低温反应自熔制备Mg基复合材料的组织与性能

Microstructure and Properties of Magnesium Matrix Composite Fabricated by Low Temperature Reaction Melting

采用一种新的合成方法———低温反应自熔制备了10vol%钛合金(Ti-6Al-4V)颗粒增强的镁基复合材料。利用光镜和扫描电镜(SEM)观察了复合材料的显微组织,并通过X射线衍射和拉伸试验对其相结构和室温力学性能进行了探讨。结果表明,复合材料的基体晶粒细小、增强体和合金元素分布均匀、基体镁颗粒间的氧化膜得到了有效的破碎和分散,同时,所制备复合材料的强度和延伸率明显高于粉末冶金法。

A novel method--low temperature reaction melting (LRM), was developed to fabricate samples of a 10vol.%Ti-6Al-4V particles reinforced Mg matrix composite. Microstructure, phase structure and mechanical properties of the composite were investigated respectively by optical microscope and scan electron microscope, X-ray diffraction technique and ambient tensile tests. The results show that, a small matrix grain size, and a uniform distribution of reinforcement particles and alloying elements are achieved in the composite; the MgO layer on surface of the original Mg particles are effectively broken into pieces and dispersed inside the matrix particles; additionally, the ultimate tensile strength, 0.2% yield strength and elongation to fracture of the LRM samples are markedly higher than those of a powder metallurgy sample.