Cr和Mo对过共晶Al-Si合金组织与性能的影响  

Effect of Cr and Mo on Microstructure and Properties of Hyper-Eutectic Al-Si Alloy

作　　者：李润霞[1] 于洪江[1] 袁晓光[1] 黄宏军[1] 陈玉金[1] 

机构地区：[1]沈阳工业大学材料科学与工程学院,辽宁沈阳110178

出　　处：《铸造》2009年第8期839-842,共4页Foundry

基　　金：辽宁省教育厅创新团队项目(2007T132)

摘　　要：研究了合金元素Cr和Mo对过共晶Al-Si-Cu-Mg-Ni合金组织与性能的影响。试验结果表明:在过共晶Al-Si-Cu-Mg-Ni合金中添加0.6%Cr,合金抗拉强度提高了6%,而同时添加0.6%的Cr与0.4%的Mo,合金抗拉强度提高了44.2%,伸长率变化不大。SEM及能谱分析结果显示,Cr与Mo的添加都能显著地改善原合金的组织形态及相分布,Cr与Mo会形成一些富Cr和富Mo的多元相。这些相的变化及分布的改变导致了合金力学性能的提高。The research has been carried out to study the influence of chromium and molybdenum on microstructure and performance of the hyper-eutectic AI-Si alloy. The results indicate that chromium and molybdenum have important effect on UTS of the alloy. The UTS was enhanced 6% when adding 0.6% Cr to the hyper-eutectic AI-Si alloy, and 44.2% when adding 0.6% chromium and 0.4% molybdenum simultaneously. The plastic of the alloy fluctuate within a narrow range. SEM analysis demonstrates that chromium and molybdenum can improve the microstructure morphology and phase distribution of the alloy. The chromium and molybdenum can form some chromium-rich and molybdenum-rich multi-phases, which can enhance the mechanical properties of the alloy.

关 键 词：AL-SI合金 合金元素 显微组织 力学性能 

分 类 号：TG131[一般工业技术—材料科学与工程]