低サイクル疲労中の格子欠陥の挙動に及ぼす温度変化の影響

概要

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Torsional fatigue tests were carried out for commercial aluminium wires by changing temperature from 77 K to R.T. or vice versa, and resistivity was measured as a function of number of cycles at 77 K. After tile temperature Change from R. T. to 77 K, the resistivity increased with number of cycles, and saturated at advanced stage of fatigue. This phenomenon was explained from the change in lattice defect density given by σ^<12>=α/β{1-(1-P)e^<-(β/2)γ>} C=C_s[1-(1-P)/(K_2-β/2){K_2e^<-(β/2)γ>-((β/2-K_2p)/(1-P))e^<-K_2γ>}] C_s=(K_fα^2)/(K_2β), P=ρ^<1/2>_iβ/α where ρ_i is the dislocation density prior to temperature change, ρ, C and γ is the dislocation density, the concentration of point defects and the cumulative strain after temperature change, respectively, and K_f, K_2, α and β are constants. The decrease in resistivity induced during fatigue after the temperature change from 77 K to R. T. was thought to occur mainly due to dynamic annealing of point defects.
社団法人日本材料学会の論文
1984-02-15