Zr基大块非晶合金的摩擦磨损性能

Friction and Wear Characteristics of Zr-based Bulk Metallic Glasses

研究了以等电子浓度和等原子尺寸为依据设计的 6种不同成分的非晶合金以及同非晶合金成分相同的 4种晶态合金在干摩擦条件下同 GCr15钢对摩时的摩擦磨损行为 .结果表明 :6种不同成分非晶合金的摩擦系数相近 ,均在0 .5～ 0 .6范围以内 ;4种晶态合金的摩擦系数均在 0 .4～ 0 .5范围内 ,相同成分的晶态合金的摩擦系数比非晶合金的低 ,且显微硬度和耐磨性较高 ;非晶合金的磨损机制主要为塑性流变 ,晶态合金的磨损机制主要为脆性断裂以及磨粒磨损 .

Six kinds of Zr-based amorphous alloys with different compositions were designed and prepared according to the rules of constant electron concentration and constant atomic size. The friction and wear characteristics of the amorphous alloy under dry sliding against SAE52100 steel (GCr15) were investigated on an SRV friction and wear tester in a ball-on-disc contact configuration. The friction and wear behavior of four crystalline specimens with the same composition as the amorphous counterparts was also evaluated under the same testing conditions. The worn surface morphologies of the alloys were observed with a scanning electron microscope. Results indicated that all the amorphous alloys had nearly the same friction coefficient in the range of 0.5-0.6, while the crystalline counterparts registered the same friction coefficient in the range of 0.4-0.5 too. It was shown that the crystalline alloys had better wear resistance than the amorphous counterparts, which was dependent on the different wear mechanisms. In other words, the crystalline alloys were characterized by brittle fracture and abrasive wear, while the amorphous counterparts were characterized by severe plastic deformation and flowing. The chemical composition of the Zr-based amorphous alloys and crystalline alloys used in test is Zr-Al-Ni-Cu.