Hot extrusion of SiC_p/AZ91 Mg matrix composites  

SiC_p/AZ91镁基复合材料的热挤压(英文)

作　　者：王晓军[1] 胡小石[1] 聂凯波[1] 吴昆[1] 郑明毅[1] 

机构地区：[1]哈尔滨工业大学材料科学与工程学院,哈尔滨150001

出　　处：《Transactions of Nonferrous Metals Society of China》2012年第8期1912-1917,共6页中国有色金属学报（英文版）

基　　金：Projects (51101043, 50801017, 51001036) supported by the National Natural Science Foundation of China;Project (HIT.NSRIF.201130) supported by the Fundamental Research Funds for the Central Universities, China

摘　　要：SiC particles reinforced AZ91 Mg matrix composites （SiCp/AZ91） with SiC volume fractions of 5%, 10% and 15% were fabricated by stir casting. After T4 treatment, these composites were extruded at 350 °C with an extrusion ratio of 12：1. In the as-cast composite, particles segregated at a microscopic scale within the intergranular regions. Hot extrusion almost eliminated this particle aggregation and improved the particle distribution of the composites. In addition, extrusion refined the grains of matrix. The results show that hot extrusion significantly improves the mechanical properties of the composites. In the as-extruded composite, with the increase of SiCp contents, the grain size of the extruded composites decreases, the strength and elastic modulus increase but the elongation decreases.采用搅拌铸造法制备SiC体积分数为5%、10%和15%的颗粒增强AZ91镁基复合材料(SiCp/AZ91)。复合材料经过T4处理后,于350°C以固定挤压比12:1进行热挤压。在铸态复合材料中,颗粒在晶间微观区域发生偏聚。热挤压基本上消除了这种偏聚并有效地改善颗粒分布。另外,热挤压有效地细化基体的晶粒。结果表明:热挤压明显提高复合材料的力学性能。在挤压态复合材料中,随着SiC颗粒含量的升高,基体的晶粒尺寸减小,强度和弹性模量升高,但是伸长率降低。

关 键 词：EXTRUSION Mg matrix composites SICP AZ91 magnesium alloy volume fraction 

分 类 号：TG379[金属学及工艺—金属压力加工]