冲击波致微结构演化对钛合金力学性能的影响

项目名称： 冲击波致微结构演化对钛合金力学性能的影响

项目编号： No.51501064

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 一般工业技术

项目作者： 任宇

作者单位： 华北电力大学

项目金额： 20万元

中文摘要： 钛合金在武器装备领域的应用日益广泛，在此类服役环境中，材料通常需承受强冲击波的作用。然而对钛合金的冲击波响应特性，尤其是冲击波致微结构演化对其力学性能的影响规律等科学问题认识上的不足，限制了该类材料在(高)超声速武器及高性能轻质防御装甲上的应用。本项目以具有不同组织的Ti–6Al–4V合金为研究对象，探究冲击波幅值(压力)对钛合金准静态及动态力学性能的影响规律，获得冲击波强化效果最佳的组织；揭示Ti–6Al–4V合金微结构及织构随冲击波幅值的演化过程，阐明冲击波致钛合金力学性能变化的材料学本质；构建包含冲击波参数及组织因素的可用于描述冲击波加载后钛合金动态力学行为的本构模型，同时发展对金属材料进行可控冲击波加载的相关实验技术。本课题关注组织类型和细节以及冲击波幅值对钛合金力学性能及微结构演化的影响，研究成果将为应用于极端载荷条件下钛合金的组织优化及相关结构件的设计提供理论支撑。

中文关键词： Ti-6Al-4V合金；冲击波加载；微结构演化；力学性能；动态本构方程

英文摘要： The application of titanium alloys in weaponry is increasingly widespread. The weaponry must be subjected to intense shock loads during service. However, the shock response characteristics of titanium alloys, especially the effect of microstructure evolution on the mechanical properties of titanium alloys under shock wave loading have not yet been well understood, which restricts the application of these materials in supersonic (or hypersonic) weapon and high performance light weight armor. In this research project, the shock response of the Ti–6Al–4V alloy with different microstructures will be systemically investigated. The effect of shock wave amplitude (pressure) on the postshock quasistatic and dynamic mechanical properties of this alloy will be explored. The optimal microstructure of this alloy which can be best shock-induced strengthened will be found out. The microstructure and texture evolution process of the Ti–6Al–4V alloy shock loaded at different pressure will be revealed. Then the nature of the variation in mechanical properties of this alloy will be clarified through microstructure analyses. The dynamic constitutive equation containing shock wave parameters and microstructure factors of the postshock Ti–6Al–4V alloy will be established. The experimental techniques involving controllable shock loading of metallic materials will also be improved. The influence of microstructure types and details and shock wave pressure on the evolution of mechanical properties and microstructures of titanium alloys is deeply concerned in this research project. After the completion of this research, the theoretical support will be provided for microstructure optimization of titanium alloys used in the extreme loading conditions and design of corresponding structures.

英文关键词： Ti-6Al-4V alloy;Shock wave loading;Microstructure evolution;Mechanical properties;Dynamic constitutive equation