The Role of Interfacial Structure in the Evolution of Precipitate Morphology

9303518雷诺这项研究考察了金属合金中沉淀形态的基本机制。作为界面取向函数的生长台阶形核动力学的测量提供了必要的信息，以统一当前发展沉淀形态的两个理论：沉淀形态的一般理论，它将沉淀形状与边界迁移率联系起来；不变线理论，它根据所涉及的相的结晶学来预测沉淀取向关系、生长方向和习惯面。对镍铬合金生长过程中析出相/基质晶界失配位错结构的实验观察，为部分共格晶界在固体中迁移的机制提供了信息。%这项研究的长期好处是了解了导致微结构演变的物理过程，这指导了商业金属合金的改进。***

9303518 Reynolds This research examines the fundamental mechanisms governing precipitate morphology in metal alloys. The measurement of growth ledge nucleation kinetics as a function of interphase boundary orientation provides necessary information to unify two current theories for the development of precipitate morphology: the general theory for precipitate morphology, which relates precipitate shape to boundary mobilities, and the invariant line theory, which predicts precipitate orientation relationships, growth directions, and habit planes from the crystallography of the phases involved. Experimental observation of the misfit dislocation structures at precipitate/matrix boundaries during growth in a nickel-chromium alloy provides information on mechanisms by which partially coherent boundaries migrate in solids. %%% The long term benefit of the research is understanding of the physical processes responsible for microstructural evolution, which guides improvement in commercial metal alloys. ***