Abstract
• Impacts of Cube texture on local softening of the joint are investigated. • High shares of maximum Schmid factor in 0.4–0.5 cause softening of the joint. • A higher fraction of Cube expresses higher softening tendencies. Based on stationary shoulder friction stir welding (SSFSW) tests results on a 12-mm-thick plate of 2195-T8 Al-Li alloy, the influence of Cube on the softening tendencies in different regions of the weld is explored by calculating the average (SF avg ) of the five maximum schmid factors (SF max ) for different crystal orientations. The interface (HAZ-TMAZ) between heat affected zone (HAZ) and thermo-mechanically affected zone (TMAZ), the bottom of welding nugget zone (WNZ-B), and TMAZ have significantly higher proportions of SF max in 0.4–0.5. It indicates that quantities of grains with softening orientations in these regions are much larger and the softening tendencies are much serious. SF avg in the 12 groups of slip systems for Cube reaches 0.4082 and expresses the higher softening tendency. The fractions of Cube in HAZ-TMAZ, TMAZ and WNZ-B reach up to 4.0%, 3.3% and 13.0%, respectively. Therefore, these regions have more seriously softening tendencies. The hardness, yield strength, and ultimate tensile strength of these areas are 54%-58%, 46%-48%, and 63%-70% of the base metal (BM), respectively.
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