Mechanical Mixing in Metallic Alloys During Ball Milling and Sliding Wear

这项资助探讨了在高能球磨和干滑动磨损期间导致金属合金机械混合的过程。本工作的一个主要目的是阐明导致球磨过程中机械混合的原子过程，以及它们与具有正混合热的合金的热分解的竞争。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来表征在受控条件下加工的选定镍基合金。该项目的目标是提高对自润滑材料的理解和发展，并将球磨过程中合金演变的研究结果应用于固体干滑动磨损的微观组织和化学演变。在实验研究的基础上，分子动力学建模将用于改进力学合金化的动力学模型和模拟。该项目的结果有望导致具有改进性能的结构纳米复合材料。该项目的目标是通过实施和发展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（如电子显微镜和原子探针场离子显微镜）的合作，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.***