U.S.-Czech Materials Research on Metastable Structures in the Intermetallic Compound TiAl

INT 9605232 Vitek 这个美国-宾夕法尼亚大学的Vaclav Vitek和他的合作伙伴捷克物理研究所的Vaclav Paidar以及捷克材料物理研究所的Mojmir Sob之间的捷克研究项目将研究片状TiAl（钛铝）中的亚稳结构，这是一种韧性金属间化合物。 该研究计划需要分析由大规模扭曲产生的配置，这些扭曲将初始结构转换为具有不同对称性的新结构。将考虑两种类型的失真：1）大的均匀应变和2）原子平面的洗牌。 这项合作工作有望产生有关这些原子界面结构的新知识，特别是连接界面的晶格转变，包括位错和孪核。 结果将有助于解释高的韧性和韧性的层状TiAl的特征结合在一个理想的晶格和缺陷区域。 这样的信息可能是有用的，在未来生产的强大，轻密度耐高温金属间化合物的旋转机械和航空航天应用。 该材料研究项目通过使美国和东欧的领先专家能够在具有强烈共同兴趣和能力的领域联合收割机互补人才并汇集研究资源，实现了推进科学知识的计划目标。 ??

INT 9605232 Vitek This U.S.-Czech research project between Vaclav Vitek of the University of Pennsylvania and his partners, Vaclav Paidar of the Czech Institute of Physics and Mojmir Sob of the Czech Institute of the Physics of Materials, will examine metastable structures in the lamellar TiAl (titanium aluminum), a ductile intermetallic compound. The research plan entails analyzing configurations produced by large scale distortions that transform the initial structure creating new structures with different symmetries. Two types of distortions will be considered: 1) large homogeneous straining and 2) shuffling of atomic planes. The collaborative work is expected to yield new knowledge about these atomic interfacial structures, specifically, the lattice transformations connecting the interface, including dislocations and twin nuclei. Results will help explain the high ductility and toughness of the lamellar TiAl by characterizing the bonding in an ideal lattice and in defective regions. Such information may be useful in future production of strong, light density-high temperature tolerant intermetallic compounds for rotating machinery and aerospace applications. 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 research resources in areas of strong mutual interest and competence. ??