Nucleation and Growth of Solid-State Transformations

固态转变的成核和生长

• 批准号: 8820116
• 负责人: Gregory Olson
• 金额: $ 34.62万
• 依托单位: Northwestern University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-02-15 至 1992-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8820116&HistoricalAwards=false
• 关键词: Nucleation; Growth; Solid; State; Transformations

First-order phase transformations, as typified by the martensite reaction, are being examined. The interrelation of discrete dislocation and nonlinear continuum diffuse interface models of interfacial core structure is investigated theoretically and experimentally in model martensitic systems. A nonlinear nonlocal continuum theory explores the competition between nucleation and continuous modulation modes of first-order transformations. Transmission electron microscopy investigation of ferrite interfaces assists in defining the interfacial structure. Homogeneous nucleation experiments are performed in submicron austenitic particles, using high magnetic fields to supply additional thermodynamic driving force.

以马氏体反应为代表的一阶相变正在研究中。本文从理论和实验两方面研究了马氏体模型中离散位错与非线性连续扩散界面模型的相互关系。一个非线性非局部连续统理论探讨了一阶变换的成核模式和连续调制模式之间的竞争。透射电镜对铁氧体界面的研究有助于确定界面结构。在亚微米奥氏体颗粒中进行了均匀成核实验，利用高磁场提供额外的热力学驱动力。