Change in resistivity and strength of 92% cold rolled Al-0 to 8%Mg solid solutions by annealing.

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  • ９２％冷間圧延したＡｌ‐０～８％Ｍｇ固溶体の焼なましによる比抵抗と強度の変化
  • 92%冷間圧延したAl-0～8%Mg固溶体の焼なましによる比抵抗と強度の変化
  • 92パーセント レイカン アツエンシタ Al-0 8パーセント Mg コヨウタ

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Abstract

Al–0 to 8.1 mass (0 to 8.9 at) %Mg solid solution alloys were annealed at 623 K for 3.6 ks (FA) after 92% final cold rolling and holding at room temperature for 60 Ms (CR–60 Ms). Resistivity was measured at 77 and 300 K(ρ77 and ρ300) before and after the annealing. Tensile test was carried out at room temperature with strain rate of 6.7 × 10−4s−1. Work hardening by the cold rolling was estimated from the difference in proof stress δσ0.2 = σ0.2CR-60Ms–σ0.2FA between the CR-60 Ms state and the FA state. For the solid solution alloys with Mg contents up to 5%Mg, the δσ0.2 due to the increase in dislocation density, NDISL, is related to the resistivity increment by the CR, δρ77=ρ77CR-6OMs− ρ77FA, as δρ0.2/MPa= 263 (δρ77/nΩm) 1/2 = 0.57 Gb (NDISL/m−2)1/2, where G is the rigidity modulus, 26 GPa, b is the magnitude of the Burgers vector, 0.29 nm, and the contribution to resistivity by the unit density of dislocation is 2.7 × 10−25Ωm3. For the alloys with Mg contents higher than 6%, the δσ0.2 is lower than expected from the above relation, perhaps because the ρ77CR, and therefore the δρ77, was increased by the contribution of G.P. zones formed during a prolonged holding at room temperature after the CR.

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