U.S.-Italy Cooperative Research: Dynamic Restoration Mechanisms in Aluminum and Aluminum Magnesium Alloys Deformed to Large Plastic Strains

该奖项将支持俄勒冈州立大学的M.E.Kassner教授和意大利安科纳大学的E.Evangelista教授之间的合作研究。该项目的目标是研究铝和铝合金在常温和高温下的大应变变形的动态恢复机制。该项目是对纯铝和铝镁合金大应变变形的研究，为了解重要的1xxx和5xxx系列铝合金的金属成形操作奠定了基础。研究人员希望确定，对于在常温和近常温下的高纯铝，变形到大的塑性应变(例如4)是否会导致机械稳定状态。研究的第二个目标是确定新观察到的(高温)现象--几何动态再结晶(GDR)是否具有普遍性。与劳伦斯利弗莫尔国家实验室(LLNL)Instron 1125相比，美国首席研究员将大大受益于获得扭转机，该扭转机设计为比劳伦斯利弗莫尔国家实验室(LLNL)Instron 1125更适合于最终进行透射电子显微镜检查的样品的热变形。美国首席研究员还将受益于意大利研究员在铝合金热机械现象方面的广博知识。该项目将使意大利首席研究员受益，因为它允许获得高度可靠的扭转测试设备(Reometrics光谱仪II)，以确定准确的应力应变行为。

This award will support collaborative research between Professor M.E. Kassner of Oregon State University and Professor E. Evangelista of the University of Ancona, Italy. The objective of the project is to investigate the dynamic restoration mechanisms associated with large strain deformation of aluminum and aluminum alloys at ambient and elevated temperatures. The project is a study of large strain deformation of pure aluminum and aluminum- magnesium alloys, a fundamental basis for understanding metal- forming operations with the important 1xxx and 5xxx series aluminum alloys. The investigators hope to determine whether, for high purity aluminum at ambient and near-ambient temperatures, deformation to large plastic strains (e.g., 4) will result in a mechanical steady state. The second objective of the research is to determine whether the newly observed (elevated temperature) phenomenon, geometric-dynamic-recrystallization (GDR) is general. The US principal investigator will substantially benefit from access to a torsion machine that is designed to be more suitable for hot deformation of specimens for eventual transmission electron microscopy examination than the Lawrence Livermore National Laboratory (LLNL) Instron 1125. The US principal investigator will also benefit from the Italian investigator's breadth of knowledge of the thermal-mechanical phenomenology of aluminum alloys. This project will benefit the Italian principal investigator by allowing access to highly reliable torsion testing equipment (Reometrics Spectrometer II) for the purpose of determining accurate stress versus strain behavior.