1 School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China 2 State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083, China 3 Light Alloy Research Institute, Central South University, Changsha 410083, China
Abstract: Aiming at the problem of coarse grains in the traditional high temperature deformation process of 2219 aluminum alloy rings, this paper proposes a new process of ring cryogenic deformation. The microstructure and mechanical properties of 2219 aluminum alloy rings were studied by means of metallographic microscope (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and tensile testing. The results show that the cryogenic deformation accumulates a large amount of storage energy in the form of high-density dislocations, which helps to recrystallize and refine grains during subsequent solution treatment and rolling process. The grain refinement makes the distribution of stress inside the alloy more uniform, and the crack propagation path is also more tortuous. The fracture mechanism is mainly along the crystal fracture. Compared with the deformation at high temperature (480 ℃), the sample undergoes cryogenic deformation under liquid nitrogen conditions and combined with heat treatment could significantly improve its comprehensive mechanical properties. Its tensile strength, yield strength and elongation are increased by an average of 20 MPa, 22 MPa and 3.0%, respectively, and its anisotropy is also significantly reduced.
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2020, Vol. 34 
