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: 1458074
• 负责人: Devesh Misra
• 金额: $ 33.83万
• 依托单位: University of Texas at El Paso
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-09-01 至 2017-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1458074&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.

技术概要：本研究项目的目标是确定在纳米级晶粒尺寸的金属中获得高强度和高延展性的基本标准。这些标准将阐明进行控制的机械变形实验，在不同的速率，使用纳米压头。随后，将通过显微镜工具检查压痕区域。实验利用随着晶粒尺寸减小而增加的主要组成相的稳定性。研究的标准定义了金属材料的主要组成相的稳定性是否负责管理高强度金属材料的延展性。变形行为的变化将作为从纳米晶粒制度通过传统的微米制度的晶粒尺寸的函数进行研究。基于晶粒尺寸和主要组成相的稳定性之间的关系，将开发具有预测能力的物理模型，用于广泛的材料系统。非技术摘要：这项研究的结果将扩展高强度，高延展性合金加工的最新技术，具有上级可成形性。高强度和高塑性复合材料的变形机制的理解对于指导未来强韧金属材料的发展具有重要意义。最终目标是确定指导方针，开拓新的前沿材料，用于涉及能量吸收和成形性的轻质高效解决方案。 此外，还将开发新技术来了解适用于其他金属系统的材料行为。研究生和本科生都将在该计划下接受金属研究方面的培训。高中生将通过暑期项目参与科学和技术。