应变玻璃窄滞后超弹性性能的相场模拟与实验研究

项目名称： 应变玻璃窄滞后超弹性性能的相场模拟与实验研究

项目编号： No.51201125

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 金属材料学科

项目作者： 王栋

作者单位： 西安交通大学

项目金额： 25万元

中文摘要： 应变玻璃态是在形状记忆合金中发现的一种新的局部晶格应变被冻结的无序态[PRL 95, 205702(2005)]，并且表现出不同于正常马氏体的功能特性特性，如纳米畴结构、频率弥散特性、窄滞后等，这些特性表明应变玻璃转变在基础研究和新材料开发上的巨大潜力。如何通过应变玻璃的功能特性来开发窄滞后超弹性合金，即如何通过引入广义缺陷来控制形状记忆合金中的应变玻璃转变行为，并通过应变玻璃转变的功能特性来开发和设计大应变、窄滞后、宽温域超弹性性能的形状记忆合金在基础和应用研究方面都有重要价值。应变玻璃转变微观物理模型的建立以及相场动力学模拟的方法的完善[PRL 105,205702(2012)]为解决上述问题提供了可能。因此，本项目拟在已有的研究基础上，通过理论与实验相结合的方法，研究广义缺陷在应变玻璃转变中的作用，建立缺陷，应变玻璃和窄滞后超弹性性能的相场模型，指导实验开发和设计窄滞后超弹性材料。

中文关键词： 形状记忆合金；马氏体相变；应变玻璃；相场法；缺陷

英文摘要： Strain glass is a new form of glass state found in shape memory alloys[PRL 95,205702(2005)]. It is a frozen state of local lattice strains. Being different from a normal martensitic crystal, strain glass exhibits novel properties such as nano-martensitic domains, frenquency dispersion, slim hysteresis. These features indicate that strain glass may have a potential for fundamental research and promising applications. However, the study about mechanism of strain glass transiton is still unclear, which restricts the development of new strain glass alloys. Recently established strain glass model and simulation [PRL 105,205702(2010)] which assumes that point defects alter the theromdynamic stability of martensite and create local lattice distortion,provide a opportunity to study strain glass and related novel properties. Beased on previous study, oiur projedt will focus on the study of the role of different defects on strain glass transition and develop novel mechanical properties with slim hysteresis and large temperature range. The proposed project will integrate experimental and simulation study, to explore dislocation/precipitates induced new strain glass alloys; and to explore superelastic behavior with nearly vanishing hysteresis and wide temperature range in shape memory alloys through experimental measurem

英文关键词： Shape memory alloys；Martensitic transformation；Strain glass；Phase field；Defects