U.S.-Czech Materials Research on Atomic Structure of Asymmetrical Grain Boundaries and Nucleation of Phase Transformation at Grain Boundaries

9307418 Vitek这个美国和捷克的研究项目是由宾夕法尼亚大学的Vaclav Vitek博士和捷克科学院物理研究所的Vaclav Paidar博士共同完成的。研究人员试图在更一般的不对称边界的结构和性质之间建立联系，以及不同边界结构之间的关系。在相当特殊的短周期边界的结构和性质与一般性质的边界之间建立联系，对于扩展目前关于边界性质的原子性研究具有重要意义。研究人员还将研究晶界上新的三维相的形核和晶界上发生的动态过程。在此过程中，他们将使用原子水平弹性模量的概念来评估相应结构的稳定性，该概念早前在Vitek教授的研究中得到了NSF的支持。这些结果将有助于我们了解影响金属和陶瓷材料结构和性能的非对称晶界结构。这个材料研究项目通过使美国和东欧的顶尖专家在共同感兴趣和能力强的领域结合互补的人才和汇集资源，实现了推进科学知识的计划目标。

9307418 Vitek This U.S.- Czech research project is between Dr. Vaclav Vitek of the University of Pennsylvania and Dr. Vaclav Paidar of the Czech Academy of Sciences' Institute of Physics. The researchers seek to establish a link between the structure and properties of more general, asymmetrical boundaries, and the relationships between structures of different boundaries. Establishing a link between the structure and properties of rather special, short period boundaries and boundaries of general nature is of principal importance for extension of the present atomistic studies of boundary properties. The researchers will also study the nucleation of new three-dimensional phases at grain boundaries and dynamic processes taking place at grain boundaries. In the process, they will assess the stability of the corresponding structures using the concept of atomic level elastic moduli, advanced earlier in Prof. Vitek's research supported by NSF. Results are expected to contribute to our knowledge of non-symmetric grain boundary structures, which can effect the structure and properties of metallic and ceramic materials. This project in materials research fulfills the program objective of advancing scientific knowledge by enabling leading experts in the United States and Eastern Europe to combine complementary talents and pool resources in areas of strong mutual interest and competence.