振动对消失模铸造Al-18Si/AZ91D双合金界面组织和力学性能的影响  

Effect of vibration on the interface micro-structure and mechanical properties of lost foam casting Al-18Si/AZ91D double-alloy

作　　者：王俊龙 蒋文明[1] 管峰 李广宇[1] 张政[1] 樊自田[1] WANG Junlong;JIANG Wenming;GUAN Feng;LI Guangyu;ZHANG Zheng;FAN Zitian(State Key Laboratory of Material Forming and Die Technology,Huazhong University of Science and Technology,Wuhan 430074,Hubei China)

机构地区：[1]华中科技大学材料成形与模具技术国家重点实验室,湖北武汉430074

出　　处：《中国铸造装备与技术》2022年第4期5-16,共12页China Foundry Machinery & Technology

基　　金：国家自然科学基金资助(52075198);国家重点研发计划项目资助(2020YFB2008304);国家磁约束核聚变能发展研究专项资助(2018YFE0313300);新金属材料国家重点实验室开放课题重点基金资助(2021-ZD07)。

摘　　要：研究了机械振动对消失模铸造Al-18Si/AZ91D双合金界面组织和力学性能的影响。结果表明,施加振动之后,Al-18Si/AZ91D双合金结合界面的金属间化合物(IMCs)层厚度由715.7μm减小到575.4μm,从而消减了界面存在的脆性相;振动还消除了Al_(3)Mg_(2)层存在的粗大初晶Si,将其转化为细小而分散的Mg_(2)Si;此外,由于高Si含量的影响,施加振动对Al-18Si/AZ91D表现出明显的破除氧化膜的作用,这有利于减少界面缺陷,促进元素扩散。剪切结果显示,施加振动之后,Al-18Si/AZ91D双合金的平均剪切强度从49.7MPa提升到65.2MPa。The effect of mechanical vibration on the interface micro-structure and mechanical properties of lost foam casting Al-18Si/AZ91D double-alloy has been studied.The results show that the thickness of the inter-metallic compounds(IMCs)layer at the Al-18Si/AZ91D double-alloy bonding interface decreases from 715.7μm to 575.4μm after applying vibration,thereby eliminating the brittle phase existing at the interface;the vibration also eliminates the existence of the Al_(3)Mg_(2) layer.The coarse primary Si is converted into fine and dispersed Mg_(2)Si;in addition,due to the influence of high Si content,the application of vibration on Al-18Si/AZ91D shows an obvious effect of breaking the oxide film,which is beneficial to reduce the interface defects and facilitate element diffusion.The shear results show that the average shear strength of the Al-18Si/AZ91D double-alloy increases from 49.7MPa to 65.2MPa after applying vibration.

关 键 词：机械振动 消失模铸造 Al/Mg双合金 界面组织 力学性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG249.6[金属学及工艺—金属材料]