Abstract
Stress formation of monocrystals and bicrystals is investigated in specific oriented grains and grain boundaries of AA2024 alloy by using Crystal Plasticity Finite Element Method (CPFEM). The simulations show that the maximum Schmid factor (SF) value and the number of equivalent initial slip system (EISS) play a principal role in controlling the magnitude of internal stress within monocrystals. For bicrystal model, Goss and Cube grains are not the best ones for relieving stress concentration caused by their orientations, but they are the best ones for relieving grain boundary (GB) stress concentration. To this end, the dependence relations are discussed between GB stress and an advanced comprehensive factor combining SF, and geometry compatibility factor for 5 independent slip systems. It is found that this proposed comprehensive factor considering the contribution from 5 to independent slip systems effectively improves its dependence on GB stress.
Highlights
From the aspect of texture effect on fatigue resistance of Al-CuMg alloy, grain boundary (GB) character and stress formation⇑ Corresponding author at: CIRTech Institute, Ho Chi Minh City University of
It can be seen that the stress distribution at Goss and Cube grains is symmetrical along rolling direction (RD) and transverse direction (TD)
Brass and S crystals fail to show any symmetry along RD or TD
Summary
From the aspect of texture effect on fatigue resistance of Al-CuMg alloy, grain boundary (GB) character and stress formation. Cheng et al [27] have demonstrated by a two-dimensional CPFEM on polycrystalline copper that texture orientation has a stronger dependence on GB sliding than stress exponent, and the stress concentration at GBs caused by GB sliding induces a redistribution of stress in the grain interior This reveals that the bridge factors between GB stress formation and grain orientation are essentially correlated to dislocation slipping. Considering the important role played by Goss and Cube grains in improving fatigue resistance of AA2024, the main focus from Sections 3.1 to 3.3 is directed towards the dependence of stress formation on Goss and Cube monocrystals, and Gossparticipated and Cube-participated GBs
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