镁合金双向挤压-螺旋变形的数值模拟与实验研究

利用双向挤压与螺旋变形的特性,本研究提出镁合金双向挤压-螺旋复合变形的新方法。采用DEFORM-3D软件模拟分析螺旋角度和凹槽半径对坯料变形过程中累积应变的影响,得出合适的结构参数并加工制造出模具进行实验研究。研究结果表明:双向挤压-螺旋复合变形可极大地提高镁合金变形过程的等效应变,随着螺旋角度和凹槽半径的增大,等效应变值也相应的增大,但不均匀程度有所变大。模具螺旋角为40°和凹槽半径为0.8 mm时,试样可获得良好的等效应变值和均匀的等效应变分布,晶粒组织显著细化。

Numerical simulation and experimental research of AZ31 Mg alloys processed by dual-directional extrusion and spiral compound deformation

Using the characteristics of dual-directional extrusion and sprial deformation, a new extrusion technique of dual-directional extrusion and sprial compound deformation was proposed. Effect of sprial angle and groove radius on the accumulated strain of the deformed billet was analyzed by using DEFORM-3D software, the proper structure parameters were obtained, and the actual die was manufactured for experimental research. The research results show that the dual-directional extrusion and sprial compound deformation can greatly improve the effective strain of magnesium alloy, with the increase of sprial Angle and groove radius, the effective strain value is increased accordingly, however, the degree of strain inhomogeneity grows. Spiral angle of 40 ° and groove radius of 0.8 mm can obtain superior equivalent strain value and uniform equivalent strain distribution, and grain structure is refined dramatically.