALLOYS

Abstract

Abstract: The effect of Cr addition on the microstructures and mechanical properties of NiAl inermetallic alloys containing 4 to 8 mol% Cr has been characterized. It is shown that Cr is not only an efficient soild solution strengthener in NiAl, it is also an efficient precipitation Strengthener by fine dispersion of α-Cr particles. Transmission electron microscope observations have revealed that fine spherical particles of α-Cr appeared homogeneously in the NiAl matrix by aging at temperatures around 1073K after solution annealing at 1563K. The aging behavior was investigated by microhardness measurements and the temperature dependence of the yield stress of NiAl containing α-Cr particles was investigated by compression tests over the tempemture range from 298 to 1173K. NiAl alloys happened appreciably by the precipitation of α-Cr particles.Dislocations bypass the particles during deformation and typical Orowan loops were observed surrounding the α-Cr particles after deformation. Although the dispersion Of α-Cr particles increases the yield strength of NiAl at intermediate temperutre, the strength decreases appreciably at higher temperatures.

Key words: NiAl, age-hardening, precipitate, deformation mechanism, microstructure

W.H. Tian; S.L. Hu and M. Nemoto(1) Department of Materials Physics, University of Science and Technology Beijing, Beijing 100083, China 2) Department of Materials Forming, University of Science and Technology Beijing, Beijing 100083, China 3) Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University, Fukuoka 812, Japan)Manuscript received in revised form 12 October 1998. EFFECT OF Cr ADDITION ON MICROSTRVCTURES AND MECHANICAL PROPERLIES OF β-NiAl ALLOYS[J]. Acta Metallurgica Sinica (English Letters), 1999, 12(2): 173-180.

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