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Fracture Mechanisms in NiAlCr Eutectic Composites

Published online by Cambridge University Press:  15 February 2011

Keh-Minn Chang
Keh-Minn Chang*
Affiliation:
GE Corporate Research and Development, P.O. Box 8, Schenectady, NY 12301
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Abstract

Selected eutectic compositions in Ni-Al-Cr ternary systems were processed by directional solidification (DS) with various growth rates. Fracture toughness tests were performed at room temperature and 400 °C; fracture surfaces of broken specimens were examined using SEM to investigate fracture behavior of each alloy. The alignment of eutectic phases was found to play an important role in composite toughening for the intermetallic matrix. Binary eutectic composites consisting of bcc α-Cr and B2 β-NiAl phases with a directional, well-aligned structure showed improved fracture properties over NiAl single crystals. Ternary eutectics, which contain an fcc γ-Ni phase, offered an excellent fracture resistance at room temperature.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 273: Symposium Q – Intermetallic Matrix Composites II , 1992 , 191
Copyright
Copyright © Materials Research Society 1992

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References

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