Effect of Ni content on the wear behavior of Al-Si-Cu-Mg-Ni/SiC particles composites  

作　　者：Yanyu Liu Lina Jia Wenbo Wang Zuheng Jin Hu Zhang 

机构地区：[1]School of Materials Science and Engineering,Beihang University,Beijing 100191,China [2]Ningbo Institute of Technology,Beihang University,Ningbo 315100,China [3]Qingdao Research Institute of Beihang University,Qingdao 266000,China [4]Research Institute for Frontier Science,Beihang University,Beijing 100191,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2024年第2期374-383,共10页矿物冶金与材料学报（英文版）

基　　金：the financial support from Ningbo Institute of Technology, Beihang University

摘　　要：In recent years,the addition of Ni has been widely acknowledged to be capable of enhancing the mechanical properties of Al-Si alloys.However,the effect of Ni on the wear behaviors of Al-Si alloys and Al matrix composites,particularly at elevated temperat-ures,remains an understudied area.In this study,Al-Si-Cu-Mg-Ni/20wt%SiC particles(SiCp)composites with varying Ni contents were prepared by using a semisolid stir casting method.The effect of Ni content on the dry sliding wear behavior of the prepared compos-ites was investigated through sliding tests at 25 and 350℃.Results indicated that theθ-Al_(2)Cu phase gradually diminished and eventually disappeared as the Ni content increased from 0wt%to 3wt%.This change was accompanied by the formation and increase inδ-Al_(3)CuNi andε-Al_(3)Ni phases in microstructures.The hardness and ultimate tensile strength of the as-cast composites improved,and the wear rates of the composites decreased from 5.29×10^(−4)to 1.94×10^(−4)mm^(3)/(N∙m)at 25℃and from 20.2×10^(−4)to 7×10^(−4)mm^(3)/(N∙m)at 350℃with the increase in Ni content from 0wt%to 2wt%.The enhancement in performance was due to the presence of strengthening network structures and additional Ni-containing phases in the composites.However,the wear rate of the 3Ni composite was approximately two times higher than that of the 2Ni composite due to the fracture and debonding of theε-Al_(3)Ni phase.Abrasive wear,delamination wear,and oxidation wear were the predominant wear mechanisms of the investigated composites at 25℃,whereas delamination wear and oxid-ation wear were dominant during sliding at 350℃.

关 键 词：Al matrix composite microstructure sliding test high temperature wear mechanism 

分 类 号：TB333[一般工业技术—材料科学与工程]