Collaborative Research: Nanostructured Alloys With Unprecedented Properties

摘要合作研究：具有空前性能的纳米结构合金henry T. Y. Yang (UCSB), Srinivasan Chandrasekar （Purdue）和W. Dale Compton (Purdue) UCSB-Purdue的合作利用了最近发现的一种大规模生产纳米结构材料的方法。该方法通过类似于机械加工的受控表面变形过程，在毫米尺度上诱导出大的塑性应变。直接制造箔、线、片等宏观尺寸的材料是可行的。这种材料的机械强度是母材的三倍。纳米结构的形成是由变形系统施加的极高应变的结果。这项合作通过两个协调的推力来利用这些发现。首先，大范围的可控变形参数将允许系统地检查影响纳米晶结构形成的参数（例如，应变，应变速率）。其次，将开发大应变变形过程中的微观结构细化模型，以评估应变、温度和材料变形的相互作用。通过整合这些推力，将通过具有成本效益的制造工艺开发新的属性组合。纳米合金在结构应用中的广泛应用已被寻求；然而，制造这些材料的成本每磅超过100美元，这限制了它们的广泛应用。该研究将为理解大应变变形过程中纳米结构细化这一重要科学现象，以及纳米结构材料在生物医学、地面交通和能源领域产品中的应用提供重要桥梁。通过与一家快速发展的先进材料公司和一家初创公司的互动，将促进向应用的过渡，这两家公司都对先进材料和微/介观系统有市场兴趣。与研究相辅相成的是一个教育项目，包括研究生的工业实习、本科生的研究实习以及与工业和国家实验室的密切互动。

AbstractCOLLABORATIVE RESEARCH: NANOSTRUCTURED ALLOYS WITH UNPRECEDENTED PROPERTIESHenry T. Y. Yang (UCSB), Srinivasan Chandrasekar (Purdue) and W. Dale Compton (Purdue) The UCSB-Purdue collaboration capitalizes on the recent discovery of a method for large-scale production of nanostructured materials. The method induces large plastic strains at the millimeter-scale by using a controlled surface deformation process analogous to machining. Direct manufacture of the materials in the form of foil, wire, and sheet of macroscopic dimensions is feasible. The materials have mechanical strength up to three times that of the parent material. The formation of the nanostructures is a consequence of the extraordinarily high strains imposed by the deformation system. The collaboration exploits these discoveries with two coordinated thrusts. First, the wide range of controllable deformation parameters will allow for systematic examination of the parameters (e.g., strain, strain rate) affecting the formation of nanocrystalline structures. Second, models will be developed for microstructure refinement during large strain deformation to assess the interactive role of strain, temperature and material transformations. By integrating these thrusts, protocols will be developed for developing novel property combinations by cost-effective manufacturing processes. Widespread use of nanostructured alloys in structural applications has been sought; however, the cost of creating these materials, quoted in excess of one hundred dollars per pound, has restricted their broad application. The research will provide an important bridge between the understanding of nanostructure refinement during large strain deformation as an important scientific phenomenon, and the utilization of nanostructured materials in products in the bio-medical, ground transportation and energy sectors. The transition to applications will be facilitated by interactions with a rapidly growing advanced materials company and a start-up, both with market interests in Advanced Materials and Micro/Meso Systems. Complementing the research is an education program featuring industrial internships for graduate students, undergraduate research internships and strong interactions with industry and National Labs.