轧制方式对ATZS3311合金组织和高温力学性能的影响

Effect of rolling method on microstructure and high temperature mechanical properties of ATZS3311 alloy prepared by traditional gravity casting method were studied by means of optical microscope, X-ray diffractometer, universal material testing machine and scanning electron microscopy. The results show that the rolling method has a significant effect on the microstructure and mechanical properties of the alloy. Due to the banded distribution of the Mg₂Si phase, the strength of the alloy rolled by unidirectional rolling at room temperature is better than that by cross rolling, but the distribution of the Mg₂Si phase after cross rolling is more uniform, which makes a significant contribution to the improvement of high temperature strength of the alloy. High temperature tensile results show that the tensile strength of the cross rolled alloy is obviously better than that of unidirectional rolled alloy, and after stretching at 150 ℃ and 200 ℃, the tensile strength of the alloy reaches 168 MPa and 166 MPa, respectively, and the elongation at fracture reaches 28% and 31%, respectively. The above results show that the cross rolling can obviously improve the high temperature mechanical properties of the ATZS3311 alloy.