转速对商业纯铝基体上摩擦堆焊制备铝化镍增强铝基复合材料涂层的影响

Influence of rotational speed in friction surfacing of nickel-aluminide reinforced aluminum matrix composite on commercially pure aluminum

研究转速对在商业纯铝机体上用摩擦堆焊制备的铝化镍增强Al-Zn-Mg-Cu合金基复合材料涂层性能的影响。通过在半固态铸造过程中,向Al-Zn-Mg-Cu合金熔体中加入镍粉,原位制备铝化镍增强相。结果表明,当转速从600r/min增加到1000r/min时,涂覆效率从65%提高到76%。此外,铝化镍对涂覆效率无显著影响,当在转速为1000 r/min、横向移动速度为100 mm/min、轴向给料速度为125 mm/min的条件下制备涂层时,基体的硬度和剪切强度分别提高225%和195%,但基体的磨损率下降75%。与不含铝化镍的涂层相比,含铝化镍涂层的硬度提高32%,但铝化镍不会影响涂层的热稳定性,。

The effect of rotational speed in the friction surfacing of nickel-aluminide reinforced Al-Zn-Mg-Cu alloy matrix composite on commercially pure aluminum was investigated. The nickel-aluminide reinforcement was fabricated by in-situ methods based on adding nickel powders to Al-Zn-Mg-Cu alloy melt during the semi-solid casting process.The findings showed that an increase in the rotational speed from 600 to 1000 r/min raised the coating efficiency from 65% to 76%. Besides, there was no significant difference between coating efficiencies in the coating with and without nickel-aluminide. The outcomes showed that if the coating was applied at a rotational speed of 1000 r/min, a traverse speed of 100 mm/min, and an axial feeding rate of 125 mm/min, the hardness and shear strength of the substrate increased by up to 225% and 195%, respectively. But the wear rate of the substrate dropped by 75%. Although the hardness of the coating containing nickel-aluminide increases by up to 32% compared to the coating without nickel-aluminide, nickel-aluminide does not affect the thermal stability of the coating.