Anisotropic Creep and Deformation of Textured HCP Metals

研究了六边形紧密堆积金属和合金的双轴蠕变行为，这些金属和合金具有不同的织构、微观结构和操作滑移系统。研究了从幂律蠕变到黏性蠕变的过渡机理以及织构对这种过渡的影响。研究中选择了几种金属和合金，以提供具有截然不同纹理的材料。显微结构研究是用扫描透射电子显微镜来确定位错结构和光学金相学来帮助滑移迹分析完成的。这项研究被认为对金属合金的高温使用和更好地理解它们在双轴应力下的行为有价值。六方密装金属被用于航空航天和能源工业，它们暴露在高温和复杂的载荷条件下。在这些条件下，对蠕变的更好理解将导致利用织构硬化和预测各向异性变形的技术。

Biaxial creep behavior is studied in hexagonal close packed metals and alloys that have been processed with varied textures, microstructures, and operating slip systems. Investigations on the transitional creep mechanisms from power law to viscous creep and the effects of texture on these transitions are being examined. Several metals and alloys have been selected for the studies to provide materials with vastly different textures. Microstructural studies are accomplished using scanning transmission electron microscopy to determine dislocation structures and optical metallography to aid in slip trace analysis. %%% The research is seen as valuable to the high temperature use of metal alloys and for better understanding of their behavior under biaxial stresses. Hexagonal close packed metals are used in aerospace and energy industries where they are exposed to high temperatures and complex loading conditions. Improved understanding of creep under these conditions should lead to techniques to take advantage of textural hardening and to predict anisotropic deformation.