GOALI: Engineering of Functionality Graded Magnesium Composite Surfaces

目标：功能梯度镁复合材料表面工程

• 批准号: 1234961
• 负责人: Srinivasan Chandrasekar
• 金额: $ 36.01万
• 依托单位: Purdue University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-09-01 至 2017-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1234961&HistoricalAwards=false
• 关键词: GOALI; Engineering; Functionality; Graded; Magnesium

The objective of this Grant Opportunity for Academic Liaison with Industry (GOALI) award is to develop the processing science for mechanical surface generation so as to enable engineering of magnesium alloy/composite surfaces with specific microstructures that enhance wear performance. The approach involves analysis of mechanics of large strain deformation underlying the unit interaction fundamental to mechanical surface generation - sliding tool interacting with a workpiece surface. Large strain deformation on the workpiece surface will be characterized, in situ, as a function of controllable process variables using advanced experimental mechanics techniques. Microstructure and properties of the surface will be analyzed at multiple length scales using electron microscopy, micro-tensile test, and micro/nano tribology methods, resulting in deformation-microstructure-property maps. Finite element analysis incorporating grain-level plasticity will be used to predict and optimize the deformation in order to create graded surface microstructures with desirable properties. A predictive framework will be established to engineer wear resistant surfaces by control of process variables. Surface generation processes of wide-ranging interest to the discrete products sector including burnishing, surface mechanical attrition, microfinishing, wear and friction stir processing will be impacted by this work. The scientific benefits will be enhanced understanding of deformation phenomena in hexagonal close packed metals and deformation-microstructure-property correlations for structural magnesium alloys. The technological benefits will be new or improved processes for creating magnesium alloy surfaces with novel attributes enabling development of ultra-lightweight powertrain and structural sub-systems for transportation. Broader impacts include improved fuel economy in automotive, aerospace, or other transportation systems and concomitant environmental benefits; and a strong educational component that will contribute towards a workforce competent in advanced processes and structural materials for industrial applications. The education and training program also includes graduate student internships in industry, undergraduate research training for physically challenged students via collaboration with the National Technical Institute for the Deaf, Rochester Institute of Technology, and a modest focus on fostering entrepreneurship in graduate study.

该奖项的目的是发展机械表面生成的加工科学，以便能够对具有特定微观结构的镁合金/复合材料表面进行工程设计，从而提高磨损性能。该方法涉及分析的大应变变形力学的单位相互作用的基本机械表面生成-滑动工具与工件表面的相互作用。在工件表面的大应变变形的特点是，在现场，作为一个可控的过程变量的函数，使用先进的实验力学技术。 将使用电子显微镜、微拉伸试验和微/纳米摩擦学方法在多个长度尺度上分析表面的微观结构和性能，从而得到变形-微观结构-性能图。结合晶粒级塑性的有限元分析将用于预测和优化变形，以创建具有理想性能的梯度表面微观结构。将建立一个预测框架，通过控制工艺变量来设计耐磨表面。这项工作将影响离散产品部门广泛关注的表面生成过程，包括抛光，表面机械磨损，微加工，磨损和摩擦搅拌处理。研究成果将有助于加深对密排六方晶系金属变形现象的理解，以及对结构镁合金变形-组织-性能关系的研究。技术优势将是新的或改进的工艺，用于创建具有新属性的镁合金表面，从而能够开发用于运输的超轻型动力系统和结构子系统。更广泛的影响包括提高汽车，航空航天或其他运输系统的燃油经济性以及随之而来的环境效益;以及强大的教育成分，这将有助于培养能够胜任工业应用的先进工艺和结构材料的劳动力。教育和培训计划还包括研究生在行业实习，通过与国家聋人技术研究所，罗切斯特理工学院合作，为身体残疾的学生提供本科研究培训，并适度关注研究生学习中的创业精神。