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Effect of grain shape on environmental embrittlement in Ni3Al tested at elevated temperatures

Published online by Cambridge University Press:  31 January 2011

C. T. Liu  and
B. F. Oliver
C. T. Liu
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6115
B. F. Oliver
Affiliation:
Materials Science and Engineering Department, The University of Tennessee, Knoxville, Tennessee 37996-2200
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Abstract

This paper describes the effect of grain shape on environmental embrittlement in boron-doped Ni3Al (24 at. % Al). The alloy showed severe embrittlement when tested at 600 and 760 °C in air. The embrittlement can be alleviated by control of grain shape, and the material with a columnar-grained structure produced by directional levitation zone remelting shows good tensile ductilities when tested in oxidizing environments. The columnar-grained structure with vertical grain boundaries minimizes the normal stress and consequently suppresses nucleation and propagation of cracks along the boundaries.

Type
Articles
Information
Journal of Materials Research , Volume 4 , Issue 2 , April 1989 , pp. 294 - 299
Copyright
Copyright © Materials Research Society 1989

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References

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