Abstract
Initial and strain-aging yield points have been observed and studied for three hexagonal-based particulate composites: Cd-30 vol pct B, Mg-25 vol pct B, and Zn-15 vol pct A12O3. The strain-aging yield points begin to appear at 0.5 to 0.6Tm and persist up to the melting temperature. These effects are associated with the large volume fraction of hard particles, which are considered to be a primary source of dislocations and vacancies; strain aging yield points are attributed to the resulting decrease in mobile dislocation density, by annihilation or interaction with imperfections other than impurity atoms, which occurs during aging after straining.
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