Mechanical Mixing in Metallic Alloys During Ball Milling and Sliding Wear

这项资助探索了在高能球磨和干滑动磨损过程中导致金属合金机械混合的过程。这项工作的一个主要目标是阐明原子的过程中导致机械混合球磨，和它们的竞争与热分解的情况下，合金的正混合热。其目的是使用分析和高分辨率电子显微镜以及原子探针场离子显微镜的表征选定的镍基合金在受控条件下处理。该项目的目标是提高对自润滑材料的理解和开发，并将球磨过程中合金演变的研究结果应用于干滑动磨损固体的微观结构和化学演变。沿着实验研究，分子动力学模型将发展为改进的动力学模型和机械合金化的模拟。该项目的结果预计将导致结构纳米复合材料具有更好的性能。该项目的一个目标是通过实施和开发以学生教学为基础的教学方法，通过整合研究和教学，以及通过发展纳米级分辨率技术的合作，如电子显微镜和原子探针场离子显微镜，来扩大拟议工作的影响。计划与美国和国外的学术机构和实验室合作。*

This grant explores the processes leading to mechanical mixing in metallic alloys during high-energy ball milling and during dry sliding wear. A major objective of this work is to elucidate the atomistic processes leading to mechanical mixing during ball milling, and their competition with thermal decomposition in the case of alloys with positive heats of mixing. The aim is to use analytical and high-resolution electron microscopy as well as atom probe field ion microscopy for characterization of the selected Ni-based alloys processed under controlled conditions. A goal of the project is to improve the understanding and the development of self-lubricated materials, and to apply the findings on the evolution of alloys during ball milling to the microstructural and chemical evolution of solids undergoing dry sliding wear. Along with the experimental studies, molecular dynamics modeling will be developed for improved kinetic model and simulations of mechanical alloying.%%%The project results are expected to lead to structural nanocomposites with improved properties. A goal of the project is to broaden the impact of the proposed work by implementing and developing a student teaching-based instructional method, by integrating research and teaching, and by developing collaborations on techniques with nanometer-scale resolution, such as electron microscopy and atom probe field ion microscopy. Collaborations with academic institutions and laboratories in US and abroad are planned.***