高性能Al-Si-Cu-Ni-Mg活塞合金的相分析.pdfVIP

维普资讯 学兔兔 铸 造 Feb．2008 FO RY VOI，57 NO．2 高性能AI…Si Cu Ni—Mg活塞合金的相分析 王宪芬，刘相法，丁海民 (山东大学材料液态结构及其遗传性教育部重点实验室，山东济南250061) 摘要：采用高倍视频金相显徽镜 (HRVM)和电子探针 (EPMA)微区分析技术，观察了高性能A1．Si．Cu．Ni．Mg活塞合 金的显微组织形貌，确认了合金中存在的构成相Mg Si、A13Ni、w相以及 (CuNi)2A1 3相。着重观察分析w相和MgzSi相 在热处理过程中的形态演变，发现多元共晶体中的w相固溶后由无序网格状呈现出典型的骨架状或者密堆状，而MgzSi 相固溶处理后主要以固溶强化相融入到基体中 关键词：A1．Si合金；EPMA分析；构成相 中图分类号：TG146．2 1文献标识码：A 文章编号：1001—4977(2008)02—0126—04 Phases Analysis of High Properties AI--Si--Cu--Ni—·Mg Piston Alloy WANG Xian-fen，LIU Xiang-fa，DING Hai—min (Key Laboratory of Materials Liquid Structure and Heredity，Ministry of Education，Shandong University，Ji’nan 250061，Shandong，China) Abstract：The phases of high properties AI·-Si··Cu··Ni--Mg piston alloy were analyzed by means of optical microscopy(OM)and electron probe micro—analyzer(EPMA)．The morphologies and microstructures of the A1．Si alloy were studied in detail．The result showed that and these phases consist of Mg2si，Al3Ni，AI3(CuNi)2 and W-phase besides aluminum phase，primary Si and eutectic Sf．We paid special a~ention to the W．phase and Mg2Si phase，and obsewed the evolvement of their morphologies during heat treatment．The W—phase could change frOm grid into typical framework or dense close-packed shape after quenching，while the Mg2si phase disappeared and came into being the second precipitate． Key words：Al—Si alloys；EPMA analysis；phase 活塞是发动机的心脏，在高温高压高速的情形下 1 试验方法 工作，决定着发动机的工作效率，因此要求活塞合金 具有较好的体积稳定性和较高的高温强度_】j。随着现代