稀土元素Nd在热挤压AZ61镁合金中的作用

为了确定稀土元素Nd对热挤压AZ61镁合金显微组织和力学性能的影响，利用光学显微镜对不同含Nd量的AZ61+Nd镁合金进行了显微组织观察，并通过进行位移控制的拉伸试验测定了合金的室温和高温拉伸性能.结果表明，当热挤压AZ61+Nd镁合金中的Nd含量为0.5%时，其晶粒最细，力学性能最佳；随着Nd含量的增加，热挤压AZ61+Nd镁合金的强度有所降低，而伸长率则呈现先升高后降低的变化趋势；随着实验温度的升高，热挤压AZ61+Nd镁合金的抗拉强度和屈服强度均呈降低趋势，而伸长率则呈增加趋势.

Effect of neodymium in hot-extruded AZ61 magnesium alloy

In order to clarify the influence of rare earth element Nd on microstructures and mechanical properties of hot-extruded AZ61 alloy,the microstructural observations were carried out using optical microscope,and the tensile properties at room and high temperatures were determined through performing displacement-controlled tensile tests for the AZ61-Nd alloys with the addition of 0.5%,1.0% and 1.5% Nd.The results show that when the content of Nd in the hot-extruded AZ61 alloy is 0.5%,the grains are the finest and the best tensile properties can be attained.With an increase in the content of Nd,the tensile strengths of the hot-extruded AZ61-Nd alloy decreases while the elongation to failure exhibits the initial increase followed by the reduction.When the test temperature gets increased,the tensile strengths of the hot-extruded AZ61-Nd alloy decrease,and the elongation to failure increases.