项目名称: 六角型MM'X合金中铁磁有序对结构相变的抑制行为研究
项目编号: No.51301195
项目类型: 青年科学基金项目
立项/批准年度: 2014
项目学科: 一般工业技术
项目作者: 刘恩克
作者单位: 中国科学院物理研究所
项目金额: 25万元
中文摘要: MM'X合金是一类新的磁相变材料,针对其优异性能的研究成为当前的研究热点之一。本申请项目针对MM'X合金中母相铁磁性对马氏体相变的强烈抑制这一重要物理行为,以铁磁学理论和马氏体相变理论为基础,采用"实验测量+第一性原理计算"相结合的研究方式,研究铁磁有序的建立对材料晶体结构、电子结构、化学成键、弹性性质及晶格振动的影响,揭示马氏体相变被铁磁态抑制的物理机理,深化对马氏体相变的影响因素及作用规律的认识,为新材料的发现和性能的提升提供研究依据和调控方法,具有重要的科学意义。在此基础上,本项目将利用铁磁性对结构相变的影响规律,尝试从铁磁态中对马氏体相变进行剥离,探索发现磁相变材料新体系,具有重要的实践意义。
中文关键词: 铁磁马氏体相变;形状记忆合金;磁-结构耦合;相变抑制;MM'X合金
英文摘要: As a new family of magnetostructural phase-transition materials, MM'X alloys have been intensively studied for the desired excellent properties. It is found that there is a strong suppression of martensitic transformation by the ferromagnetic ordering of austenite phase. In order to address and reveal the underlying physical mechanism, the current proposal intends to study the influence of the establishment of ferromagnetic ordering on the crystal structure, electronic structure, chemical bonding, elastic properties and lattice vibration, on the basis of the theories of ferromagnetism and martensitic transformation. The study is aiming at the influence factors and action rules, and is attempting to provide theoretical foundation and tuning methods for new materials and their good properties. Based on this, the current proposal will explore the new magnetostructural materials by separating the structural transition and the ferromagnetism. The current proposal exhibits important significance in terms of scientific researches and technological applications.
英文关键词: Ferromagnetic martensitic transformation;Shape memory alloy;Magnetostructural coupling;Phase transition suppression;MMX alloy