Microstructural characterization and mechanical properties of friction surfaced AA2024-Ag composites  

摩擦堆焊AA2024-Ag复合材料的显微组织表征与力学性能

作　　者：Parisa PIRHAYATI Hamed JAMSHIDI AVAL Parisa PIRHAYATI;Hamed JAMSHIDI AVAL(Department of Materials Engineering,Babol Noshirvani University of Technology,Shariati Avenue,Babol 47148-71167,Iran)

机构地区：[1]Department of Materials Engineering,Babol Noshirvani University of Technology,Shariati Avenue,Babol 47148-71167,Iran

出　　处：《Transactions of Nonferrous Metals Society of China》2020年第7期1756-1770,共15页中国有色金属学报（英文版）

基　　金：funding support of Babol Noshirvani University of Technology,Iran,through Grant Program No.BNUT/370167/99。

摘　　要：The effects of Ag on the microstructure, mechanical properties, and electrical conductivity of AA2024 aluminum alloy coating were investigated. It was fabricated by friction surfacing as an additive manufacturing process. To carry out this investigation, Ag was added by 5.3, 10.6, and 16.0 wt.% to an AA2024 consumable rod by inserting holes in it. It was found that due to the strengthening by solid solution and the formation of precipitates and intermetallic containing Ag, the driving force for grain growth is reduced and consequently the grain size of the coating is decreased. After artificial aging heat treatment, the electrical conductivities of the coatings containing 0 and 16.0 wt.% Ag are increased by 4.15%(IACS) and decreased by 2.15%(IACS), respectively. While considering a linear relationship, it can be proposed that for a 1 wt.% Ag increase, the strength and hardness of the coating will be increased by 1.8% and 1.0%, respectively. It was established that the effect of Al6(Cu,Ag)Mg4 precipitate formation on strengthening is greater than that of Ag-rich intermetallic.研究银对摩擦堆焊AA2024铝合金涂层显微组织、力学性能和电导率的影响。银添加方式为先在AA2024铝合金耗材棒横截表面钻孔,再在孔内填充银粉,其添加量为5.3、10.6和16.0%(质量分数)。结果表明,固溶强化、析出相和含银金属间化合物的形成降低晶粒生长的驱动力,从而降低涂层中的晶粒尺寸。经人工时效热处理后,含0%Ag(质量分数)涂层的电导率提高了4.15%(IACS),而含16.0%Ag(质量分数)涂层的电导率降低2.15%(IACS)。当考虑线性关系时,在银含量Ag增加1%(质量分数)的条件下,涂层的强度和硬度分别增加1.8%和1.0%。Al6(Cu,Ag)Mg4析出相的形成比富Ag金属间化合物的形成对强化的影响更大。

关 键 词：friction surfacing AA2024 aluminum alloy Ag powder AA2024-Ag composite 

分 类 号：TG455[金属学及工艺—焊接] TB33[一般工业技术—材料科学与工程]