Microstructural Characterization and Mechanical Property of Al-Li Plate Produced by Centrifugal Casting Method

Using a centrifugal casting method, along with deformation and aging, we produced high-strength, low-anisotropy Al-Li plate. The electron probe microanalysis, transmission microscope, differential scanning calorimetry, X-ray diffraction were used to clarify the evolution of strengthening phases. Experimental results showed that centrifugal-cast plate consisted intragrain δ′—(Al,Cu)3Li precipitate interdendritic θ′—Al2Cu particles. After cold-rolling reduction ratio 60% annealing at 800 K for 90 min, both primary θ′ δ′ dissolved in solid solution. Aging 438 60 h led formation two kinds precipitates (needle-like T1—Al2CuLi spherical sizes), which acted as main average values ultimate tensile strength yield anneal-aged reached 496 MPa 408 MPa, total elongation 3.9%. mechanical anisotropy less than 5%. fracture morphology indicated typical intergranular mode.