准晶增强Al-11 Mg复合材料的组织和性能.pdfVIP

维普资讯 学兔兔 铸 造 Feb．2008 · 140· FOUNDRY VOI．57 NO．2 准晶增强AI一1 1％Mg复合材料的组织和性能 王兵辉，杨根仓，朱 满，程素玲 (西北工业大学凝固技术国家重点实验室，陕西西安710072) 摘要：以Al—l1％Mg合金为基体，十面体准晶相AI72Ni 2Co 为增强颗粒，通过机械搅拌的方法制备了Al72Ni 2Co，6／AI一11％Mg 复合材料。采用扫描电镜和能谱分析研究了Al 2Ni 2Co，6／AI．11％Mg复合材料的微观组织和成分，并测试了其拉伸性能和 硬度。试验结果表明：AI72Ni 2Co。 颗粒在加入到AI一11％Mg基体中后发生破碎和钝化，颗粒沿晶界处均匀分布。由于原 子间的相互扩散，颗粒由AI Ni 2Co 6转变为Al o2(Ni)，同时在凝固过程中伴随有Al3Ni相析出。加入15％A1 Ni 2Co 颗粒 后，Al一11％Mg合金的抗拉强度o-b、弹性模量E和维氏硬度HV分别提高了38．5％、27．1％和58．7％，但伸长率降低。 关键词：准晶颗粒；A1—11％Mg合金；复合材料；微观组织和成分；力学性能 中图分类号：TG146．2 1；TB331文献标识码：A 文章编号：1001—4977(2008)02—0140—04 Microstructure and Mechanical Properties of AI-1 1％Mg-Matrix Composites Reinforced by AIr2Ni12Co16 Decagonal ‘ Quasicrystal Particles ． WANG Bing—hui，YANG Gen—cang，ZHU Man，CHENG Su—ling (State Key Laboratory of Solidification Processing，Northwestern Polytechnical University Xi’an 71 0072，Shanxi，China) Abstract：The composites were fabricated by mechanicaI stirring method，which take AI．1 1％Mq as matrix AI72Ni12Co16 decagonaI quasicrystal as reinforced particles．The microstructure and chemicaI composition of Ab2Ni12Co dAI一1 1％Mg composites were investigated by means of SEM and energy dispersive spectrum (EDS)analysis，and the mechanicaI properties and hardness were also measured．The results showed that AI72Ni12Co16 particles were fractured and passivated after added into the AI一1 1