TiAl_3相对原位TiC/Al-4.5Cu复合材料高温磨损行为的影响

Effect of TiAl_3 Phase on Dry Wear Behavior of In-situ TiC/Al-4.5Cu Composites at Elevated Temperature

采用接触反应法制备了原位TiC/Al-4.5Cu复合材料,研究了微观组织中TiAl_3相对复合材料100~250℃高温下干摩擦磨损行为的影响。结果表明:高温下原位TiC/Al-4.5Cu复合材料磨损量均随载荷(15~55 N)增加而增加,但含TiAl_3相的复合材料磨损量始终较高。当载荷大于35 N,复合材料存在一个磨损加剧的临界转变温度;含TiAl_3相的复合材料该临界转变温度较低。TiAl_3相的存在降低了复合材料的耐磨性。

In-situ TiC/Al-4.5 Cu composites were made by direct reaction synthesis（DRS） and the effect of TiAl_3 phase on the dry wear behavior of the in-situ TiC/Al-4.5 Cu composites from 100 °C to 250 °C was studied.The results show that the wear loss of in-situ TiC/Al-4.5 Cu increases with the load increasing from 15 N to 55 N at elevated temperature.The wear loss of the composites containing TiAl_3 phase is always larger.There is a critical transition temperature（CTT） of severe wear when the load exceeds 35 N and the composites with TiAl_3 phase possess lower CTT.TiAl_3 phase degrades the wear resistance of in-situ TiC/Al-4.5 Cu composites.