Mechanics of Nanocrystalline Materials

对某些纳米晶金属的初步实验表明，在室温下，它们的强度可以比我们工业中使用的粗晶材料提高4-5倍。但每种材料的确切增加量和出现这种最佳强度的确切晶粒度尚不清楚，还有其他因素可能影响达到最佳强度。在这个项目中，我们将开发基于细观力学的模型，以寻找在室温和高温下金属和陶瓷都能获得最高强度和延展性的最佳条件。这一研究成果将对我国超强、耐高温、高延性材料的生产产生重大影响。我们还计划向本科生和研究生介绍纳米力学这门课程，让他们为下一代纳米技术做好准备。

CMS-0510409, Mechanics of Nanocrystalline Materials, by George J. WengAbstract Preliminary experiments on certain nanocrystalline metals have indicated that, at room temperature, their strength could increase by 4-5 times as compared to the coarse-grained materials that we are using in our industry. But the precise amount of increase for each material and the exact grain size at which such optimal strength could occur, are not known, and there are other factors that could affect the attainment of the optimal strength. In this project we will develop micromechanics-based models to search for such optimal conditions that lead to the highest possible strength and ductility at both room and high temperature, for both metals and ceramics. The outcome of this research will have significant impact to our industry in the production of super strong, high-temperature resistant, and high ductility materials. We also plan to introduce the subject of nano-mechanics to our undergraduate and graduate students, to prepare them for the next generation of nanotechnology.