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| Effects of material texture on the macro-scale mechanical constitutive relations of FeCrAl alloys |
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Abstract Due to good corrosion resistance and oxidation resistance to high temperatures，Iron chromium aluminum (FeCrAl) alloys have been considered as a promising candidate for accident-tolerant fuel (ATF) cladding materials. Some important texture fibers including α (<110>//RD) and γ (<111>//ND) fiber are observed in FeCrAl alloys after rolling or annealing, which could affect the macro-scale mechanical performances and deep processing abilities. In this study, the representative volume elements (RVE) are developed for the polycrystalline materials of FeCrAl alloys with different textures, and the crystal plasticity model is used to describe the anisotropic behavior of single crystal. By applying periodic boundary conditions and using homogenization theory, the crystal plasticity finite element method is adopted with ABAQUS/Explicit to simulate the macro-scale stress/strain curves under the uniaxial loading. The effects of different textures on the macro-scale mechanical constitutive relations are analyzed. The research results indicate that the stress-strain curves along the rolling direction show small deviations for the materials with random orientations, α and γ fiber. However, γ fiber will result in intensive anisotropy. It is found that the yield strength along the normal direction of rolling plane is much larger than those along the rolling direction and transverse direction for the materials with γ fiber. This is induced by the fact that <111> directions of the grains are parallel to the normal direction of rolling plane, which makes the dislocation slip difficult to be activated. An increase of the texture fraction of γ fiber will enhance the yield strength along the normal direction of rolling plane. For the RVE models with a γ fiber texture, the cumulative shear strains of slip systems follow a normal distribution, and the Standard Deviation with loading along the normal direction is smaller than that with loading along the rolling direction. The simulation results could provide a reference for the optimization of material texture, processing conditions and mechanical performances for FeCrAl alloys.
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Received: 20 March 2020
Published: 28 December 2020
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2020, Vol. 41 
