Abstract
Louat formulated a strengthening theory in which the four conditions specified above could be met in two phase materials in which the minor phase forms the matrix. Additionally, thermal stability is insured if the two phases are immiscible. It follows from Louat's theory that material with superior strength can be obtained by embedding a high volume fraction (greater than 50%) of ultrafine particles in a ductile matrix. In contrast to conventional materials, these particle reinforced materials are predicted to retain much of their strength even when the matrix melts. In addition, the theory predicts that the strength of such materials increases with decreasing particle size. The results presented in this paper refer to the case of iron or copper particles embedded in a lead matrix
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