The thermal stability of nanocrystalline alloys produced by severe plastic straining

剧烈塑性应变制备纳米晶合金的热稳定性。一种令人兴奋的材料已经出现，它的晶粒尺寸比传统工艺生产的材料细两个数量级。这些纳米晶合金是通过称为等通道角挤压（ECAE）的强塑性应变生产的。该项目的目的是结合新的实验技术，使用单晶，原位退火和3-D计算机模拟，以发展对ECAE和随后热处理过程中微观结构稳定性的基本理解。我们对精细微结构边界迁移率的理解取得的这些进展对于评估它们的稳定性以及这些材料可能的商业开发非常重要。

The thermal stability of nanocrystalline alloys produced by severe plastic straining. An exciting class of materials has emerged with grain sizes two orders of magnitude finer than that produced by conventional processing. These nanocrystalline alloys are produced by intense plastic straining termed equal channel angular extrusion (ECAE). The aim of the project is to incorporate novel experimental techniques, using single crystals, in situ annealing and 3-D computer simulation to develop a fundamental understanding of microstructural stability during ECAE and subsequent thermal treatment. Such advances in our understanding of boundary mobility in fine-scale microstructures is important for evaluating their stability and, hence, the possible commercial exploitation of these materials.