Al-Mg-Si合金の時効析出過程

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タイトル別名
  • Precipitation process of Al-Mg-Si alloys by ageing
  • Al-Mg-Si ゴウキン ノ ジコウ セキシュツ カテイ

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Precipitation process of Al-Mg-Si alloys during ageing was investigated by measurements of specific heat and by electron microscopy.<br>Specific heat-temperature curves were obtained during reheating after various age-hardening treatments in four kinds of approximate pseudo-binary Al-Mg2Si system alloys; Al-0.60wt%Mg2Si-0.14wt%Mg, Al-0.99wt%Mg2Si-0.06wt%Mg, Al-1.31wt%Mg2Si-0.06wt%Mg, and Al-1.08wt%Mg2Si-0.02wt%Mg.<br>The results were discussed in comparison with those obtained by electron microscopy. Three portions for heat evolution and other three portions for heat absorption were detected on the specific heat-temperature curves of as-quenched alloys. The former portions were represented by the formation of acicular G. P. zones, rod-form β' precipitates, and tabular β precipitates. The latter portions were represented by the re-dissolution of the G. P. zones, β' and β precipitates. The effects of ageing temperature and time on the above heat evolution and absorption were examined to investigate the precipitation process of these alloys during ageing. The difference between β' and β precipitations was distinctly observed by the specific heat-temperature curves in comparison with the results obtained by electron microscopy. Clustering of the solute atoms or formation of the G. P. zones were found to occur during the process of quenching or just after quenching before specific heat measurements.

収録刊行物

  • 軽金属

    軽金属 21 (9), 565-573, 1971

    一般社団法人 軽金属学会

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