多相合金层裂过程中的相界面效应

Spallation is one of the important dynamic damage models and is also the research focus in the current academic fields. In order to reveal its process essence at different structural levels , the following work will be carried out based on multi-disciplinary alliance especially materials science perspective as well as theoretical/experimental coupling method, and the XRCT、SEM/EBSD, quantitative OM ,one-stage light gas gun, DPS and other advanced experimental techniques will be integrated used in the present project. The effects and evolution mechanism of microstructure characteristics such as the properties, orientation and shape of the second phase will be investigated during the dynamic tensile fracture process based on the multi-scale/ multidimensional observations and analysis. The dynamic tensile fracture model that can associate different scale/dimension and physical description will be suggested in this work. New discoveries and breakthroughs in the correlation of the phase interface and spallation which have not been explored in the past are expected to be achieved.. The controlling principle and technique in materials science for the dynamic tensile fracture will try to be developed. The material dynamic damage and fracture theories will be enriched and developed, and the experimental support and theoretical guidance about spallation controlling will be provided by the above researches.

层裂是材料动态损伤断裂的重要模式之一，是当下学界研究热点。为揭示这一贯穿不同尺度/维度的过程本质，本项目立足于材料科学并交融冲击动力学、损伤断裂力学等多学科的视角以及理论-实验相耦合的方法，聚焦前人少有研究的多相合金层裂行为中的“相界面效应”，综合运用SR-XRCT、TEM、EBSD/SEM、OM、DPS、一级轻气炮等先进实验技术，在多尺度/多维度实验观测分析基础上，对“相界面”的性能、组分、取向、形状等特征参量对多相合金层裂微孔洞的形核-长大-贯通的作用规律与机理予以透视与剖析，期待在前人尚未探究的“相界面”与多相合金层裂的相互作用规律与机制等方面有新发现和突破，并力图构建既关联不同尺度/维度又具有物理描述能力的多相合金层裂理论模型。 本项目的知识创新将拓展现有基于准静态载荷的材料科学/损伤断裂理论的内涵和外延、丰富和发展动态损伤断裂理论，为材料动态损伤断裂的调控提供实验支撑和理论指导。

层裂是材料动态损伤断裂的重要模式之一，是当下学界研究热点。本项目立足于材料科学并交融冲击动力学、损伤断裂力学等多学科的视角以及理论-实验相耦合的方法，聚焦前人少有研究的多相合金层裂行为中的“相界面效应”，以Fe50Mn30Co10Cr10高熵合金和双相钢为模型合金，综合运用EBSD/SEM、OM、DPS、一级轻气炮、滑移爆轰加载等先进实验技术，系统和深入地研究了“相界面”、“相组分”、“晶界”等对多相合金层裂微孔洞的形核-长大-贯通的作用规律与机理，在前人尚未探究的“相界面”与多相合金层裂的相互作用规律与机制等方面有新发现和突破，揭示了影响多相合金层裂行为的“相界面效应”。.研究表明：层裂孔洞不是如传统损伤理论所预测的那样、形核于相界面上，而是形核于冲击阻抗高的第二相内；相组分、残余应力对孔洞形核-长大-贯通以及层裂强度有直接影响；∑3n晶界对孔洞形核的抵抗力高。.本项目的知识创新将拓展现有基于准静态载荷的材料科学/损伤断裂理论的内涵和外延、丰富和发展动态损伤断裂理论，为材料动态损伤断裂的调控提供实验支撑和理论指导。