Preheating-assisted solid-state friction stir repair of Al-Mg-Si alloy plate at different rotational speeds  

作　　者：Hui Wang Yidi Li Ming Zhang Wei Gong Ruilin Lai Yunping Li 

机构地区：[1]State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China [2]Research Institute of Light Alloy,Central South University,Changsha 410083,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2024年第4期725-736,共12页矿物冶金与材料学报（英文版）

基　　金：financially supported by Science and Technology Major Project of Changsha,China(No.kh2401034);the Fundamental Research Funds for the Central Universities of Central South University(No.CX20230182);the National Key Research and Development Project of China(No.2019YFA0709002)。

摘　　要：Additive friction stir deposition(AFSD)is a novel structural repair and manufacturing technology has become a research hotspot at home and abroad in the past five years.In this work,the microstructural evolution and mechanical performance of the Al-Mg-Si alloy plate repaired by the preheating-assisted AFSD process were investigated.To evaluate the tool rotation speed and substrate preheating for repair quality,the AFSD technique was used to additively repair 5 mm depth blind holes on 6061 aluminum alloy substrates.The results showed that preheat-assisted AFSD repair significantly improved joint bonding and joint strength compared to the control non-preheat substrate condition.Moreover,increasing rotation speed was also beneficial to improve the metallurgical bonding of the interface and avoid volume defects.Under preheating conditions,the UTS and elongation were positively correlated with rotation speed.Under the process parameters of preheated substrate and tool rotation speed of 1000 r/min,defect-free specimens could be obtained accompanied by tensile fracture occurring in the substrate rather than the repaired zone.The UTS and elongation reached the maximum values of 164.2MPa and 13.4%,which are equivalent to 99.4%and 140%of the heated substrate,respectively.

关 键 词：additive friction stir deposition structural repair tool rotation speed Al alloy 

分 类 号：TG453.9[金属学及工艺—焊接]