熔体热历史对Al-11.6%Si合金组织及性能的影响  

Effect of Melt Thermal History on Microstructures and Mechanical Property of Al-11.6%Si Alloy

作　　者：坚增运[1] 魏超锋[1] 常芳娥[1] 高玉社[1] 

机构地区：[1]西安工业大学材料与化工学院,西安710032

出　　处：《西安工业大学学报》2008年第2期137-141,共5页Journal of Xi’an Technological University

基　　金：国家自然科学基金(50571076;50671075);国家973项目(2006CB605202-3)

摘　　要：本文研究了熔体加热温度和保温时间对Al-11.6%Si合金显微组织及性能的影响.研究发现,合金液的加热温度和保温时间不仅影响合金凝固的组织,而且也影响其力学性能.将合金液温度从720℃升到900℃,共晶硅由粗大的针片状变为点状或短棒状、合金抗拉强度提高了6.33%、延伸率提高了10.83%.升温后的保温时间对合金组织和力学性能的影响时间不同于降温后的保温时间,随升温后保温时间的延长,合金的组织变细、抗拉强度和延伸率提高;随降温后保温时间的延长,合金的组织变粗、抗拉强度和延伸率降低.The effects of melt temperature and holding time on the microstructure and the mechanical property of Al-11. 6%Si alloy have been studied. It is found that the melt temperature and the holding time influence the microstructure and the mechanical property of alloy. When the melt temperature increases from 720℃ to 900 ℃, the eutectic silicon transforms from large plate to short rod or small point, and the tensile strength and extensibility increase 6.33% and 10. 83% respectively. The effect of the time holding melt in a lower temperature after a superheating process on the microstructure and the mechanical property of Al-ll. 6%Si alloy is different from that of a cooling process. For the heating process, increasing the holding time can refine the microstructure and increase the mechanical property of alloy. For the cooling process, the microstructure becomes large and the mechanical property of alloy decreases with the increasing the holding time.

关 键 词：铝合金 熔体过热 组织 抗拉强度 延伸率 

分 类 号：TG146.21[一般工业技术—材料科学与工程]