β钛合金的马氏体相变与力学行为的相关性研究

项目名称： β钛合金的马氏体相变与力学行为的相关性研究

项目编号： No.51271010

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 一般工业技术

项目作者： 赵新青

作者单位： 北京航空航天大学

项目金额： 90万元

中文摘要： 由于马氏体相变在改善材料力学性能和实现功能特性方面的重要作用，马氏体相变与力学行为的关系一直是材料科学与工程领域的关键问题。我们在近期的实验研究中发现，TiNb系β钛合金中的马氏体相变与合金的力学行为，特别是与合金的强度和弹性模量具有高度相关性；通过热诱发和应力诱发马氏体相变并辅以热-机械处理，可使β钛合金兼具高强度和低（或超低）弹性模量，这为新型高强低弹模β钛合金设计提供了新思路。阐明与此相关的物理机制具有很高的学术价值，对研发具有重要应用前景的低弹模钛合金和高弹性钛合金具有指导意义。本项目旨在以TiNb系β钛合金为研究对象，弄清楚β钛合金的结构稳定性、马氏体相变与合金力学行为之间的相关性，研究马氏体相变、析出相变和微观组织演变对TiNb系亚稳β钛合金的力学性能的影响规律，揭示马氏体相变和力学行为相关性的内在机制，丰富和深化β钛合金中的马氏体相变研究，为新型β钛合金设计和研发奠定基础。

中文关键词： 亚稳β钛合金；马氏体相变；弹性模量；强度；

英文摘要： Because of the important role of martensitic transformation played in the improvement of mechanical properties of materials and the realization of functional performance, the relationship between the martensitic transformation and the mechanical behavior has been a key issue in materials science and engineering. It was found in recent experimental study that the martensitic transformation in TiNb based β Ti alloys is closely related to their mechanical behavior, especially the strength and the elastic modulus. By athermal martensitic transformation and stress induced martensitic transformation as well as proper thermo-mechanical treatment, the β Ti alloys could gain high strength and low elastic modulus. This provides a novel approach to the design of advanced β Ti alloys with high strength and low modulus. It is of academic importance to clarify the relative mechanism, and of engineering significance to develop novel Ti alloys with high elasticity and the Ti alloys with low modulus. The aim of the present study is to clarify the relationship between the structural stability, martensitic transformation and the mechanical properties of TiNb based β Ti alloys, and to determine the effect of martensitic transformation, precipitation and microstructure on the mechanical behavior. In addition, in the present study th

英文关键词： metastable β-type Ti alloys；martensitic transformation；elastic modulus；strength；