2050铝锂合金板材拉伸力学 性能三维各向异性

With the increasing application of Al-Li alloy in the aerospace field, the study of its anisotropy is conducive to the further development and utilization of Al-Li alloy. Scanning electron microscope, transmission electron microscope, X-ray diffractometer and electron back-scattered diffraction were used to observe the microstructure of 2050 Al-Li alloy with T3 status. The three-dimensional anisotropy of tensile mechanical properties of alloy plates was studied by tensile test. The results show that the strength of the rolling middle layer of 2050 Al-Li alloy plate with T3 status is the highest, the yield strength is 370 MPa, The tensile strength is 465 MPa, the elongation is the lowest at 9.6%. The transverse surface strength of alloy plate is the lowest, the yield strength is 325 MPa, the tensile strength is 431 MPa, and the elongation is the highest at 19.2%. The fracture morphology and grain size in different thickness of alloy plate are different. The grains in the surface region are thin and compact with small size, while the grains in the middle region are wide and flat with large size. The anisotropy of different thickness of 2050 Al-Li alloy plate is different: the anisotropy of yield strength and tensile strength in surface and middle region is strong, and the anisotropy of elongation is low, while the anisotropy of yield strength and tensile strength in central region is low, the anisotropy of elongation is strong. The anisotropy of different thickness of 2050 Al-Li alloy rolled plate is mainly formed by the grain orientation and texture. The strongest texture type of surface area and central area is {011}〈211〉 brass texture.