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The Effect of Boron on the Microstructure of Ni2 AITi.

Published online by Cambridge University Press:  26 February 2011

S. R. Schuon  and
V. Rehzets
S. R. Schuon
Affiliation:
Metallurgy Dept. General Motors Research Laboratories, Warren, MI 48090-9055
V. Rehzets
Affiliation:
Metallurgy Dept. General Motors Research Laboratories, Warren, MI 48090-9055
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Abstract

Ingots with a nominal composition of Ni–34a/o Al–15a/o Ti + O.Ow/o B, 0.05w/o B, 0.1w/o B or 0.3w/o B were prepared and compression tested at a strain rate of 1.7 x 10–7/s at room temperature, 650°C, 870°C, and 1000°C in air. Alloys were single-phase Ni2 AITi and borides were contained in all compositions containing boron. The compressive yield strength and the ultimate compressive strength of NA2AITi containing boron is strongly affected by the type and distribution of borides. The formation of TiB2 at 0.3w/o B increased the strength at room teperature, 650°C, 870°C, ang 1000°C, while formation of a TiB-Ni2 AITi eutectic at 0.05w/o and 0.lw/o B decreased strength at all temperatures. Crack deflection by TiB2 is an important strengthening mechanism at room temperature and 650°C. However, at 1000°C, dispersion strengthening may be an important strengthening factor.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 133: Symposium H – High-Temperature Ordered Intermetallic Alloys III , 1988 , 647
Copyright
Copyright © Materials Research Society 1989

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References

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