搅拌速率对FSP制备ZrO_2/2024表层复合材料的影响

应用FSP(friction stir processing)制备ZrO2/2024表面复合材料,可以使得铝合金具有更好的耐磨性以及热障性能。在两种不同旋转速率参数条件下(搅拌头转速为1000 r/min和1600 r/min,横向移动速率为20 cm/min),制备的表面复合材料复合层厚度大约为200μm～700μm。对增强颗粒的分布、形貌和复合材料的显微硬度值进行的研究表明,ZrO2颗粒均匀地分布在铝合金基体内,与基体有良好的结合性;复合材料复合层的显微硬度值在1000 r/min以及1600 r/min条件下,较铝合金基体分别提高了83%和46%。

Research on ZrO_2/2024 Surface Composites Fabricated by Friction Stir Processing

Friction stir processing was applied to fabricate ZrO2/2024 surface composite with the expectation for better wear resistance and thermal barrier property.About 200 μm and 700 μm thick ZrO2/2024 surface composites were successfully fabricated at two rotation speeds(1000 r/min and 1600 r/min) with constant travel speed of 20cm/min.The microstructure,the distribution of the reinforcing particle and the microhardness of the obtained surface composites were evaluated.It is shown that the ZrO2 particles in the fabricated surface composites are well-distributed and have very good bonding with the matrix.Microhardness in surface composites fabricated at 1000 r/min and 1600 r/min increases by 83% and 46%,respectively,compared to aluminum alloy matrix.The thickness,the volume fraction of the reinforcing particle and the microhardness of the surface composite can be controlled by different rotation speed at a constant travel speed.