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Vol.37, No.11, 1333 ~ 1337, 1999
Title
Research Paper / Mechanical Behavior : A Model on the Hardening of Partially Crystallized Amorphous Al Alloys
김형섭Hyoung Seop Kim
Abstract
A mixture model (or composite model) in which a partially crystallized amorphous Al alloy is regarded as a nanocomposite of Al nanoparticles and remaining amorphous matrix is presented. The model aims at desoribing the hardening behaviour of primary heat treated amorphous Al-Ni-Y alloys, in which the strength (and hardness) changes according to the composition and microstructure from approximately 1000MPa for the as melt spun amorphous ribbon to 1500MPa after heat treatment. The nano-sized Al particles are treated as perfect materials because there are hardly any imperfections within the particles. The matrix is treated as amorphous materials, in which the solute concentration increases as the volume fraction of Al particles Increases. The calculated results for various compositions and heat treated specimens are compared with the experimental data in literature. It is shown that the hardness of the nanocomposite is independent of the solute concentration profile only if the hardness of the amorphous matrix is proportional to the solute concentration.
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