搅拌摩擦加工5086铝合金的微观组织与阻尼行为  

Microstructure and Damping Behavior of 5086 Aluminum Alloy by Friction Stir Processing

作　　者：于博文 江鸿杰[1] 杨振兴[1,2] 刘崇宇 张平[1] Yu Bowen;Jiang Hongjie;Yang Zhenxing;Liu Chongyu;Zhang Ping(Key Laboratory of New Processing Technology for Nonferrous Metal&Materials,Ministry of Education,Guilin University of Technology;Alnan Aluminium Co.,Ltd.)

机构地区：[1]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 [2]广西南南铝加工有限公司

出　　处：《特种铸造及有色合金》2021年第5期575-579,共5页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(52061011);广西科技重大专项资助项目(桂科AA17202007)。

摘　　要：采用搅拌摩擦加工(FSP)技术对5086铝合金进行单道次加工,并对材料的微观结构、力学性能、储能模量和阻尼行为进行研究。研究表明,5086铝合金经FSP后,合金中晶粒得到细化,且第二相颗粒数量和位错密度明显降低。经FSP后5086铝合金的伸长率显著提高,其中低转速FSP试样的伸长率为22%,比母材提高了83%;在350℃时,低转速FSP试样的内耗值高达0.068,比母材内耗值高55%;当应变量高于0.06%时,合金中更多的小晶界发生滑移运动,诱发晶界阻尼,使得FSP试样的阻尼性能均明显优于母材。5086铝合金储能模量分别随着温度和应变的升高而增加,且FSP试样的储能模量均明显高于母材。Friction stir processing(FSP)technology was used for single pass processing of 5086 aluminum alloy.The microstructure,mechanical properties,storage modulus and damping behavior of the alloy were investigated.The results reveal that the grain in 5086 aluminum alloy is refined after FSP,and the number of second phase particles and dislocation density are decreased obviously.After FSP,the elongation of 5086 aluminum alloy is significantly enhanced,and the elongation of low rotation speed FSP sample reaches 22%,which is 83%higher than that of base metal.At 350℃,the internal friction value of low rotation speed FSP is 0.068,which is 55%higher than that of base material.When the strain is higher than 0.06%,small grain boundaries occur to slip and induce grain boundary damping,which takes the damping properties of FSP samples superior to that of base metal.The storage modulus of 5086 aluminum alloy is increased with the increase of temperature and strain,respectively,and the storage modulus of FSP samples is significantly higher than that of base metal.

关 键 词：搅拌摩擦加工 5086铝合金 微观组织 阻尼行为 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG453.9[金属学及工艺—金属材料]