Ti_(P)/AM60复合材料的组织与力学性能

Microstructure and Mechanical Properties of Ti_(P)/AM60 Composites

采用超声振动辅助半固态搅拌法在不同搅拌速度下制备了钛颗粒增强AM60镁基复合材料。显微组织结果表明,加入Ti颗粒后,晶粒尺寸增大,Ti颗粒界面处析出Al8Mn5相,Ti颗粒与Mg基体的界面结构为结合良好的共格界面。拉伸试验结果表明,Ti_(P)/AM60复合材料的抗拉强度高于AM60镁合金基体。随着搅拌速度从300 r/min增加到900 r/min,抗拉强度和伸长率均先增大后减小。当搅拌速度为600 r/min时,Ti_(P)/AM60复合材料的抗拉强度和伸长率分别达到最大值183 MPa和14.3%。与AM60基体合金相比,复合材料的抗拉强度提高了15%,延伸率提高了51%。

AM60 magnesium alloys reinforced with titanium particles(Ti_(P)) were prepared by semi-solid stirring assisted ultrasonic vibration at different stirring speeds. The microstructure results show that the grain size increases after adding Ti particles. The Al8Mn5phase is precipitated at the interface of Ti particles, and the interface structure between Ti particles and Mg matrix is a coherent interface. The tensile test results show that the strength of Ti_(P)/AM60 composites is higher than that of the AM60 matrix. With increasing the stirring speed from 300 r/min to 900 r/min, the UTS and elongation both increase first and then decrease. The UTS and elongation of Ti_(P)/AM60 composites reach the maximum of 183 MPa and 14.3%, respectively, when the stirring speed is 600 r/min. The UTS is increased by 15% and elongation is increased by 51% compared with those of the AM60 matrix alloy.