热处理对GZ60K镁合金摩擦磨损性能的影响

Effect of heat treatment on friction and wear properties of GZ60K magnesium alloy

为研究热处理对生物镁合金摩擦磨损性能的作用规律,对铸态Mg-6Gd-0.5Zn-0.4Zr(GZ60K)镁合金进行了固溶处理(T4)和固溶+时效处理(T6)。利用显微硬度计测试了合金的硬度,采用球盘式摩擦试验机测试了合金的摩擦磨损性能,利用SEM观察了合金的组织和磨损形貌,并结合EDS分析了微区化学成分。结果表明:与铸态相比,合金经过T4、T6热处理后显微硬度和摩擦系数变化均不明显,磨损率分别上升了28%和88%。不同状态下合金的主要磨损机制不同,该合金的耐磨性与硬度和摩擦系数无直接关系,主要受磨损形式的影响。

In order to investigate the influence of heat treatment on friction and wear properties of biodegradable magnesium alloy, solution treatment （T4） and subsequently solution aging treatment （T6） were carried out on an as-cast Mg-6Gd-0.5Zn-0.4Zr （GZ60K） magnesium alloy. Hardness of the alloy was studied by microhardness test. Dry sliding wear tests were performed using a ball-on-disk wear tester. Microstructure and worn surface morphology of the alloy were analyzed by scanning electron microscopy （SEM） coupled with an energy dispersive spectrometer （EDS）. The results indicate that the microhardness and friction coefficient of the alloys under T4 and T6 conditions exhibit no obvious difference as compared to those of the as-cast alloy; however, the wear rate increases by 28% and 88% , respectively. Different main wear mechanisms are found on the worn surface of the alloy under different conditions. Generally, the wear resistance is significantly affected by the wear mechanism, not by the microhardness or friction coefficient.