Metthiessen's Rule (M.R.) and empirical relations between resistance ratio (
R=ρ
300/ρ
77) and resistivity (ρ
77) of Al-Fe and Al-Si binary alloys containing total other impurities less than 0.1% were investigated. Relations corrected for binary solid solutions having deviation from the M.R. were proposed. To avoid systematic positive error of geometrical size factor, size fac-tor was determined by density method. Though there remains a possibility of correction in future because of effects of the other impurities, the empirical relations for the Al-Fe dilute alloys,
2.5<ρ
77/nΩ•m=24.767/(
R-1)+0.0574<3.5
and for Al-0.37-1.35%Si alloys,
5<ρ
77/nΩ•m=25.854/(
R-1)-0.1487<11
were temporarily recommended. Gradient of ρ
77 vs. (
R-1)
-1 plot for the Al-Fe alloy was smaller, and that for the Al-Si alloy was larger than ideal value, suggesting "negative" and "positive" deviation from the M.R., respectively. On the comparison of these relations, the previous relation reported for the commercially pure aluminium coincided to those of binary alloys within 1% accuracy.
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