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.

技术摘要：该研究项目的目的是确定晶粒尺寸在纳米范围内的金属获得高强度和高延展性组合的基本标准。这些标准将通过使用纳米压痕仪以不同速率进行受控机械变形实验来阐明。随后，将通过显微镜工具检查凹进区域。实验利用随着晶粒尺寸的减小而增加主成分相的稳定性。研究的标准定义了金属材料主要成分相的稳定性是否负责控制高强度金属材料的延展性。变形行为的变化将作为晶粒尺寸的函数进行研究，从纳米晶态到传统微米态。将根据晶粒尺寸和主要成分相稳定性之间的关系，开发对各种材料系统具有预测能力的物理模型。非技术摘要：这项研究的结果将扩展加工的最新技术具有优异成形性能的高强度、高延展性合金。了解高强度和高延展性相结合的变形机制预计对于指导未来高强度和延展性金属材料的开发具有重要意义。最终目标是确定指导方针，开拓材料新领域，以实现涉及能量吸收和可成型性的轻型和高效解决方案。 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技术活动。