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。该项目的目的是研究与铝和铝合金在环境和高温下的大应变变形相关的动态恢复机制。该项目是纯铝和铝镁合金大应变变形的研究，是了解重要的1xxx和5xxx系列铝合金金属成形操作的基础。研究人员希望确定，对于高纯度铝，在环境温度和接近环境温度下，变形到大塑性应变（例如，4）是否会导致机械稳态。研究的第二个目的是确定新观察到的（高温）现象，几何-动态-再结晶（GDR）是否具有普遍性。美国首席研究员将从扭扭机中获益，该扭扭机设计得比劳伦斯利弗莫尔国家实验室（LLNL）的Instron 1125更适合于最终透射电子显微镜检查的样品热变形。美国首席研究员也将受益于意大利研究员在铝合金热力学现象学方面的广泛知识。该项目将使意大利首席研究员受益，允许访问高可靠的扭转测试设备（Reometrics Spectrometer II），以确定准确的应力与应变行为。

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.