研究了镁对Al-Mg-Si合金熔体氧化热力学与动力学的作用,以及对Al2O3/Al-Mg-Si复合材料组织与性能的作用.热力学与动力学分析表明:镁促进了Al2O3的形核和长大,Al2O3/Al复合材料的性能改善是由于尖金石(MgAl2O4)的分解所导致的组织细化.但在合金中,镁含量太高或太低都对Al2O3的形核和长大不利.
The effect of magnesium on thermodynamics and kinetics of oxidation of melted AI-Mg-Si alloy, the microstructure and properties of Al2O3/Al-Mg-Si composites were studied in this paper. It has been found that magnesium promotes nucleating and growing of Al2O3 in Al2O3/Al composite by analysis of thermodynamics and kinetics. The properties of Al2O3/Al composite were improved by microstructure refining due to spinel (MgAl2O4) decomposing. But too high or too low content of Mg in the alloy is disadvantageous for Al2O3 nucleating and growth.
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