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Deformation and fracture of a directionally solidified NiAl–28Cr–6Mo eutectic alloy

Published online by Cambridge University Press:  03 March 2011

X.F. Chen ,
D.R. Johnson ,
R.D. Noebe  and
B.F. Oliver
X.F. Chen*
Affiliation:
Materials Science and Engineering Department, University of Tennessee, Knoxville, Tennessee 37996-2200
D.R. Johnson
Affiliation:
Materials Science and Engineering Department, University of Tennessee, Knoxville, Tennessee 37996-2200
R.D. Noebe
Affiliation:
NASA-Lewis Research Center, Cleveland, Ohio 44135
B.F. Oliver
Affiliation:
Materials Science and Engineering Department, University of Tennessee, Knoxville, Tennessee 37996-2200
*
a)Visiting scholar from Materials Science Department, Shanghai Jiao Tong University, People's Republic of China.
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Abstract

A directionally solidified alloy based on the NiAl-(Cr, Mo) eutectic was examined by transmission and scanning electron microscopy to characterize the microstructure and room temperature deformation and fracture behavior. The microstructure consisted of a lamellar morphology with a 〈111〉 growth direction for both the NiAl and (Cr,Mo) phases. The interphase boundary between the eutectic phases was semicoherent and composed of a well-defined dislocation network. In addition, a fine array of coherent NiAl precipitates was dispersed throughout the (Cr, Mo) phase. The eutectic morphology was stable at 1300 K with only coarsening of the NiAl precipitates occurring after heat treatment for 1.8 ks (500 h). Fracture of the aligned eutectic is characterized primarily by a crack bridging/renucleation mechanism and is controlled by the strength of the semicoherent interface between the two phases. However, contributions to the toughness of the eutectic may arise from plastic deformation of the NiAl phase and the geometry associated with the fracture process.

Type
Articles
Information
Journal of Materials Research , Volume 10 , Issue 5 , May 1995 , pp. 1159 - 1170
Copyright
Copyright © Materials Research Society 1995

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References

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