冲击载荷作用下高强韧钛合金的动态力学性能及破坏行为研究

Titanium alloy is a kind of important structural material in aerospace industry and can be used in military aircraft and aircraft engines as key materials. In this project，a kind of two-phase titanium alloy with high strength and toughness were considered for the following research: 1.Conducting quasi-static and dynamic experiments for the titanium alloy at different strain rates and temperatures and analyzing the effects of the strain rate and temperature on the macro-mechanical behavior of the titanium alloys. 2.Using SEM, TEM and EBSD to investigate the fracture characteristics and deformation mechanisms of the titanium alloy at different strain rates and temperatures, exploring the evolution laws and micro-fracture mechanisms of the microstructures of the titanium alloy. 3. Establishing a constitutive model with damage evolution equations for the titanium alloy by considering strain rates and temperatures. 4.Based on microscopic analysis, investigating the relationship between deformation twinning and temperatures, strains, and strain rates, discussing the effects of dislocation slip and deformation twinning on the macro-mechanical properties of the titanium alloy, giving a crystal plasticity model which can be used to accurately predict the mechanical behavior of the titanium alloy. The research conducted by this project will provide experimental data and theoretical basis for the engineering application and performance optimization of the titanium alloy.

钛合金是航空航天工业中一种重要的结构材料，是制造航空航天飞行器框架结构和航空发动机等部件的关键材料，本项目以高强高韧两相钛合金TC21为研究对象进行如下研究：一、实施高强韧钛合金在不同温度和应变率条件下的准静态和动态冲击实验，分析温度和应变率及其耦合特性对钛合金宏观力学性能的影响；二、利用SEM、TEM和EBSD对钛合金材料在不同温度和应变率下的断裂方式和变形机理进行研究，给出材料微观结构的演化规律和微观断裂机制；三、建立钛合金在冲击载荷作用下计及应变率、温升效应的动态损伤本构关系；四、基于微观分析，建立温度、应变及应变率与孪晶变形机制间的关联，深入探讨钛合金材料的位错滑移和形变孪晶两种不同变形机制对钛合金宏观力学性能的影响，建立能够准确描述钛合金力学行为的晶体塑性模型。通过本项目研究工作开展，有望为钛合金材料的工程应用及性能优化提供可靠的实验数据和理论支撑。

钛合金在航空航天、军事工业、医疗、船舶制造等行业有着广泛的应用，是制造航空航天飞行器框架结构和航空发动机等部件的关键材料。本课题以高强高韧两相钛合金TC21为研究对象，进行了如下研究：一、实施了钛合金在不同温度和应变率条件下的准静态和动态冲击实验，分析温度和应变率及其耦合特性对钛合金宏观力学性能的影响；二、完成了不同生产方式的钛及钛合金材料在不同应变率条件下的加载实验，并利用扫描电子显微镜（SEM）对钛合金材料在不同温度和应变率下的断裂方式和变形机理进行研究，给出材料微观结构的演化规律和微观断裂机制；三、基于微观分析，建立温度、应变及应变率与滑移、孪晶变形机制间的关联，深入探讨钛合金材料的位错滑移和形变孪晶两种不同变形机制对钛合金宏观力学性能的影响，建立能够准确描述钛合金力学行为的晶体塑性本构关系。通过本项目研究工作的开展，为钛合金材料的工程应用及性能优化提供了可靠的实验数据、理论支撑和模拟方法。