高静水圧力下におけるカドミウム単結晶の塑性挙動

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  • Plastic deformation behavior of cadmium single crystals under high hydrostatic pressure.
  • コウ セイスイ アツリョクカ ニ オケル カドミウム タンケッショウ ノ ソセ

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In the preceeding study on the effect of hydrostatic pressure on the flow stress of polycrystalline cadmium, it was indicated that the rate of increase of the flow stress Δσ/σ due to 600MPa was larger than that of the shear modulus ΔG/G due to the same pressure. In the present study, tensile tests were made under hydrostatic pressures of 10 and 600MPa on cadmium single crystals of four different orientations.<br>The results obtained are summarized as follows.<br>(1) The yield stress for the slip in the basal plane increased by 6.9% at 600MPa and this amount of the rate of increase was in good agreement with ΔG/G of 7.0% on the basal plane. The value of Δσ/σ for the basal slip increased monotonically with an increase of strain.<br>(2) A non-basal slip system operative in cadmium crystals was {1122} ‹1123›. The vaule of Δσ/σ for this slip was 16 to 18% and it was considerably larger than ΔG/G of 4.9% on the {1122} plane. Further, a decrease in the strain hardening rate due to high pressure occured in the high strain range near to the maximum load point.<br>(3) In the extention along ‹0110› and ‹1120›, Δσ/σ for the deformation twinning was smaller than those for the basal and the {1122} ‹1123› slip. Especially in the ‹0110› crystals the flow stress σ and Δσ/σ for the slip within the twin block were well consistent with those for the {1122} ‹1123› slip.

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  • 材料

    材料 36 (407), 847-853, 1987

    公益社団法人 日本材料学会

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