Investigations of the Dynamics of Twinned Microstructures and the Formation of Martensite

孪晶微观结构动力学和马氏体形成的研究

• 批准号: 9312858
• 负责人: Phoebus Rosakis
• 金额: --
• 依托单位: Cornell University
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-09-01 至 1996-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9312858&HistoricalAwards=false
• 关键词: Investigations; Dynamics; Twinned; Microstructures; Formation

9312858 Rosakis This work studies the micromechanics of dynamic twin growth and the evolution of phase boundaries in crystalline alloys of engineering importance. The study of twinning is a prerequisite to the understanding of martensitic transformations and of the shape- memory effect. The general method of approach is base don the modern theory of nonlinear elastodynamics of materials that change phase. An important ingredient will be the choice of a constitutive law, namely a strain energy function which has many local minima (potential wells) as a function of strain and exhibits and appropriate type of anisotropy. A class of dynamic problems involving rapid propagation of twinned zones into untwinned crystals will be formulated and analyzed. ***

9312858 Rosakis这项工作研究动态孪晶生长的微观力学和工程重要性的结晶合金中相界的演变。 孪晶的研究是理解马氏体相变和形状记忆效应的先决条件。 一般的方法是基于现代相变材料的非线性弹性动力学理论。 一个重要的组成部分将是本构律的选择，即应变能函数，其具有作为应变的函数的许多局部最小值（势威尔斯），并表现出适当类型的各向异性。 一类动态问题，包括快速传播的孪晶区到非孪晶晶体将制定和分析。 ***