【作者】 吴叶伟； 王晓军； 邓坤； 吴昆； 胡小石； 郑明教；

【Author】 Wu Yewei,Wang Xiaojun,Deng Kun,Wu Kun,Hu Xiaoshi,Zheng Mingyi (School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001)

【机构】 哈尔滨工业大学材料科学与工程学院；

【摘要】 镁基复合材料的研究已取得较大的进展,由于其高的比强度和比刚度,在航天航空工业已展现出很好的应用前景。搅拌铸造法是复合材料的制备方法之一,其成本较低且适合于工业化生产。热挤压是金属基复合材料塑性成型常用的手段之一,可以改善颗粒增强金属基复合材料的微观细织,提高力学性能。本文采用搅拌铸造法制备Grp/AZ91镁基复合材料,其石墨颗粒的体积分数为10%。研究了在350℃、挤压比12下热挤压变形对Grp/AZ91镁基复合材料组织及性能的影响。试验结果表明,片状石墨颗粒在铸态Grp/AZ91镁基复合材料中分布较为均匀,增强体沿挤压方向呈带状组织特征,Grp/AZ91镁基复合材料经热挤压后其力学性能有很大提高。更多还原

【Abstract】 The research on magnesium matrix composite has acquired great development. Magnesium matrix composite owns huge application prospects in aerospace industries due to high specific strength and specific stiffness.Stir casting is one of preparation methods for composite, which is suitable for the industrial production and the cost is low.Hot extrusion is one of metal matrix composite plastic forming methods,which improves microstructure of metal matrix composite reinforced with particles,thus then improves mechanical properties.This paper fabricates Grp/AZ91 magnesium matrix composite by stir casting,the volume fraction of graphite particles is 10%.Hot extrusion was carried out at 350℃and extrusion ratio of 12:1.Effects of hot extrusion deformation on microstructure and properties of Grp/AZ91 magnesium matrix composite were investigated.The experiment results show that the flake graphite particles are distributed uniformly in as-cast Grp/AZ91 magnesium matrix composite,the reinforcing particles present banded structure characteristics along the direction of hot extrusion,the mechanical properties of Grp/AZ91 magnesium matrix composite are enhanced greatly after hot extrusion.更多还原