Microstructure and mechanical properties of AZ61 magnesium alloy parts achieved by thixo-extruding semisolid billets prepared by new SIMA
Microstructure and mechanical properties of AZ61 magnesium alloy parts achieved by thixo-extruding semisolid billets prepared by new SIMA
复制标题
新SIMA制备的触变挤压半固态坯料实现AZ61镁合金零件的显微组织和力学性能
DOI：
10.1016/s1003-6326(13)62502-9
复制
发表时间：
2013-03-01
影响因子：
4.5
通讯作者：
Luo, Shou-jing
中科院分区：
文献类型：
--
作者：
Jiang, Ju-fu;Wang, Ying;Luo, Shou-jing
采用新型应变诱导熔融激活（new SIMA）方法制备了高质量的AZ61镁合金半固态坯料。利用光学显微镜和拉伸试验研究了触变挤压部件的微观结构和力学性能。结果表明，实现完全填充状态的最佳工艺参数为施加压力784 MPa、保压时间90 s和模具温度450 ℃。与半固态等温处理相比，触变挤压件获得了较高的力学性能，如拉伸强度300.5 MPa、伸长率22%和精细的微观结构。随着等温温度和保温时间的增加，拉伸强度和伸长率先增加后减小。当压制道次由1道增加到4道时，触变挤压件的拉伸强度和伸长率大大提高，显微组织明显细化。
New strain induced melt activation (new SIMA) method was employed to prepare high-quality semisolid billet of AZ61 magnesium alloy. Optical microscopy and tensile test were used to study the microstructure and mechanical properties of the thixo-extruded component. The results showed that the optimal process parameters for achieving the complete filling status involved the applied pressure of 784 MPa, the pressure holding time of 90 s and the die temperature of 450 degrees C. Compared to semisolid isothermal treatment, high mechanical properties such as the tensile strength of 300.5 MPa and elongation of 22% and fine microstructure were obtained in the thixo-extruded parts. With increasing the isothermal temperature and holding time, the tensile strength and elongation were increased firstly and then decreased. When the press pass was increased from 1 to 4, the tensile strength and elongation of the thixo-extruded parts were greatly enhanced and microstructure was refined obviously.