Collaborative Research: Engineering Gradient Nanostructured Metals by Multi-Pass Plastic Wave Deformation

合作研究：通过多通道塑性波变形工程梯度纳米结构金属

• 批准号: 2102093
• 负责人: Lei Chen
• 金额: $ 15.5万
• 依托单位: Regents of the University of Michigan - Dearborn
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-10-01 至 2024-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2102093&HistoricalAwards=false
• 关键词: Collaborative; Research; Engineering; Gradient; Nanostructured

This award supports research to understand a novel and scalable surface deformation process for enabling controlled creation of gradient nanocrystalline microstructures in metals. Gradient nanostructured metals are a new class of structural materials that possess superior combination of strength and ductility, when compared to the conventional coarse-grained metals or bulk nanostructured metals. The research specifically aims to overcome major processing barriers in generating metal surfaces with controlled spatial grain-size gradients by investigating a novel deformation process that utilizes controlled propagation of surface plastic “waves”. The research will have bearing on the U.S. manufacturing industry by providing the scientific knowledge to efficiently manufacture this new class of materials with performance benefits across a wide range of critical applications, including in automotive and aerospace. Education-related impacts of the project include training of graduate students in deformation-based processing methods via internships at national labs, materials processing curriculum development to enhance undergraduate and graduate education, and development of visualization-based tools for materials manufacturing education to foster widespread interest in STEM-related fields.The project seeks to investigate two material modification processes: the ability to control subsurface strain distribution over large surfaces through repeated creation and propagation of plastic waves across the metal surface; and the ability to engineer surfaces with tunable grain size gradients and nanostructured layer thickness via control of the subsurface strain distribution. To achieve these goals, an interdisciplinary team from multiple institutions will engage in collaborative research in the following areas: (1) in-situ analysis of surface plastic flow and surface strain mapping, (2) deformation-microstructure correlations, (3) predictive modeling of surface plasticity and microstructure evolution under extreme plastic strains and strain gradients, and (4) mechanical property characterization. Taken together, these research activities will help establish a thorough scientific understanding of the process-microstructure-property relationships essential for realizing gradient nanostructured metals and metal surfaces in a scalable manner.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.

该奖项支持研究，以了解一种新型且可扩展的表面变形过程，以使金属中的梯度纳米晶微观结构受控。与常规的粗粒金属或块状纳米结构金属相比，梯度纳米结构金属是具有优质强度和延展性组合的新型结构材料。该研究专门旨在通过研究一种利用表面塑料“波”控制的新型变形过程来克服具有控制空间晶粒尺寸梯度的金属表面时的主要加工障碍。这项研究将通过提供科学知识来有效地制造这种新的材料，并在包括汽车和航空航天的各种关键应用中具有性能优势，与美国制造业有关系。该项目的与教育有关的影响包括通过国际实验室的国际船只对研究生进行基于变形的处理方法的培训，材料处理的课程开发以增强本科和研究生教育的发展，以及开发基于可视化的材料工具，用于材料制造教育的工具，以促进与较大的材料改进的范围，以促进较大的材料修改的范围。塑料波穿过金属表面；以及通过控制地下应变分布来设计具有可调晶粒尺寸梯度和纳米结构层厚度的能力。为了实现这些目标，来自多个机构的跨学科团队将在以下领域进行协作研究：（1）对表面塑料流量和表面应变映射的原位分析，（2）变形 - 微观结构相关性，（3）在极端塑性和应变梯度下的表面可变性和微观结构进化的预测建模，以及（4）机制。综上所述，这些研究活动将有助于建立对流程 - 微观结构 - 特制关系的彻底科学理解，对于以可扩展的方式实现梯度纳米结构的金属和金属表面至关重要。该奖项反映了NSF的法定任务，并被认为是通过基金会的知识分子和更广泛的影响来通过评估来珍贵的支持。