二相合金の塑性変形におけるひずみの不均一と表面粗さ

概要

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The 6-4 brass specimen containing α-phase and β-phase was used as an example of the two-phase alloy compressed uniaxially. Inhomogeneous plastic deformation of grains appearing on the free surface of the specimen was observed by a scaning electron microscope. The change of the length of grain was measured on the photographs in the longitudinal and the transverse direction of the specimen. The effect of plastic strain on the surface roughness was also measured with the stylus instrument. It was found that the mean strain of α-phase was larger than that of β-phase, though there was a scatter of the strain in each phase. Both the mean strain in respective phase and the standard deviation of the strain increased in proportion to the applied strain. The surface roughness also increased linearly with the applied strain, Which mainly resulted from the inhomogeneous deformation of grains of a and βphases. The deformation behaviour of the two-phase 6-4 brass was discussed by comparing with that of the single-phase polycrystalline copper.
1990-09-15