【摘 要】
：
The rapid industrial development calls for alloys that possess higher comprehensive properties.In this study,the effect of micro-alloying La addition on the precipitation behavior during artificial aging as well as the mechanical properties and electrical
【机 构】
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Shi-changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of
论文部分内容阅读
The rapid industrial development calls for alloys that possess higher comprehensive properties.In this study,the effect of micro-alloying La addition on the precipitation behavior during artificial aging as well as the mechanical properties and electrical conductivity of Al-Mg-Si alloys were investigated by thermal analysis,microstructural characterizations and properties tests.The results demonstrated that micro-alloying La addition does not change the whole precipitation sequence during the artificial aging of Al-Mg-Si alloys as well as the atomic structure of the precipitates.However,the higher La-vacancy binding energy as well as the strong La-Si and La-Mg interactions can decrease the solubility of Si and Mg in the Al matrix and the β\" precipitation activation energy from 89.9 to 76.7 kJ/mol,leading to the improvement of the strength and electrical conductivity of Al-Mg-Si alloys simultaneously.The microstructural features affecting the strength and electrical conductivity were theoretically discussed in terms of the La addition.
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