搅拌摩擦加工Al-30Cu合金的微观组织及阻尼行为  

Microstructure and damping behavior of Al-30Cu alloy by friction stir processing

作　　者：江鸿杰[1,2] 张平 张德宇 黄宏锋 伍潇 JIANG Hong-jie;ZHANG Ping;ZHANG De-yu;HUANG Hong-feng;WU Xiao(College of Material Science and Engineering,Guilin University of Technology,Guilin 541004,China;Guangxi Key Laboratory of Processing for Non-Ferrous Metals and Featured Materials,Education Ministry,Guilin University of Technology,Guilin 541004,China)

机构地区：[1]桂林理工大学材料科学与工程学院,广西桂林541004 [2]桂林理工大学广西有色金属及特色材料加工教育部重点实验室,广西桂林541004

出　　处：《轻合金加工技术》2022年第4期55-61,共7页Light Alloy Fabrication Technology

基　　金：国家自然科学基金(52061011);广西科技基地和人才专项(GKAD19110087);桂林理工大学博士科研启动基金项目(GUTQDJJ2014016)。

摘　　要：采用搅拌摩擦加工(FSP)技术制备出具有细晶组织的Al-30Cu合金,并对其微观组织和阻尼性能进行了研究。研究结果表明:Al-30Cu合金经过FSP后,晶粒和Al_(2)Cu相均得到显著细化,Al-30Cu合金FSP过程中并没有新相生成;Al-30Cu合金的内耗值均随着应变和温度的增大而增大,且FSP样品的阻尼性能明显优于母材的;当温度为360℃时,低转速FSP样品的内耗值高达0.276,比母材的提升了268%,FSP样品中大量的细小晶界以及Al_(2)Cu相与基体间的界面发生滑移运动,诱发晶界和界面阻尼,使合金内耗值增加;Al-30Cu合金的储能模量值均随着应变和温度的增大而减小,FSP样品的存储模量低于母材的。The Al-30 Cu alloy with fine-grained structure was prepared by friction stir processing(FSP),and its microstructure and damping behavior were studied.The results show that the grain and the Al_(2)Cu phase of Al-30 Cu alloy are refined significantly after FSP,and no new phase is formed in Al-30 Cu alloy during FSP process.The internal friction of Al-30 Cu alloy increases with the increase of strain and temperature,and the damping capacity of FSP sample is obviously better than that of the base material.At 360 ℃,the internal friction value of low rotation speed FSP sample is as high as 0.276,which is 268% higher than that of the base material.In the FSP samples,slip motions occur in a large number of fine grain boundaries and the interface between the Al_(2)Cu phase and the matrix,which induces grain boundary and interface damping and increases the internal friction of the alloy.The storage modulus of Al-30 Cu alloy decreases with the increase of strain and temperature but the storage modulus of FSP sample is lower than that of the base material.

关 键 词：搅拌摩擦加工 Al-30Cu合金 微观组织 阻尼行为 

分 类 号：TG444[金属学及工艺—焊接]