アルミニウムの低温塑性疲労挙動に及ぼすびずみ振幅変化の影響

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概要

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• In order to study the behavior of lattice defects during low-cycle fatigue tests with strain-amplitude change, electrical resistivity was measured on wire (0. 55mm in dia.) of polycrystalline aluminium (99.999%) which had been torsionally fatigued at 77K. Two different total surface-strain amplitudes, 1.8 and 4.4%, were used, The dislocation density in metal during cyclic straining after changing the strain amplitude was given by ρ^<1/2>=ρ^<1/2>_s[1-[1-ρ^<1/2>_iβ/α]e]^<-(β/2)r> ρ_s=(α/β)^2 where α is a constant, β is a constant depending on strain-amplitude, γ is the cumulative plastic strain, and ρ_i is the dislocation density prior to the strain-amplitude change. In this study, the constant β was estimated from the peak torque versus cumulative plastic strain curve for fatigued metal. The concentration of point defects in metal during cyclic straining at 77K was represented as follows: C=C_s[1-(1-P)/(K_2-β/2)[K2e^<-(β/2)γ>-(β/2-K_2P)/(1-P)e^<-K2γ>]]+C_ie^<-K2γ> where K_1 and K_2 are Constants, C_s is the concentration of saturated point defects, and C_i is the concentration of point defects prior to the strain-amplitude change. The experimental data was analysed on the assumption that the increment in resistivity in fatigued metal is related to the number of dislocations and defects as (ΔR)/(ΔR_s)=mρ/(ρs)+mC/(C_s), m+n=1 where ΔR_s is the saturation value in resistivity, ΔR is the increment in resistivity, and m and n are constants.

• 社団法人日本材料学会の論文
• 1983-01-15

著者

• 正脇 謙次

  京都大学工学部

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