Effects of aging heat treatment after friction surfacing on microstructure and corrosion behavior of aluminum matrix composite

作     者：Hamed JAMSHIDI AVAL 

作者机构：Department of Materials Engineering， Babol Noshirvani University of Technology， Shariati Avenue 

出 版 物：《Transactions of Nonferrous Metals Society of China》 (中国有色金属学报(英文版))

年 卷 期：2022年

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0802[工学-机械工程] 080201[工学-机械制造及其自动化] 

摘      要：This research has studied the effect of artificial aging heat treatment on the microstructure and corrosion behavior of Al-Zn-Mg-Cu alloy matrix composite. In the present study， nickel-aluminide reinforcement was fabricated in-situ during the stir casting process of Al-Zn-Mg-Cu alloy. After friction surfacing of an as-cast composite consumable rod on AA1050 substrate and post-processing artificial aging heat treatment at 125 ℃ for 18 hours， significant grain growth was observed in the nickel-free sample. Moreover， the presence of nickel-aluminide reinforcement in the microstructure of composite resulted in the formation of bimodal microstructure. The presence of nickel-rich particles and the strengthening mechanism through precipitates could help increase the hardness and strength in the nickel-containing sample. After artificial aging heat treatment， the shear strength and hardness of composite containing nickel-aluminide increased 24 and 13%， respectively， more than those in the aluminum matrix. Before aging heat treatment， the pitting corrosion resistance was significantly improved by the presence of nickel-containing particles. After aging heat treatment due to the adsorption of more significant amounts of soluble copper by nickel-rich particles in the nickel-containing sample， corrosion resistance decreased 39% compared to the nickel-free sample.