改性纳米SiC粉体铸造铝青铜强韧化和组织和性能研究.pdf

维普资讯 学兔兔 Apr．2008 · 330· VO1．57 No．4 改性纳米SiC粉体铸造铝青铜强韧化及 组织和性能研究 陈美玲，康 磊，杨 军，杨 莉，高 宏 (大连交通大学材料科学与工程学院，辽宁大连116028) 摘要：在生产条件下，用改性纳米SiC粉体对铸造铝青铜进行强韧化处理。呆用光学显微镜、扫描电镜和力学性能测 试等手段对处理前后的组织与性能进行了研究和讨论。结果表明：经改性纳米SiC粉体强韧化后，铝青铜的铸态组织和 断口组织得到明显的细化，组织中的B相减少，K相明显析出，其强度和伸长率分别提高了l4％和5l％；断口分析结果 表明：经强韧化处理后，铝青铜的断裂方式为韧性断裂。 关键词：改性纳米SiC粉体；铸造铝青铜；晶粒细化；韧性断裂 中图分类号：TG146．1 1文献标识码：A 文章编号：1001—4977(2008)04—0330—04 Microstructure and Mechanical Properties of Reinforced Cast Aluminum Bronze by Modified Nano—SiC Powder CHEN Mei-ling，KANG Lei，YANG Jun，YANG Li，GAO Hong (School of Material Science and Engineering，Dalian Jiaotong University，Dalian 1 1 6028， Liaoning，China) Abstract：The reinforced aluminum bronze iS prepared under actuaI production conditions by using SUrface．modified nano．SiC powder as reinforced additives．The micrOstructures and properties of the samples are investigated and discussed by means of opticaI microscope．SEM and mechanicaI testing．The results showed that the as．cast micrOstructure and fractograph of the samples are obviously refined，and the 13 phase iS reduced；the strength and toughness are increased bv 14％ and 51％ respectively，and the ductile fractures are obtained． Key words：modified nano—SiC powder；cast aIuminum bronze；grain refinement；ductile fracture 铝青铜铸件常存在晶粒粗大的缺点，Romankiewicz 1 试验材料与方法 F等人[1]以Ti、B、v、Zr、Ca、Na以及复合变质剂V+B、 Ti+B、Zr+B、Ca+B等对铸造铝青铜进行变质处理，使