真空-气氛保护离心铸造镁合金开放试验探索

Experiment on Magnesium Alloys by Centrifugal Casting under Vacuum-atmosphere Protection

设计了真空-气氛保护下的离心铸造镁合金试验,研究了不同铸型转速下Mg-7Al-2Sn-1Zn(质量分数,%)合金的物相、微观组织和力学性能,并与普通重力铸造的结果进行了对比。结果表明,不同制备工艺并没有改变其相组成,但是离心铸造下的组织明显细化,拉伸强度显著改善。当铸型转速为1 800r/m时,合金的抗拉强度、屈服强度和伸长率较佳,分别为175.8MPa、63.6MPa和4.98%,主要是细晶强化和固溶强化的结果。

Magnesium alloys were fabricated by centrifugal casting under vacuum-atmosphere protection by Ar2 The composition,microstructure and tensile properties of Mg-7 Al-2 Sn-1 Zn alloys fabricated by centrifugal casting with different rotating speeds were analyzed.The results indicate that the different processes cann’t change the phase compositions of alloys,however,the microstructure of alloy obtained by centrifugal casting can be refined obviously,and further the tensile properties are improved.With the centrifugal speed of 1 800 r/min,the satisfied mechanical properties can be obtained of 175.8 MPa in tensile strength,63.6 MPa in yield strength and 4.98%in elongation,which are attributed to the grain refinement strengthening and solid solution strengthening.