制备工艺对A356滑动磨损性能的影响

Effect of Preparation Process on the Sliding Wear Properties of A356

通过光学显微镜(OM)、扫描电子显微镜(SEM)、能谱分析仪(EDS)等分析手段,研究了在油润滑条件下经过T6热处理及Al-10Sr变质剂和Al-5Ti-1B-1RE细化剂复合变质处理的A356铝合金的滑动磨损性能。结果表明:在油润滑条件下,不同制备工艺的A356滑动磨损性能互有差异,在相同载荷和相同时间下,铸态A356铝合金的滑动磨损性能最差,其显微硬度最低,磨损量最高,T6态A356和变质态A356磨损性能均有改善,细化变质后经T6热处理的A356显微硬度最高,磨损量最低,其滑动磨损性能最优,其中,在300 N载荷和3 h磨损条件下,铸态A356呈典型的粘着磨损,而细化变质后经T6热处理的A356磨损机制为微切削的磨粒磨损。

The sliding wear properties ofA356 alloy aluminum was investigated under oil lubricated condition after heating processing by T6 and adding AI-10Sr and A1-5Ti-IB-1RE complex, using the analysis method of optical microscopy （OM）, scanning electron microscopy （SEM）, energy dispersive X-ray spectroscopy （EDS）. The results show that under oil lubricated condition, the sliding wear properties of different processing A356 alloy is different. At the same load and times, the sliding wear properties of as-cast A356 aluminum alloy was the worst, and the microhardness is lowest, wears are the highest. The wearing property ofA356 alloy processing by T6 and A356 adding Al-5Ti-IB-1RE complex were improved. But A356 alloy processing by T6 and complex has the highest microhardness, least wears and the sliding wear property is the best. At 300 N load and 3 h wearing condition, the as-cast A356 alloy showed typical adhesive wear, the A356 alloy processed by T6 and complex shows micro cutting abrasive wear.