延性金属动态拉伸断裂的微结构演化研究

项目名称： 延性金属动态拉伸断裂的微结构演化研究

项目编号： No.U1330111

项目类型： 联合基金项目

立项/批准年度： 2014

项目学科： 数理科学和化学

项目作者： 祁美兰

作者单位： 武汉理工大学

项目金额： 82万元

中文摘要： 在动载荷作用下，材料的拉伸破坏始于内部稀疏波相互作用产生的拉伸应力引起的微孔洞或裂纹，而微孔洞或裂纹的出现位置和数量与材料微结构密切相关，比如位错、晶界或夹杂往往会成为材料破坏的起源。深入认识拉伸应力下材料微结构的动态演化机理和规律，探索和建立一个能够连接不同尺度且具有预测能力的材料失效理论模型，实现对材料从其行为的“观察”转变到对其性能的“控制”，不仅是提高材料研究和设计水平的必要前提，而且对提高国防装备及民用材料的强度和性能均具有重要意义。本项目拟在传统方法的基础上，利用申请人目前所掌握的先进实验和测试技术，并与美国Argonne国家实验室合作，拟将同步辐射X射线静态和动态原位测试技术用于延性金属微结构动态演化机理的研究中，为探索和建立与材料微细观结构相关的损伤演化模型提供更为真实可靠的实验数据。

中文关键词： 延性金属；动态损伤演化；同步辐射；损伤断裂模型；

英文摘要： Under dynamic loading, tensile stress will be produced due to the rarefaction wave interaction inside the material and tensile fracture in materials will start from the microvoids or cracks caused by tensile stress. The location and quantity of macrovoids or cracks are closely related to microstructure of the material, such as dislocations, grain boundaries and inclusions. In-depth understanding of mechanism and laws of the microstructure dynamic evolution, exploring and establishing a failure theoretical model with predictive ability which can connect different scale, achieving the transition from “observation” to “control” for the material, not only is necessary for raising the level of material research and design, but also is significant for improving the strength and performance of defense equipment and civilian materials. Based on the traditional methods, advanced experimental and test technology mastered by applicant , and cooperation with the U.S. Argonne National Laboratory, the applicant intends to apply static and dynamic in-situ measurements of synchrotron radiation X-ray to the study of the dynamic evolution mechanism of microstructure for ductile metal, which can provide more realistic and reliable experimental data for exploring and building a damage evolution model related to the microstructure o

英文关键词： Ductile metal；Dynamic damage evolution；synchrotron radiation；Damage and fracture model；