The Interplay Between Grain Size and Austenite Stability on Constitutive Deformation Behavior of High Strength-High Ductility Combination Nanostructured Materials

晶粒尺寸和奥氏体稳定性之间的相互作用对高强度-高延性组合纳米结构材料本构变形行为的影响

• 批准号: 1261883
• 负责人: Devesh Misra
• 金额: $ 34.5万
• 依托单位: University of Louisiana at Lafayette
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-09-01 至 2014-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1261883&HistoricalAwards=false
• 关键词: Interplay; Between; Grain; Size; Austenite

TECHNICAL SUMMARY:The objective of this research project is to determine the fundamental criteria for obtaining a combination of high strength and high ductility in metals with grain sizes in the nanometer range. These criteria will be elucidated by conducting controlled mechanical deformation experiments at different rates using a nanoindenter. Subsequently, the indented region will be examined via microscopy tools. Experiments utilize the increasing the stability of the principal constituent phase with decreasing in grain size. The criteria investigated define if the stability of the principal constituent phase of the metallic material is responsible for governing the ductility of high-strength metallic materials. Changes in deformation behavior will be studied as a function of grain size from the nanograin regime through the conventional micrometer regime. Physical models with predictive capabilities for a wide range of material systems based on the relationship between grain size and stability of the principal constituent phase will be developed.NON-TECHNICAL SUMMARY:The results of this research will extend the state-of-art for processing of high-strength, high-ductility alloys with superior formabilities. The understanding of deformation mechanisms underlying combined high strength and high ductility is expected to be important in guiding the development of future strong and ductile metallic materials. The ultimate objective is to determine guidelines to pioneer a new frontier of materials for light and efficient solutions involving energy absorption and formability. Furthermore, new techniques will be developed to understand material behavior that will be applicable to other metallic systems. Both graduate and undergraduate students will be trained in metals research under this program. High-school students will be engaged in science and technology through summer programs.

技术摘要：该研究项目的目的是确定获得高强度和高延展性在纳米范围内的晶粒尺寸的基本标准。这些标准将通过使用纳米内输入以不同的速率进行控制的机械变形实验来阐明这些标准。随后，将通过显微镜工具对缩进区域进行检查。实验利用了主组成相的稳定性，随着晶粒尺寸的减少。研究的标准确定了金属材料的主要成分阶段的稳定性是否负责管理高强度金属材料的延展性。变形行为的变化将根据纳米晶型从常规千分尺制度的晶粒大小进行研究。基于晶粒尺寸与主组成阶段的稳定性之间的关系，具有预测能力的物理模型将开发出来。Non-non-technical摘要：这项研究的结果将扩展到处理高强度，高连接能力的最先进的效果。预计对高强度和高延展性组合的变形机制的理解对于指导未来强和延性金属材料的发展至关重要。最终目的是确定指南，以优先为涉及能量吸收和形成性的轻有效解决方案的新材料前沿。 此外，将开发新技术以了解适用于其他金属系统的物质行为。根据该计划，研究生和本科生都将接受金属研究的培训。高中生将通过夏季课程从事科学技术。