Vitreloy-105 Behavior Under Mutual Wear

Abstract Zr-based bulk metallic glasses (BMGs) are widely used as mechanical components due to their excellent properties and high glass-forming ability. However, there is a lack of research concerning the tribological behavior of BMG versus BMG. The sliding characteristics of Vitreloy-105 (Zr52.2Cu17.9Ni14.6Al10Ti5 at.%) were studied in air using a pin-on-disk apparatus equipped for continuous measurement of friction force and without lubrication. The counterface material was the same BMG. The structure, thermal stability, and wear morphology were examined by X-ray diffraction, differential scanning calorimetry, non-contact profilometer, and scanning electron microscopy. For a normal load applied (10.0, 20.4 and 38.2 N) at constant 233 rpm the coefficient of friction ranged from 0.30 to 0.36 at steady state. Average wear rate was more pronounced on the pins under higher load and the predominant wear mechanism observed was adhesive, with presence of peeling-off and micro-cracks accompanied by some grooves and abrasive wear at lower loads.

摘要
锆基块体金属玻璃（Zr-based bulk metallic glasses，BMGs）凭借优异的综合性能与出色的玻璃形成能力，被广泛应用于机械结构部件的制造。然而，当前针对块体金属玻璃之间的摩擦学行为的研究仍较为匮乏。本研究针对维特洛依-105（Vitreloy-105，原子组成为Zr₅₂.₂Cu₁₇.₉Ni₁₄.₆Al₁₀Ti₅）的滑动摩擦特性展开研究，在空气环境中采用可连续监测摩擦力的无润滑销盘式摩擦磨损试验机开展试验，配对副材料为同种块体金属玻璃。采用X射线衍射、差示扫描量热法、非接触式轮廓仪以及扫描电子显微镜对试样的组织结构、热稳定性与磨损形貌进行表征。在恒定转速233转每分钟（rpm）、施加10.0、20.4及38.2 N法向载荷的条件下，稳态阶段的摩擦系数介于0.30至0.36之间。高载荷下销试样的平均磨损率更为显著，观测到的主要磨损机制为黏着磨损，伴随剥落与微裂纹产生；低载荷条件下则会出现少量磨痕与磨粒磨损。