漂珠/AZ91D复合材料微观组织与性能  

Microstructure and Properties of Fly Ash Cenosphere/AZ91D Composites

作　　者：刘恩洋[1] 于思荣[1] 赵严[1] 李凡国[1] 张善保[1] 李景达[1] 袁明[1] 

机构地区：[1]中国石油大学(华东),山东青岛266580

出　　处：《稀有金属材料与工程》2017年第11期3298-3304,共7页Rare Metal Materials and Engineering

基　　金：教育部科学技术研究重大项目(313056);中央高校基本科研业务费专项资金资助(14CX02132A;14CX02128A)

摘　　要：采用搅拌铸造法,向镁合金熔体中添加漂珠,制备了漂珠/AZ91D复合材料,研究了该复合材料微观组织的均匀性、相组成、力学性能和阻尼性能。结果表明,漂珠在基体中分布均匀,无偏聚现象。在复合材料制备过程中,漂珠与镁合金熔体发生反应并被填充,使得复合材料中有Mg_2Si和MgO相生成。与基体合金相比,复合材料的力学性能和阻尼性能均得到明显提高。复合材料的断裂是以解理断裂为主的脆性断裂,在断裂过程中漂珠壁被撕裂。复合材料的阻尼机制主要是位错阻尼和界面阻尼。Using a stir casting method, fly ash cenosphere/AZ91 D composites were fabricated by adding fly ash cenospheres into magnesium alloy melt. The microstructure uniformity, phase composition, mechanical properties and damping properties of the composites were studied. The results show that the fly ash cenospheres distribute uniformly in the matrix, without segregation phenomenon. In the preparation process of the composites, the cenospheres react with the magnesium alloy melt and are filled in by the melt. Thus, Mg_2Si and MgO phases form in the reaction. Compared with those of the matrix alloy, the mechanical properties and damping properties of the composites are obviously improved. The cleavage fracture occurs when the composites fail, indicating that the fracture is brittle fracture. The walls of the cenospheres are torn in the process of fracture. The damping mechanisms of the composites are mainly dislocation damping and interface damping.

关 键 词：漂珠 镁基复合材料 微观组织 力学性能 阻尼性能 

分 类 号：TB333[一般工业技术—材料科学与工程]