Characterization of microstructure and wear behavior of nickel modified Zn-27%Al alloy casting  

作　　者：Anusha Raj Kota Ramesh Gopalan Babu Rao Jinugu Surendarnath Sundaramoorthy 

机构地区：[1]Department of Metallurgical and Materials Engineering,Rajiv Gandhi University of Knowledge Technologies-R K Valley Campus,Kadapa,Andhra Pradesh,India [2]Department of Metallurgical Engineering,AU College of Engineering-Andhra University,Visakhapatnam,Andhra Pradesh,India [3]Department of Mechanical Engineering,DVR&Dr.HS MIC College of Technology(A),Vijayawada,Andhra Pradesh,India

出　　处：《China Foundry》2024年第6期693-701,共9页中国铸造（英文版）

基　　金：Science and Engineering Research Board(SERB),Government of India,New Delhi,India for funding under an R&D project to procure a high-temperature furnace.

摘　　要：Improvement of mechanical and tribological behaviors of zinc-based die cast alloy is necessary for bearing applications,and chemical modification is found to be a good choice.Chemical modification of Zn-27wt.%Al alloy was carried out with 1%,2%and 3%nickel through casting route,and its effect on microstructure,hardness,and dry sliding wear behavior was investigated.Significant refinement of dendritic microstructure is observed along with a transformation from rosette to near rounded morphology with the increase in nickel content of base alloy.With 1%nickel modification,an aluminum-rich Al_(3)Ni intermetallic compound of string type forms in inter dendritic region,while with 2%and 3%nickel modifications,a nickel-rich AlNi3 intermetallic compound of lath/plate type is formed within the intra dendritic region.Hardness of the base alloy is improved through grain boundary strengthening at a lower concentration of nickel,and particulate strengthening and spinodal decomposition are the reason for increase in hardness of the alloy with a higher content of nickel.Coefficient of friction and wear rate of base alloy is decreased with increasing nickel amount.Worn surface is characterized by delamination,smearing and grooving.The wear mechanism is transferred from adhesion to abrasive via oxide film formation with an increase in amount of nickel.

关 键 词：ZA alloy nickel modifications MICROSTRUCTURE dry sliding wear HARDNESS 

分 类 号：TG146.21[一般工业技术—材料科学与工程]