Abstract
Many intermetallic compounds, although possessed of good oxidation resistance at low and high temperature, fail catastrophically in some intermediate range by degradation to powder — the so-called pest phenomenon. The present study shows that grain boundary hardening, arising from local concentrations of oxygen or nitrogen and developed by heating the compounds in air, is an indicator of susceptibility to the pest. Among the observations made on MoSi 2, NiAl, various beryllides, and TiB 2 are the effects of stoichiometry and heat treatment. On the basis of experimental observations, a model is proposed in which such degradation results from preferential intergranular diffusion of a gaseous element, coupled with a temperature dependent hardening reaction.
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