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摘要
The forming process of Ti2AlNb-based alloy was systematically studied using the gradient extrusion process with the combination method of finite element simulation and tests. The distribution of load, stress, strain and the metal flow behavior during the forming process was analyzed by DEFORM software, and the deformation type and stress state in the deformation area were analyzed and characterized by Lode coefficient and stress triaxiality. Physical mesh tests of 5A06 aluminum alloy and gradient extrusion tests of Ti2AlNb-based alloy were carried out on RZU200HF hydraulic press. The results show that during the gradient extrusion process of Ti2AlNb-based alloy, the stress state in the plastic deformation area appears to be three-way compression and one-tension-two-compression . The strain states are compression-like strain and elongation-like strain under compressive stress state. In the internal longitudinal section of the billet, the effective strain shows an upward gradient distribution from the center along the radial direction and the maximum strain gradient coefficient is about 0.94. The physical mesh variation is basically consistent with that in the numerical simulation test, the theoretical calculated and mesh test values of the effective strain of the surface layer are 4.06 and 4.27, respectively, which verifies the feasibility of the finite element simulation. And the Ti2AlNb-based alloy forming parts are successfully prepared, which provides a reference basis for further preparation of high-strength and plasticity titanium alloys. ? 2022, Editorial Board of Journal of Plasticity Engineering. All right reserved.
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