〈100〉軸方向アルミニウム単結晶の塑性変形と遠間隔交さすべり

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It has been established that an aluminum single crystal having <100> tensile orientation shows initial rapid hardening. After about two to three percent elongation, the tensile stress-strain curve becomes flat until the necking point. It has been reported that the prominent cross slip which does not usually occur in aluminum but does, for example, in α-brass, was observed in this flat region of the curve. However, many problems pertaining to the relation between the deformation mode and the stress-strain curve of the <100> oriented single crystal have remained unsolved. In the present paper, the <100> oriented aluminum single crystals were tested in tension at room temperature and the deformation mode was examined by observation of slip lines and the changes of orientation of tensile axis. Initially, the flow stress of the <100> oriented single crystals increased rapidly due to multiple slips. After about 2% elongation, clustered slips accompanied by the prominent cross slips were formed and the deformation proceeded by the propagation of these clustered slips, likely as the Luders band deformation. Therefore, the flow stress of the single crystals became constant. After about 20% elongation, the tensile orientation of the single crystals deviated from <100> axis, due to the deformation by the clustered slips, and suitable slip systems for the deviated tensile orientation which were not accompanied by the prominent cross slips were activated. The occurrence of the prominent cross slips in aluminum crystals primarily depends on the ratio of shear stress on the cross slip system to that of the primary slip system, and in a crystal having a large value of this ratio, i. e., a tensile orientation near <100> axis, the prominent cross slip occurs.
1976-08-15

〈100〉軸方向アルミニウム単結晶の塑性変形と遠間隔交さすべり

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