Anisotropic Creep and Deformation of Textured HCP Metals

研究了经不同织构、显微组织和滑移制度处理的六方密排金属和合金的双向蠕变行为。目前正在研究从幂定律蠕变到粘性蠕变的转变机制以及织构对这些转变的影响。选择了几种金属和合金进行研究，以提供具有截然不同的质地的材料。显微组织研究使用扫描电子显微镜来确定位错结构，光学金相技术来辅助滑移轨迹分析。这项研究对金属合金的高温使用和更好地了解其在双轴应力下的行为具有重要价值。六角形密排金属用于航空航天和能源行业，在这些行业中，它们暴露在高温和复杂的加载条件下。更好地了解这些条件下的蠕变应该会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.