Co-V基Heusler合金的相稳定性及其磁致形状记忆性能的研究

Heusler磁致形状记忆合金具有广阔的应用前景，是近年来材料领域的研究热点之一，但还鲜有Co基Heusler磁致形状记忆合金的报道。本项目拟采用第一性原理系统地评估Co-V基Heusler合金中的相稳定性和马氏体相变的可能性，并进行实验验证；通过相平衡实验测定与热力学计算，建立Co-V基Heusler合金体系热力学数据库。并对Co-V基Heusler合金中马氏体相关结构、马氏体相变及稳定性和磁致形状记忆性能进行研究，揭示Co-V基Heusler合金中马氏体相变和磁致形状记忆特性的机理及影响因素。结合第一性原理和相平衡信息，对合金成分进行优化设计，阐明合金化和热处理工艺等对Co-V基Heusler合金的结构、马氏体相变及磁致形状记忆效应的影响规律。通过本项目的研究，可拓宽Heusler磁致形状记忆合金的体系，有望研发新型的Co-V基Heusler磁致形状记忆合金。

Heusler magnetic shape memory alloy becomes one of hot spots in the field of materials for its functional applications. To the best of our knowledge, however, Co-based Heusler magnetic shape memory alloy has been rarely reported until now. The aim of this project is to theoretically assess using first principles calculations and experimentally confirm the phase stability and the possibility of martensitic transformation in the Co-V based Heusler alloys. Then the Co-V based Heusler alloying database will be established via phase equilibria and thermodynamic assessment. Through the thermodynamic databases, the crystal structure, martensitic transformation and magnetic shape memory property of Co-V based Heusler alloys will be studied to understand their corresponding influence mechanism. Combining with the first principles calculations and the information of phase equilibria, the alloying composition will be optimized and the influences of alloying and heat treatment on the crystal structure, martensitic transformation and magnetic shape memory property will be explained. Through this project, the study on the Heusler magnetic shape memory alloy and martensitic transformation would be extended. The purpose of this work is to develop a new kind of Co-V based Heusler magnetic shape memory alloys.