Processing of bulk pure Ni, Ti and Al, through the application of high-pressure torsion (HPT) results in a grain refinement to the sub-micrometer level (240 nm in Ni, 200 nm in Ti, 1900 nm in Al). The hardness values at the steady state reach 308, 265 and 32 Hv in the bulk form after HPT-processing of the corresponding metals. We have shown that such hardnesses and grain sizes at the steady state are represented by physical properties and atomic bond parameters of pure metals [1]. Application of HPT to composites might be an approach to make the grain size further decrease and the hardness increase. In this paper, different fractions of Al, Ti and Ni powders were mixed and subjected to HPT to examine if the grain size can decrease to nanometer level or the hardness can increase.
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