Thermodynamics and Kinetic Theory of Structural Transformations in Metal and Ceramic Systems

金属和陶瓷系统结构转变的热力学和动力学理论

• 批准号: 9123167
• 负责人: Armen Khachaturyan
• 金额: $ 30万
• 依托单位: Rutgers University New Brunswick
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-07-01 至 1996-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9123167&HistoricalAwards=false
• 关键词: Thermodynamics; Kinetic; Theory; Structural; Transformations

Theoretical studies will be done on the thermodynamics and kinetics of morphological and structural transformations in technologically advanced materials, multiphase metal alloys with intermetallics and in ceramic systems. An understanding of underlying mechanisms of atomic and structural transformations is crucial for processing and materials design. An evolution of the atomic structure as well as mesoscale pattern formation along the transformation path will be considered. The emphasis will be on the decomposition and ordering which results in a reduction of the point group symmetry. The problem of transient metastable phases and their relation to the mesoscale structure will be addressed. We will concentrate on attacking problems concerning precipitation of non-cubic ordered intermetallic phases from a cubic matrix, strain-induced coarsening, mesoscale pattern formation, problems involving virtual metastable phases, and structure formation in ceramic systems. %%% Theoretical studies utilizing analytical and computational techniques will be done to understand the structural transformations which occur in metals and ceramics. A knowledge of these transformations is important in the processing of these advanced materials in order to correlate materials properties to the underlying crystal structure.

对反应的热力学和动力学进行了理论研究 形态和结构的转变， 先进的材料，多相金属合金与金属间化合物和 在陶瓷系统中。 了解潜在的机制， 原子和结构转换对于处理和 材料设计 原子结构的演变以及 中尺度模式的形成沿着转换路径将是 考虑了 重点将放在分解和排序 这导致点群对称性的降低。 的 瞬态亚稳相的问题及其与 中尺度结构将得到解决。 我们将集中于 关于非立方有序粒子沉淀的攻击问题 来自立方基体的金属间相，应变诱导的 粗化，中尺度模式的形成，虚问题 介稳相和陶瓷系统中的结构形成。 %%% 理论研究利用分析和计算 技术将被用来理解结构 发生在金属和陶瓷中的相变。 的知识 这些转换在处理这些 先进的材料，以便将材料性能与 底层的晶体结构