Mg-Al合金中AlN颗粒的原位合成机制研究

In situ synthesis and formation mechanism of AlN in Mg-Al alloys

摘要:

采用在合金熔体中通入氮气的方法在镁铝合金中原位生成了AlN颗粒增强相。合金微观组织的研究分析表明，AlN相不仅可通过间接氮化反应（3Mg+N2→Mg3N2，Mg3N2+2Al → 2AlN+3Mg)形成，而且可在熔体中由Al和N2直接反应形成。控制氮化反应温度在750℃，且合金熔体凝固后的快速重熔可在合金中获得分布均匀的AlN相。

Abstract:

In-situ synthesis of AlN-Mg composite materials by the gas bubbling method was investigated using nitrogen as the gaseous precursor in the temperature range of 700 to 800℃. The proofs of a direct reaction of N2 and Al to form AlN in Mg-Al alloy melt were found. Microstructure analysis confirmed the formation and uniform distribution of AlN phases in the alloy. An optimum process to form in situ AlN phase in Mg-Al based alloys are obtained.