A Study on Dissimilar Friction Stir Welded between the Al–Li–Cu and the Al–Zn–Mg–Cu Alloys

Abstract

In this paper, the microstructure of friction stir welded between the Al–Li–Cu alloy and the Al–Zn–Mg–Cu alloy was studied using optical microscope(OM), electronic backscattered diffraction (EBSD), SEM, and TEM. The hardness profile revealed that the range of heat affect zone for the Al–Zn–Mg–Cu alloy was slightly wider than the Al–Li–Cu alloy when they suffered from the thermal transient. Additionally, the characterization of precipitates inside the different zones was obviously different, which corresponded to the microhardness distribution profile. At the periphery of the kissing line, the Al–Li–Cu and the Al–Zn–Mg–Cu alloys mutually diffused during the weld process. The magnesium element in the Al–Zn–Mg–Cu alloy diffused into the Al–Li–Cu alloy. But the copper and zinc had no change because of the low diffusion coefficient in aluminum. The heat affected zone of the Al–Zn–Mg–Cu alloy showed a higher corrosion susceptibility immersed into the corrosion environment, and the Al–Li–Cu alloy did not show severe corrosion.

Effect of Travel Speed on Microstructure and Mechanical Properties of FSW Joints for Al–Zn–Mg Alloy

“…Martinez et al [47] reported that the dissolution and coarsening of both metastable η' precipitates and stable η precipitates are affected by both the peak temperature and the duration of time at elevated temperatures. Consequently, the dwell time and the peak temperature in HAZ have a significant impact on the dissolution or coarsening of η' precipitates [45,47,48]. As a result, the travel speeds give rise to different features of precipitation.…”

Sürtünme Karıştırma Kaynak Tekniği ile Birleştirilen Pirinç (CuZn63) Levhaların Mekanik Özelliklerinin İncelenmesi

“…Son yıllarda magnezyum, titanyum, bakır [3][4][5], düşük karbonlu çelikler, paslanmaz çelikler, pirinçler, kompozitler ve termoplastik malzemelerin [6][7][8][9][10] birleştirilmesinde kullanılmaktadır. Son zamanlarda, alüminyum-çelik, alüminyum-magnezyum, alüminyumun-bakır, alüminyumun-gümüş ve magnezyum-çelik gibi farklı metallerinkaynağında da bu kaynak tekniği kullanılmaya başlanmıştır [11][12][13].…”

Microstructure and Corrosion Behavior of Friction Stir-Welded 6061 Al/AZ31 Mg Joints with a Zr Interlayer

“…The research emphasis at present relating to Al/Mg FSW joints with interlayers is focused on the enhancement of the mechanical properties. In addition to the mechanical properties, corrosion properties are another key issue for joint safety in the service course [13,14]. In general, preferential corrosion occurs at the Mg alloy in Al/Mg FSW joints because of its lower corrosion potential, which will damage the joint strength and lead to joint failure, compared with that of the Al alloy [15,16].…”