粉末触变成形制备石墨烯增强ZK61镁基复合材料及性能

针对石墨烯在镁基合金中分散不均匀的问题,采用静电吸引法将Hummers法制备的氧化石墨烯与酸洗后的ZK61镁合金粉末均匀混合,通过粉末触变成形技术制备氧化石墨烯增强ZK61镁基复合材料。研究了制备工艺参数对氧化石墨烯在基体中的分散效果以及对复合材料力学性能的影响。结果表明,0.1%氧化石墨烯在840W功率下超声处理40min后,与经1%的乙酸酸洗后的镁合金粉末均匀混合,成形后氧化石墨烯在基体中分散均匀,复合材料抗拉强度比基体提高42.97%,伸长率提高6.76%,硬度变化不大。

Properties of Graphene Reinforced ZK61 Mg-based Composites Prepared by Powder Thixoforming

To solve the problem of graphene aggregation in Mg-based alloys,the method of electrostatic attraction was adopted to mix graphene oxide prepared by Hummers method with ZK61 alloy powder which was picklled,and ZK61 Mg-based composites were prepared by powder thixoforming technology.The effects of preparation parameters on the dispersion effects of graphene oxide in matrix and the mechanical properties of the composites prepared were analyzed.The results reveal that after 0.1% graphene oxide is treated by ultrasonic at 840 Wfor 40 min and then mixed with magnesium alloy powder after acid pickling at 1%concentration,graphene oxide is dispersed uniformly in the matrix after thixoforming.The ultimate tensile strength and elongation of the composites are increased by 42.97% and by 6.76%,respectively,compared with those of the matrix alloy,while the change of hardness can be ignored.