稀土Ce变质铸造Al-12.35Si合金的组织及性能  

Microstructure and Properties of Rare Earth Ce Modified Cast Al-12.35Si Alloy

作　　者：解佩佩 史攀 李方峰 冯增建 李艳军 崔岩寿 刘志伟 XIE Peipei;SHI Pan;LI Fangfeng;FENG Zengjian;LI Yanjun;CUI Yanshou;LIU Zhiwei(State Key Laboratory for Mechanical Behavior of Materials,School of Materials Science and Engineering,Xi'an Jiaotong University,Xi’an 710049,China;Binzhou Bohai Piston Co.,Ltd.,Binzhou 256600,China)

机构地区：[1]西安交通大学金属材料强度国家重点实验室材料科学与工程学院,陕西西安710049 [2]滨州渤海活塞有限公司,山东滨州256600

出　　处：《铸造技术》2021年第6期475-481,共7页Foundry Technology

基　　金：国家自然科学基金资助项目(51974224和51604211);陕西省自然科学基金资助项目(2020JM-047);西安交通大学基本科研业务费资助项目(xtrO118008和xjj2018002)。

摘　　要：以添加Al-Ce稀土中间合金的方式对Al-12.35Si合金进行变质处理,研究Ce的添加量(0〜0.8%)对合金微观组织和力学性能的影响规律。结果表明,添加适量的Ce可以减小共晶硅的尺寸,细化第二相,减小α-Al二次枝晶臂间距,提高合金的力学性能。但是当Ce的添加量超过0.2%时,会出现过变质现象,导致合金组织粗化,降低合金的力学性能。当Ce的添加量为0.2%时,Al-12.35Si合金的变质效果最为理想且得到了最优的力学性能,与未变质的Al-12.35Si合金相比,变质后,合金的抗拉强度从168 MPa提升到223 MPa,伸长率从0.44%提高到0.72%。Al-12.35Si alloy was modified by adding Al-Ce rare earth master alloy.The effect of Ce content(0~0.8%)on microstructure and mechanical properties of as-cast Al-12.35Si alloy was studied.The results show that adding appropriate amount of Ce can reduce the size of eutectic silicon,refine the second phase,reduce the secondary dendrite arm spacing of a-Al,and improve the mechanical properties of the alloy.However,when the addition of Ce is more than 0.2%,the over-metamorphism will occur,which leads to the coarsening of the alloy microstructure and reduces the mechanical properties of the alloy.When Ce content is 0.2%,the modification effect of Al-12.35Si alloy is ideal and the best mechanical properties are obtained.Compared with the unmodified Al-12.35Si alloy,the tensile strength of the modified alloy is increased from 168 MPa to 223 MPa,and the elongation is increased from 0.44%to 0.72%.

关 键 词：CE 近共晶Al-Si合金 变质处理 微观组织 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程] TG113[金属学及工艺—金属材料]