GOALI/Collaborative Research: Engineered Surface Microstructures by Machining

该奖项由2009年美国复苏和再投资法案（公法111-5）资助。该奖项的研究目标是开发直接通过机加工加工具有特定微尺度和超细晶粒结构的工程表面的能力。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、康明斯和Seco Tools（瑞典）的互补优势，在早期观察的基础上进行合作，即加工提供了一种可控制的严重塑性变形方法，这种严重塑性变形可以用来实现微观结构的细化。研究方法将基于不同长度尺度的剧烈塑性变形的建模，包括变形区应变速率、应变和温度的交互作用所产生的微观结构和织构发展。模型将包含晶体塑性。模型预测将与使用先进光学技术直接测量的变形参数进行比较，并通过透射电子显微镜、纳米压痕和电子背散射衍射表征微观结构。如果成功，结果的更广泛影响将增强对严重塑性变形和加工中微观结构发展的科学理解，以及其在离散产品领域中的实际应用，以设计具有改进的性质和性能的部件表面。结果也将适用于广泛的一类变形过程和磨损现象。补充研究是一个教育和培训计划，包括短期学生访问工业合作伙伴和接触国际研究参与;夏季本科生研究实习;和短期课程变形微观结构现象的从业者。

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.