基于空心坯料挤压AZ80镁合金轮毂组织与性能研究

Microstructure and mechanical properties of AZ80 magnesium alloy wheel hubs produced by extrusion process using hollow billet

为有效提升镁合金轮毂的综合力学性能,提出空心坯料挤压方法。采用数值模拟及试验的方法,对比研究空心坯料挤压及传统挤压AZ80镁合金轮毂的主要成形工艺,分析轮辐部位的显微组织和力学性能。结果表明:空心坯料挤压显著提高变形量,轮辐部位等效应变较传统挤压提高2倍;与传统工艺相比,空心坯料挤压AZ80镁合金轮辐的晶粒细小均匀,第二相分布也更均匀,其硬度、屈服强度、抗拉强度及伸长率均得到明显提升。该方法为提升轮毂性能提供新思路。

The extrusion process using hollow billet was put forward in order to effectively improve comprehensive mechanicalproperties ~ft magnesium alloy wheel hubs. Numerical simulation and practical experiment for producing hubs were carried out inorder to compare the microstructure and mechanical properties of the hubs produced by extrusion process using hollow billet andtraditional extrusion process. Simulation results show that the equivalent effective strain of the hub produced by extrusion processusing hollow billet is two times higher than that produced by the traditional extrusion process. Microstructure and mechanicalproperties analysis indicate that compared with the traditional method, the grain produced by the extrusion process using hollowbillet is much finer and is distributed more homogeneously, and the second phases are also distributed more evenly. Therefore,the hardness, yield strength, tensile strength and ehmgation of the hub produced hy the extrusion process using hollow billet areobviously improved. The extrusion process using hollow billet provides a new way for enhancing the mechanical performances ofthe hubs.