Journal
MATERIALS CHARACTERIZATION
Volume 168, Issue -, Pages -Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2020.110539
Keywords
Al-Cu alloy; Creep-ageing anisotropy; Stress states; Texture; Dislocation density
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Funding
- National Key Research and Development Program of China [2017YFB0306300]
- Science and Technology Plan in Hunan Province [2016RS2015]
- National Science and Technology Major Project [2017ZX04005001]
- National Natural Science Foundation of China [51601060, 51675538, 51905551]
- Free Exploration Project of State Key Laboratory of High-performance Complex Manufacturing [ZZYJKT2019-11]
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Deformation and properties are both important factors in understanding creep ageing behavior, especially for textured alloys subjected to a complex stress-state. Creep deformation and tensile properties of a textured Al-Cu alloy after tension and compression creep tests were evaluated at different orientations with respect to the rolling directions. From these observations, the in-planar anisotropy (IPA) of creep deformation and yield strength were calculated and correlated with textures and microstructures of the alloy. It has been found that the creep strain after tension and compression creep tests are largest when the applied stress is along the rolling direction (RD) and smallest when the applied stress is along the transverse direction (TD). The as-received alloy has obvious in-planar anisotropy of yield strength, but this anisotropy basically disappeared after ageing. The different stress states cause different creep mechanisms and also affect the evolution of dislocation density. It was found that the dislocation density is highest when the tensile stress is applied along the TD, while the dislocation density in different stress orientations is basically the same under compressive stress. This should be the main reason that the IPA of creep strain after compression creep test (25.4%) is greater than that after tension creep test (15.0%).
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