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结合高能球磨和放电等离子烧结制备出具有粗晶组织、粗细晶双尺度组织和超细晶组织的TC4合金;采用球-盘微动磨损装置对比研究了这3种显微组织TC4合金在干摩擦条件下的微动磨损性能,分析了晶粒细化对TC4合金摩擦磨损性能的影响。结果表明:随着晶粒的逐步细化,TC4合金的摩擦系数和磨损率逐渐降低。这主要是因为晶粒细化导致TC4合金硬度逐渐提高,并引起磨损机制的转变。粗晶TC4合金的磨损机制为严重的粘着磨损、疲劳剥层磨损和氧化磨损;而双尺度和超细晶TC4合金的磨损机制以磨粒磨损为主并伴随着轻微的粘着磨损和氧化磨损。超细晶TC4合金拥有最高的硬度(HV为4560 MPa),在载荷30 N下具有最低的摩擦系数(~0.76)和磨损率(1.89×10-4mm3·N-1·m-1),说明晶粒细化有助于提高TC4合金的摩擦磨损性能。
TC4 alloy with coarse grain structure, coarse and fine grain double scale structure and ultrafine grain structure were prepared by high energy ball milling and spark plasma sintering. The microstructure and mechanical properties of TC4 alloy of TC4 alloy with dry friction Fretting wear properties of the TC4 alloy were studied. The effects of grain refinement on the tribological properties of TC4 alloy were analyzed. The results show that with the gradual grain refinement, the friction coefficient and wear rate of TC4 alloy decrease gradually. This is mainly because the grain refinement led to the gradual increase in the hardness of the TC4 alloy and caused a shift in the wear mechanism. The wear mechanism of the coarse-grained TC4 alloy is severe adhesion wear, fatigue peel wear and oxidative wear; while the wear mechanism of the dual-scale and ultra-fine grained TC4 alloy is abrasive wear with slight adhesive wear and oxidation wear. The ultrafine-grained TC4 alloy has the highest hardness (HV of 4560 MPa), lowest friction coefficient (~ 0.76) and wear rate (1.89 × 10-4 mm3 · N-1 · m-1) at a load of 30 N, indicating Grain refinement helps to improve the friction and wear properties of TC4 alloy.