Relations between resistance ratio (.RHO.300/.RHO.77) and resistivity in magnesium alloys.
スポンサーリンク
概要
- 論文の詳細を見る
Dependence of resistivity of solid solution ρss on solute concentration and temperature of measurement was considered. In relatively dilute solid solution, ρss can be approximated by a linear function of solute concentration C. Deviation from Matthiessen's Rule (DMR) defined by change in dρ/dT with C can be replaced by temperature dependence of dρ/dC(≡Δρ), change in ρ with C. Using difference ε = ΔρT2-ΔρT1 and ratio η = ΔρT2/ΔρT1 of Δρ at two different temperatures T1 and T2 (T1<T2), following two relations between ρSST1 (resistivity of a (b, c) ternary solid solution at T1K) and resistance ratio R = ρT2/ρT1 are obtained.ρSST1=(ρPURET2-ρPURET1+Cbεb+Ccεc)/(R-1) ρSST1=[ρPURET2-ρPURET1ηb+CcΔρcT1(ηc-ηb)]/(R-ηb), where ρPURE is ρ of idealy pure solvent metal. For solid solution of high concentration, replacing C to f (X), an appropriate function of atomic fraction X, and Δρ to Δρf(X) based on the f (X), similar expressions as above two relations can be obtained. The R-ρ relations in commercial magnesium alloy AZ91 were investigated comparing with those calculated from reported ρ values. The Δρ of Al in Mg is smaller at 300K than at 77K and DMR is negative, however, Zn in Mg appears to show a positive DMR. As an empirical R-ρ relation applicable to ρ changes resulted from aging and solution treatment of AZ91 alloy, 52<ρ77/nΩ•m= [69.1/(R-0.77)]-13.8<138 is recommended.
- 一般社団法人 軽金属学会の論文
一般社団法人 軽金属学会 | 論文
- Mechanical and wear properties of SiC whisker/ADC12 aluminum alloy composites fabricated by die casting.
- Joining of aluminum and ceramics.
- タイトル無し
- Undercooling and solidification behavior of fluid clumps of second-poured melt of hypereutectic Al-Si alloy in Duplex Casting process.
- Change in apparent viscosity of stirred slurry during production of semi-solid hypereutectic Al-Si alloy by slurry-melt mixing process.