In this work, the friction and wear characteristics of rolled pure tungsten were investigated by using atomic force microscope (AFM) and field emission scanning electron microscope (SEM) with electron backscatter diffraction (EBSD) characterization techniques. A ductile to brittle transition (DBT) related frictional wear behaviors have been discovered. The results indicated that the coefficient of friction maintains an almost constant value of 0.45 at low temperatures (≤ 400 °C), whereas it consistently decreases at 600 °C due to the generation of a surface oxide. The wear rate varies with temperatures and reaches a maximum at 200 °C due to the transition of the tungsten matrix from brittleness to pseudoplasticity, which leads to severe adhesive wear and large mass loss. In addition, the evolution of sub-grains underneath the friction layer and Vickers microhardness were evaluated as well. This work provides insight into understanding the relationship between temperatures, microstructure and the frictional properties of tungsten materials, and thus provides guidance for improving frictional wear behaviors in tungsten materials.

中文翻译：

---

纯钨摩擦磨损行为的温度依赖性


在这项工作中，利用原子力显微镜（AFM）和场发射扫描电子显微镜（SEM）以及电子背散射衍射（EBSD）表征技术研究了轧制纯钨的摩擦和磨损特性。已发现与韧脆转变 (DBT) 相关的摩擦磨损行为。结果表明，在低温（≤ 400 °C）下，摩擦系数几乎保持恒定值 0.45，而在 600 °C 时，由于表面氧化物的生成，摩擦系数持续下降。磨损率随温度变化，由于钨基体从脆性向假塑性转变，磨损率在200℃时达到最大值，导致严重的粘着磨损和大量的质量损失。此外，还评估了摩擦层下方亚晶粒的演变和维氏显微硬度。这项工作深入了解了钨材料的温度、微观结构和摩擦性能之间的关系，从而为改善钨材料的摩擦磨损行为提供了指导。