Open AccessFatigue crack growth at the representative zones in friction stir welding of a heat-treatable aluminum alloy at 200oC
Author(s) -
Tran Hung Tra
Publication year - 2018
Publication title -
vietnam journal of science and technology/science and technology
Language(s) - English
Resource type - Journals
eISSN - 2815-5874
pISSN - 2525-2518
DOI - 10.15625/2525-2518/56/1/10091
Subject(s) - welding , heat affected zone , metallurgy , friction stir welding , base metal , materials science , alloy , microstructure , aluminium , grain size , paris' law , composite material , fracture mechanics , crack closure
Aluminum alloy 6063-T5 plates were joined by friction stir welding technique. The fatigue crack growth (FCG) in the thermo-mechanical affected zone (TMAZ) and in the heat affected zone (HAZ) of the welding was examined at 200oC. Although the grain microstructure of the TMAZ was significantly refined in comparison with that of BM, the FCG rate in TMAZ and base metal was shifted a comparable amount when the test temperature was elevated from room temperature to 200oC. In the metallurgical view, the FCG rate in the fine grain TMAZ was higher than that in coarse grain HAZ and base metal site.