Abstract
1. The Orowan strengthening mechanism in dispersion-strengthened alloys remains operative up to high temperatures. For alloys processed under the same conditions a linear relationship is observed between their long-time rupture stress and the reciprocal of the mean interparticle spacing. 2. In the determination of the mean interparticle spacing it is necessary to take into account the volume fraction distribution of particles. 3. For a qualitative evaluation of the heat resistance of an alloy, use may be made of the relative volume fraction of coarse strengthening particles.
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