高濃度Al-Mg固溶体での修正ノルトハイム則 [in Japanese] Corrected Nordheim's Rule in high concentraition Al-Mg solid solution [in Japanese]
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Al–0 to 8.1 mass (0 to 8.9 at)% Mg solid solution alloys were annealed at 623 K for 3.6 ks and then water quenched. Resistivity at 77 and 300 K (ρ<sub>77</sub> and ρ<sub>300</sub>) was measured. According to a corrected Nordheim's law, the relations between resistivity and atomic fraction of solute Mg, <i>X</i>, are obtained as follows;<br>ρ<sub>300</sub>/nΩm=27.66+550.6<i>X</i>(1−1.72<i>X</i>)<br>ρ<sub>77</sub>/nΩm=2.319+527.5<i>X</i>(1−1.72<i>X</i>)<br>The factor before the <i>X</i> (1 − 1.72 <i>X</i>) term becomes larger at elevated temperature of resistivity measurement. This fact shows that the solute Mg atom in aluminum has a positive deviation from Matthiessen's Rule, giving η=<i>Δ</i>ρ<sub>300</sub>/<i>Δ</i>ρ<sub>77</sub>= 1.044. The best fit relation between resistivity ratio <i>R</i>= ρ<sub>300</sub>/ρ<sub>77</sub> and ρ<sub>77</sub> is ρ<sub>77</sub>/nΩm=25.26/(R−1.043) +0.0019. Using most reliable relation between temperature and equilibrium solid solubility of magnesium to aluminum, the temperature-concentration-resistivity chart has been obtained. Utilisation of the chart is introduced.
- J. Japan Inst. Light Metals
J. Japan Inst. Light Metals 48(6), 294-298, 1998-06-30
The Japan Institute of Light Metals