Mechanisms for Goss-grains induced crack deflection and enhanced fatigue crack propagation resistance in fatigue stage II of an AA2524 alloy

Slip band formation in plastic deformation zone at crack tip in fatigue stage II of 2xxx aluminum alloys

“…As for the relationship between microstructural factors and FCP rates in 2524-T4 alloys, more details have been revealed in the previous reference [25]. The authors concluded that grain orientations were the most important effect on FCP rates.…”

“…And, the factor in governing small amount of crack deflection in Samples B mainly depends on grain orientation [25]. Samples B in three alloys main mainly possess Brass, Copper, S etc.…”

“…6 (g, h)), Cube grains 10 and 12 have low twist angle boundary with coupled Copper grain 11. Liu et al [25] revealed that grains possessing high twist angle component boundary with adjacent grains (seeing Fig. 5(b, c and g)) could retard effectively crack propagation and induce evident RICC effect.…”

“…This suggests that grains with different orientations may possess different deformability and form various numbers of slip bands during crack propagation. Based on our previous result [25], this paper further investigates grain orientation effect on slip band formation during fatigue crack growth.…”

“…Li and Liu [25] recently revealed the fact of texture components in affecting fatigue crack propagation of AA 2524-T4 alloy. Results showed that 'soft' Brass and Cube grains tended to be propagated by cracks, while 'hard' Goss grain was extremely difficult to be propagated.…”