| Budget Amount *help |
¥14,950,000 (Direct Cost: ¥11,500,000、Indirect Cost: ¥3,450,000)
Fiscal Year 2015: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2014: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2013: ¥11,440,000 (Direct Cost: ¥8,800,000、Indirect Cost: ¥2,640,000)
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| Outline of Final Research Achievements |
Zero field muon spin relaxation experiments were carried out for Al-Mg-Si, Al-0.5%Mg and Al-0.5%Si alloys under various heat treatments, which have demonstrated that the muon trapping rates (νt) depended on the heat treatment on the sample and solute concentrations: (1) the concentration of dissolved Mg dominates the νt values at lower temperatures below 120 K; (2) the νt values around 200 K reflect a number of clusters; (3) the vacancy trapping is obvious around room temperature; (4) the natural aging effect is clearly observed with Al-0.5%Si. The isothermal time dependence of spin relaxation rates with the sample of Al-1.6%Mg2Si at 280, 290 and 300K showed that the spin relaxation rates at 280 K did not change for the first about 100 minutes after the solution heat treatment and quenching, then decreased with time in the logarithmic scale. Those at 290 and 300 K decreased with time from the beginning. Thus, muons clearly monitored kinetic behavior of vacancies.
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