Study of Deformation Bands and their Role in Microstructural Evolution

9814768 Starke本研究的目的是通过对规则变形带的实验分析来推进微观结构连续体建模。 研究结果可用于变形构造的模拟。 一个目标是一个简单的预测理论的条件下的变形带的启动，增长和随后的影响的力学行为和微观结构的演变。 一个主要的输出应该是宏观代码所需的计算机模拟不断变化的变形微观结构和纹理在热机械加工。 与变形带形成有关的变量包括金属合金、滑移模式、晶粒尺寸、温度、应变和应变速率。 所选合金为铝-铜二元合金、铝-镁二元合金和铝-铜-硅三元合金。 这些被选择以提供滑移行为和沉淀结构的变化。%这些代码应影响金属合金加工图的开发，从而降低合金开发成本和应用时间。 更好地了解铝合金将影响其在新一代运输车辆中的应用。

9814768Starke The objective of this research is to advance microstructural continuum modeling through an experimental analysis of regular deformation bands. The results are used in modeling of deformation structures. A goal is a simple predictive theory for the conditions of deformation band initiation, growth and subsequent effect on mechanical behavior and microstructural evolution. A primary output should be macroscopic codes required in computer simulations of evolving deformation microstructures and textures during thermomechanical processing. Variables related to deformation band formation that are examined include the metal alloys, slip mode, grain size, temperature, strain and strain rate. The alloys selected for the study are an aluminum-copper binary, an aluminum-magnesium binary and an aluminum-copper-silicon ternary. These are selected to provide variation in slip behavior and precipitate structure.%%%These codes should impact the development of processing maps of metallic alloys thereby reducing alloy development costs and application times. Better understanding of aluminum alloys will impact their application to the new generation of transportation vehicles.***