Multifunctional Surface Engineering using Severe Plastic Deformation in Machining-Based Processes

在机械加工过程中利用严重塑性变形的多功能表面工程

• 批准号: 1233909
• 负责人: M Ravi Shankar
• 金额: $ 37万
• 依托单位: University of Pittsburgh
• 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 2016-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1233909&HistoricalAwards=false
• 关键词: Multifunctional; Surface; Engineering; using; Severe

The research objective of this award is to understand the physical principles that underlie the evolution of integral regions of refined microstructures on surfaces of bulk metallic materials in a new class of machining-based processes. This elucidation will focus on material systems that can manifest enhanced biological and mechanical properties, when grain-refined to the nanostructured state. Deformation configurations will be designed to allow for the removal of pre-set depths of material, while simultaneously endowing a freshly generated surface with extensive microstructure modification, in a single processing step. First, the process-structure interrelationships will be elucidated by measuring in situ, the thermomechanics of deformation using simultaneous high-speed image correlation and infrared thermography. Then the resulting surface microstructural consequences will be characterized using electron backscattered diffraction and X-ray diffraction. Resulting empirical data will be encapsulated in novel microstructure maps and modeled computationally. Ultimately, the process-structure-performance triad will be completed by measuring the osseointegrative response, corrosion properties and mechanical behavior.If successful, these breakthroughs can enable a practical utilization of newly-discovered functional properties of nanostructured metals, including the extensive proliferation of osteoblasts on nanograined surfaces, their enhanced electrochemical surface passivation, subdued accumulation of radiation damage, etcetera. Here, by focusing on elucidating biological and corrosion properties as a function of microstructures, a convenient manufacturing route is envisaged for endowing multifunctional surfaces on biomedical implants that can be seamlessly integrated with prevailing fabrication schema. Domestic and international collaborations with cutting tool and discrete product manufacturers, as well as with the University of Pittsburgh Medical Center will be leveraged to support the research thrusts and to initiate new outreach initiatives. This award will also support the development of new research-integrated undergraduate/graduate educational initiatives and enhancing participation of underrepresented groups.

该奖项的研究目标是了解在新型加工工艺中大块金属材料表面精细微结构整体区域演变的物理原理。这一阐明将集中于当晶粒细化至纳米结构状态时可以表现出增强的生物和机械性能的材料系统。变形配置的设计将允许去除预设深度的材料，同时在单个处理步骤中赋予新生成的表面广泛的微观结构修改。首先，将通过使用同步高速图像相关和红外热成像技术现场测量变形热力学来阐明过程-结构之间的相互关系。然后，将使用电子背散射衍射和 X 射线衍射来表征所得的表面微观结构结果。由此产生的经验数据将被封装在新颖的微观结构图中并进行计算建模。最终，过程-结构-性能三元组将通过测量骨整合响应、腐蚀特性和机械行为来完成。如果成功，这些突破可以实现纳米结构金属新发现的功能特性的实际利用，包括成骨细胞在纳米颗粒表面的广泛增殖、其增强的电化学表面钝化、抑制 辐射损伤的累积等。在这里，通过重点阐明作为微结构函数的生物和腐蚀特性，设想了一种方便的制造路线，用于在生物医学植入物上赋予多功能表面，该表面可以与流行的制造方案无缝集成。将利用与切削刀具和离散产品制造商以及匹兹堡大学医学中心的国内和国际合作来支持研究重点并启动新的推广计划。该奖项还将支持新的研究一体化本科生/研究生教育计划的发展，并加强代表性不足群体的参与。