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A phase mixture model was considered in which nanocrystalline materials are treated as a mixture of crystalline phase, intercrystalline phases (grain boundary, triple line junction and quadratic node) and pores. In order to investigate the effects of grain size and porosity on the elastic modulus, Budiansky's self-consistent method in conjunction with the phase mixture model was employed. The calculated...
Melt spun and heat treated Al-Ni-Y alloy ribbons have fine structures consisting of nanocrystalline Al particles or intermetallic phases embedded in an amorphous matrix. The strength (and hardness) changes according to the composition and microstructure from approximately 1000 MPa for the as melt spun amorphous ribbon to 1500 MPa after heat treatment. In order to describe this high strength and strength...
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