GOALI/Collaborative Research: Engineered Surface Microstructures by Machining

该奖项是根据2009年美国复苏和再投资法案（公法111-5）资助的。这项学术与工业合作研究奖的研究目标是开发具有特定微尺度和超细颗粒结构的工程表面的能力，并直接通过加工增强机械性能。它汇集了普渡大学、加州大学圣巴巴拉分校、匹兹堡大学、M4科学公司、康明斯公司和瑞典赛科工具公司的互补优势，在早期观察的基础上进行合作，发现加工提供了一种控制严重塑性变形的方法，这种严重塑性变形可以用来影响微观结构的细化。研究方法将基于不同长度尺度下的严重塑性变形的建模，包括变形区中应变速率、应变和温度的相互作用所产生的微观组织和织构发展。这些模型将考虑晶体的可塑性。模型预测将与使用先进光学技术直接测量的变形参数，以及通过透射电子显微镜、纳米压痕和电子背散射衍射表征的微观结构进行比较。如果成功，研究结果的广泛影响将增强对机械加工中严重塑性变形和微观结构发展的科学理解，并将其在离散产品领域的实际应用用于设计具有改进性能和性能的部件表面。结果也将适用于广泛的变形过程和磨损现象。与研究相辅相成的是一个教育和培训项目，包括学生短期访问工业合作伙伴和参与国际研究；暑期本科生科研实习；并为从业人员开设了变形微结构现象的短期课程。

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).The research objective of this Grant Opportunity for Academic Liaison with Industry (GOALI) Collaborative Research award is to develop capabilities for engineering surfaces with specific micro-scale and ultrafine grained structures, and enhanced mechanical properties, directly by machining. It brings together the complementary strengths of Purdue, the University of California Santa Barbara, University of Pittsburgh, M4 Sciences, Cummins and Seco Tools (Sweden) in a collaboration building on early observations that machining offers a controlled method of severe plastic deformation and that this severe plastic deformation can be exploited to effect microstructure refinement. The research approach will be based on modeling of the severe plastic deformation at different length scales, including microstructure and texture development arising from interactive effects of strain rate, strain and temperature in the deformation zone. The models will incorporate crystal plasticity. Model predictions will be compared with direct measurement of the deformation parameters made using advanced optical techniques, and characterization of microstructure by transmission electron microscopy, nano-indentation and electron back scatter diffraction.If successful, the broader impact of the results will be enhanced scientific understanding of severe plastic deformation and microstructure development in machining, and its practical utilization in the discrete products sector to engineer component surfaces with improved properties and performance. The results will be applicable also to a broad class of deformation processes and wear phenomena. Complementing the research is an education and training program that includes short-term student visits to industrial partners and exposure to international research participation; summer undergraduate research internships; and a short-course on deformation-microstructure phenomena for practitioners.