合金元素Ta、Ag对镍基合金机械性能和摩擦学性能的影响及机理研究

利用高能球磨和真空热压烧结方法制备了添加Ta和Ag的镍基复合材料. 考察了复合材料在宽温域范围内的摩擦磨损性能和力学性能，利用SEM、XRD等表征分析其物相组成、磨损机理及断裂机制. 结果表明: 热压烧结过程中，Ta与石墨模具中的C反应生成TaC陶瓷相并在基体中弥散分布；Ta、Ag的加入降低了材料的摩擦磨损，NiCrMoAl-Ta-Ag复合材料实现了在室温~800 ℃的连续润滑，室温时Ag提供润滑作用，中温时由磨屑和Ag形成局部润滑膜，800 ℃时磨损表面形成了含氧化物、钼酸银和Ag的润滑膜. 加入Ta极大提高了材料的机械性能，NiCrMoAl-Ta合金在室温~1 000 ℃具有优异的机械性能，归因于原位生成的TaC和Al2O3陶瓷相的弥散强化；材料的断裂机制随温度升高由微孔聚集型断裂转变为以微孔聚集型和氧化断裂为主的断裂.

Nickel-based composites doped with Ta and Ag were fabricated via high-energy ball milling and vacuum hot pressing sintering. The tribological properties and mechanical properties of the composites over a wide temperature range were systematically investigated, and their phase composition, wear mechanism and fracture mechanism were characterized and analyzed via SEM, XRD and other analytical techniques. The results demonstrate that during the hot pressing sintering process, Ta reacts with carbon in the graphite mold to generate TaC ceramic phase, which is dispersedly distributed within the matrix; the addition of Ta and Ag reduces the friction and wear of the material. The NiCrMoAl-Ta-Ag composite achieves continuous lubrication across the range from room temperature to 800 ℃: Ag serves as a lubricant at room temperature, a local lubricating film is formed by wear debris and Ag at intermediate temperatures, and a lubricating film containing oxides, silver molybdate and Ag is formed on the worn surface at 800 ℃. The addition of Ta significantly improves the mechanical properties of the material. The NiCrMoAl-Ta alloy exhibits excellent mechanical properties from room temperature to 1000 ℃, which is attributed to the dispersion strengthening effect of in-situ generated TaC and Al₂O₃ ceramic phases. The fracture mechanism of the material transforms from microvoid coalescence fracture to fracture dominated by microvoid coalescence and oxidative fracture as the temperature increases.

搜集汇总

背景与挑战

背景概述

该数据集聚焦于研究合金元素钽（Ta）和银（Ag）对镍基复合材料机械性能和摩擦学性能的影响及机理，通过高能球磨和真空热压烧结方法制备样品，并考察其在宽温域（室温至1000℃）范围内的性能表现。结果表明，Ta的加入显著提升机械性能，归因于原位生成的TaC陶瓷相强化，而Ag元素则在宽温域内实现连续润滑，降低摩擦磨损。数据集由中国科学院兰州化学物理研究所发布，涉及摩擦学领域，提供实验数据和机理分析，适用于材料科学和摩擦学研究。