CuZrAlNb非晶复合材料的摩擦磨损性能

Wear behaviors of CuZrAlNb bulk metallic glass composites

为探讨元素Nb对CuZrAl体系磨损性能的影响,制备了CuZrAlNb非晶复合材料。通过扫描电镜、X射线衍射仪和摩擦磨损试验机分别对Cu44.6Zr48Al4Nb3.4和Cu45Zr48Al4Nb3合金的显微组织、相组成及摩擦磨损性能进行研究。结果表明:Nb元素微量添加能够改变合金的显微结构及磨损性能。Cu45Zr48Al4Nb3为非晶复合材料,摩擦系数相对较大、耐磨系数最大,磨损机制为黏着磨损并伴随磨粒磨损,耐磨性能好;Cu44.6Zr48Al4Nb3.4为非晶合金,其摩擦系数、耐磨系数小于Cu45Zr48Al4Nb3非晶复合材料,磨损机制为黏着磨损。该研究为实际生产CuZrAlNb非晶复合材料提供了基础数据。

This paper is concerned specifically with the preparation of CuZrA1Nb BMGCs as part of the effort to explore the effect of element Nb on their friction and wear properties. The preparation is vali- dated by analyzing the mierostructures, wear morphologies, friction coefficient and wear-resistant coeffi- cient of Cu44. 6Zr48 A14 Nb3.4 and Cu45 Zr48 A14 Nb3 alloys by scanning electron icroscope （SEM） , X-ray dif- fraction（ XRD）, friction wear testing machine. The experimental results show that minor addition of Nb provides change in the mierostructure and wear property of CuZrA1Nb alloy. CuasZr4sA14Nb3 alloy behaves as an amorphous composite material, with a relatively large friction coefficient and the largest wear resist- ance coefficient. The Cu45Zra8AlaNb3 alloy has a wear mechanism governed by adhesive wear and accom- panied by abrasive wear, and thus boasts a better wear-resisting performance. But Cu44. 6Zr48A14 Nb3.4 al- loy behaves an amorphous alloy, with a friction coefficient and wear resistant coefficient lower than those of an amorphous composite material, and thus has its wear mechanism governed by adhesive wear. The study may provide the basic data for the practical production of CuZrA1Nb BMGCs.