Effects of macrosegregation on mechanical and tribological properties of squeeze casting immiscible bearing alloys  

作　　者：Ming Xu Yan-guo Yin Cong-min Li Guo-tao Zhang Cong-chong Duan 

机构地区：[1]Institute of Tribology,School of Mechanical Engineering,Hefei University of Technology,Hefei 230002,China [2]School of Mechanical Engineering,Anhui University of Technology,Maanshan 243002,Anhui,China [3]Anhui Yihui New Material Co.,Ltd.,Hefei 230000,China

出　　处：《China Foundry》2023年第5期443-451,共9页中国铸造（英文版）

基　　金：This research was financially supported by the National Natural Science Foundation of China(No.51575151 and No.52005005);the Science and Technology Project of Anhui Province,China(No.1501021006).

摘　　要：The macrosegregation behaviors of Al-Sn-Cu ternary immiscible alloy castings and their effects on mechanical and tribological properties were investigated.The results demonstrate that Sn and Cu segregate in the casting simultaneously,and the mass fraction of the two elements has a"U"shaped distribution.Significantly,positive and negative segregation occur in the casting,with positive segregation appearing on the top and lower surfaces and negative segregation on the remaining surfaces,with the 1/2 surface(hot node location)having the highest degree of negative segregation.Furthermore,the results of Vickers hardness,tensile strength,and elongation show that Sn and Cu cooperatively affect the mechanical properties of castings.The higher the mass fraction of Sn and Cu elements,the higher the hardness,the greater the tensile strength,and the better the elongation.The findings of the step-by-step loading tests demonstrate that the segregation of Sn and Cu significantly impacts the tribological characteristics of the castings.The higher the mass fraction of Sn and Cu on the sample surface,the better the tribological characteristics.

关 键 词：squeeze casting Al-Sn-Cu MACROSEGREGATION mechanical properties tribological property 

分 类 号：TG146.21[一般工业技术—材料科学与工程]