CAREER: Fundamental investigation of twin boundary engineering through cyclic cross-phase-boundary thermomechanical processing

职业：通过循环跨相边界热机械加工对孪晶边界工程进行基础研究

• 批准号: 2240125
• 负责人: Lei Cao
• 金额: $ 55.49万
• 依托单位: Board of Regents, NSHE, obo University of Nevada, Reno
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-07-01 至 2028-06-30
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2240125&HistoricalAwards=false
• 关键词: CAREER; Fundamental; investigation; twin; boundary

NONTECHNICAL SUMMARYThis Faculty Early Career Development (CAREER) award supports research and education activities to develop material processing strategies to manufacture stronger and/or more ductile titanium (Ti) alloys. The mechanical properties of Ti alloys are significantly affected by the defects and other fine structures present in the material, which are challenging to predict or design. In this project, the principal investigator and her team will develop models at different length scales to computationally predict the evolution of fine structures in Ti alloys under thermal and mechanical loadings. The research will lead to strategies to rationally produce fine structures in Ti alloys, thus obtaining desired mechanical properties, which will benefit aerospace, automotive, and other industries that have an increasing demand of Ti alloys. This project will tightly integrate research and educational activities, including science exhibits, curriculum development, research mentoring, online education, and research tool sharing, with an overarching theme of “strong and ductile metal alloys” to train a diverse body of students at the K-12, undergraduate, and graduate levels toward fostering a scientific workforce with integrated knowledge of materials and mechanics. The project will make the developed education modules and research tools accessible to both online and in-person participants.TECHNICAL SUMMARYThis CAREER award supports research and education activities aimed at establishing physics-based thermomechanical processing pathways to rationally create desired microstructures in Ti alloys. Mechanical properties of Ti alloys are directly determined by their microstructures, including twin boundaries, dislocations, phase boundaries, and grain boundaries. It is, therefore, imperative to develop effective thermomechanical processing strategies to control microstructures in Ti alloys. To achieve this goal, the PI and her team will pursue three research thrusts that focus on (i) elucidating microstructure formation mechanisms in Ti alloys using atomistic simulations and first-principles calculations; (ii) upscaling the atomistic mechanisms of microstructure evolution to macroscopic mechanics through phase-field finite element modeling; and (iii) developing cross-phase-boundary thermomechanical pathways to control the formation of microstructures in Ti alloys. The project will advance the fundamental understanding and modeling of microstructure evolution in Ti alloys, accelerating the development of thermomechanical processing approaches and alloy compositions of Ti alloys. This project will tightly integrate research and educational activities, including science exhibits, curriculum development, research mentoring, online education, and research tool sharing, with an overarching theme of “strong and ductile metal alloys” to train a diverse body of students at the K-12, undergraduate, and graduate levels toward fostering a scientific workforce with integrated knowledge of materials and mechanics. The project will make the developed education modules and research tools accessible to both online and in-person participants.This project is jointly funded by the Division of Materials Research (through the Condensed Matter and Materials Theory and Metals and Metallic Nanostructures programs) and the Division of Civil, Mechanical, and Manufacturing Innovation (through the Mechanics of Materials and Structures program).This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

非技术总结早期职业发展（职业）奖支持研究和教育活动，以制定材料处理策略，以制造更强和/或更多的延性钛合金（TI）合金。 Ti合金的机械性能受到材料中存在的缺陷和其他细胞结构的显着影响，这些缺陷和预测或设计挑战。在这个项目中，主要研究人员和她的团队将开发不同长度尺度的模型，以预测在热和机械载荷下Ti合金中精细结构的演变。这项研究将导致在TI合金中合理生产精细结构的策略，从而获得所需的机械性能，这将使对TI合金需求不断增长的航空航天，汽车和其他行业有益。该项目将紧密整合研究和教育活动，包括科学展览，课程发展，研究心理，在线教育和研究工具共享，以及“强和延性金属合金”的总体主题，以培训K-11的多样化学生，本科生，研究生和研究生水平，以促进具有材料和机械知识的科学工作。该项目将使在线和面对面参与者都可以访问发达的教育模块和研究工具。技术摘要这一职业奖支持研究和教育活动，旨在建立基于物理学的热力学处理途径，以理性地在TI合金中创建所需的微观结构。 Ti合金的机械性能由它们的微观结构直接确定，包括双边界，位错，相边界和晶界。因此，必须制定有效的热机械加工策略来控制Ti合金中的微观结构。为了实现这一目标，PI和她的团队将采用三项研究推力，以（i）使用原子模拟和第一原理计算来阐明TI合金中的微观结构形成机制； （ii）将微观结构演化的原子机制通过相位磁场有限元建模升级到宏观力学； （iii）开发跨相结合的热机械途径，以控制Ti合金中微观结构的形成。该项目将推进TI合金中微结构演化的基本理解和建模，从而加速了Ti合金的热机械加工方法和合金组成的发展。该项目将紧密整合研究和教育活动，包括科学展览，课程发展，研究心理，在线教育和研究工具共享，以及“强和延性金属合金”的总体主题，以培训K-11的多样化学生，本科生，研究生和研究生水平，以促进具有材料和机械知识的科学工作。该项目将使在线和面对面参与者都可以访问发达的教育模块和研究工具。该项目由材料研究部共同资助（通过凝聚的物质和材料理论，金属，金属以及金属纳米结构计划）以及公民，机械和机械的部门，并通过使用材料和结构的机制来代表N.基金会的智力优点和更广泛的影响评论标准。