Processing of Functionally Graded Nanocrystalline Alloys

功能梯度纳米晶合金的加工

• 批准号: 0620304
• 负责人: Christopher Schuh
• 金额: $ 31.33万
• 依托单位: Massachusetts Institute of Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-09-01 至 2009-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0620304&HistoricalAwards=false
• 关键词: Processing; Functionally; Graded; Nanocrystalline; Alloys

This project involves both research and educational elements in the area of advanced materials processing, with the specific goal of creating a new class of materials: functionally graded nanocrystalline metals (FGNMs). In terms of intellectual merits, the program addresses new processing science issues that arise in combining two previously separate subfieldsnanocrystalline metals and functionally graded materials. Nanocrystalline alloys are prepared using aqueous electrodeposition, and graded structures induced through in-situ changes to the applied current waveform. The fundamental processing science centers around the mismatch of composition, structure, and properties between the adjacent layers in a graded nanocrystalline structure, and the way in which processing variables can be tailored to control these mismatches; residual stresses and interface structure are specifically studied as a function of such mismatches. The research is structured in such a way that processing questions are addressed in order of complexity, first for individual deposited layers, then bi-layers, and finally complex multi-layer gradient structures.In addition to training of graduate and undergraduate students in new areas of materials processing science, the broader impacts of the project center on the integration of research and teaching. These activities take advantage of the PI's teaching involvement with a course on Advanced Materials Processing" each spring. Undergraduates enrolled in the course participate in a unique project that engages them in the research activity, and culminates with a written report that ties the research to the mission of the course. This mechanism also facilitates the introduction of new lectures on nanocrystalline metals processing into the course.

该项目涉及先进材料加工领域的研究和教育元素，具体目标是创造一种新的材料类别：功能梯度纳米晶体金属(FGNM)。在知识优势方面，该计划解决了在将两个以前分开的子领域--非晶体金属和功能梯度材料--结合起来时出现的新的加工科学问题。用水溶液电沉积法制备纳米晶合金，并通过改变施加电流的波形原位诱导出梯度结构。基本的加工科学围绕着梯度纳米晶体结构中相邻层之间的成分、结构和性能的失配，以及可以定制工艺变量来控制这些失配的方式；作为这种失配的函数，具体研究了残余应力和界面结构。该研究的结构是按照处理问题的复杂性顺序进行的，首先是单个沉积层，然后是双层，最后是复杂的多层梯度结构。除了培养研究生和本科生在材料加工科学的新领域，该项目的更广泛的影响集中在研究和教学的整合上。这些活动利用了PI在每年春季开设的先进材料加工课程的教学参与。注册该课程的本科生参与一个独特的项目，让他们参与研究活动，最后以书面报告将研究与课程的使命联系起来。这种机制还有助于在课程中引入关于纳米金属加工的新讲座。