TY - JOUR
T1 - Study of microstructure characteristics and corrosion behavior of 2524 aluminum alloy RFSSW joint
AU - Zhang, Da
AU - Xiong, Jiangtao
AU - Ma, Yankun
AU - Jiang, Nan
AU - Li, Jinglong
N1 - Publisher Copyright:
© 2022 Elsevier Inc.
PY - 2022/8
Y1 - 2022/8
N2 - Refill friction stir spot welding (RFSSW) of high strength aluminum alloy has a wide application prospect. However, the study between microstructure characteristics and macroscopic corrosion behavior of the joint is still insufficient. In this regard, 2524 aluminum alloy RFSSW joint was investigated in detail. It was found that the grain morphology, the micron-sized second phase particles and intergranular nano-precipitates were inhomogenous from SZ to HAZ. Therein, the micron-sized second phase particles of SZ were fine, while other areas were coarse. For the intergranular precipitates, the distribution was continuous in SZ and HAZ, but discontinuous in TMAZ, and they were equilibrium phase θ (Al2Cu). According to the electrochemical test results, the corrosion potential of RFSSW joint was lower than that of base material, and it worked as an anode in the macroscopic galvanic corrosion. Compared with SZ and TMAZ, HAZ exhibited the highest susceptibility to intergranular corrosion and exfoliation corrosion. The characteristics of grain morphology and the size of second phase particles had little influence on the intergranular corrosion and exfoliation corrosion, but the continuous degree of intergranular precipitates was the key factor.
AB - Refill friction stir spot welding (RFSSW) of high strength aluminum alloy has a wide application prospect. However, the study between microstructure characteristics and macroscopic corrosion behavior of the joint is still insufficient. In this regard, 2524 aluminum alloy RFSSW joint was investigated in detail. It was found that the grain morphology, the micron-sized second phase particles and intergranular nano-precipitates were inhomogenous from SZ to HAZ. Therein, the micron-sized second phase particles of SZ were fine, while other areas were coarse. For the intergranular precipitates, the distribution was continuous in SZ and HAZ, but discontinuous in TMAZ, and they were equilibrium phase θ (Al2Cu). According to the electrochemical test results, the corrosion potential of RFSSW joint was lower than that of base material, and it worked as an anode in the macroscopic galvanic corrosion. Compared with SZ and TMAZ, HAZ exhibited the highest susceptibility to intergranular corrosion and exfoliation corrosion. The characteristics of grain morphology and the size of second phase particles had little influence on the intergranular corrosion and exfoliation corrosion, but the continuous degree of intergranular precipitates was the key factor.
KW - Aluminum alloy
KW - Corrosion behaviors
KW - Microstructure
KW - Refill friction stir spot welding
UR - http://www.scopus.com/inward/record.url?scp=85132909273&partnerID=8YFLogxK
U2 - 10.1016/j.matchar.2022.112057
DO - 10.1016/j.matchar.2022.112057
M3 - 文章
AN - SCOPUS:85132909273
SN - 1044-5803
VL - 190
JO - Materials Characterization
JF - Materials Characterization
M1 - 112057
ER -