Collaborative Research: Nanostructured Alloys With Unprecedented Properties

合作研究：具有前所未有的性能的纳米结构合金杨元庆(UCSB)、斯里尼瓦桑·钱德拉塞卡(普渡)和W·戴尔·康普顿(普渡)UCSB-普渡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。该方法通过使用类似于机械加工的受控表面变形过程，在毫米尺度上产生大的塑性应变。直接制造宏观尺寸的箔、线和薄板形式的材料是可行的。这种材料的机械强度最高可达母材的三倍。纳米结构的形成是变形系统施加的超高应变的结果。该合作通过两个协调一致的推进来利用这些发现。首先，可控变形参数的广泛范围将允许系统地检查影响纳米晶结构形成的参数(例如，应变、应变率)。其次，将开发大应变变形过程中组织细化的模型，以评估应变、温度和材料转变的交互作用。通过整合这些推力，将制定协议，通过具有成本效益的制造工艺开发新的性能组合。人们一直在寻求在结构应用中广泛使用纳米结构合金；然而，制造这些材料的成本超过每磅100美元，限制了它们的广泛应用。这项研究将为理解作为一种重要科学现象的大应变变形过程中纳米结构的细化，以及纳米结构材料在生物医学、地面交通和能源部门的产品中的应用提供重要的桥梁。向应用的过渡将通过与一家快速增长的先进材料公司和一家初创公司的互动来促进，这两家公司在先进材料和微/介观系统方面都有市场兴趣。作为这项研究的补充，还有一个教育项目，以研究生的工业实习、本科生的研究实习以及与行业和国家实验室的强大互动为特色。

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.