Anisotropic Creep and Deformation of Textured Hexagonal Close Packed Metals

9504818 Murty这是一个项目的更新，在该项目中，实验和分析程序被开发用于表征hcp金属中的晶体织构和取向分布函数。 这些技术现在被应用于hcp金属（钛、钛铝钒合金、锆和锆铌合金）的双轴蠕变行为的研究，这些金属具有不同的织构、微观结构和工作滑移系统。 此外，还探讨了从幂律蠕变到粘性蠕变的过渡机制以及织构对这些过渡的影响。 变形的特点是显微组织的研究，使用扫描透射电子显微镜和光学金相滑动痕迹分析。 重点是在各向异性双轴蠕变和双轴加载下发生的转变的晶粒形状各向异性和织构的影响。%这项研究解决了在高温下使用的金属合金的蠕变变形机制。 对这些机制的更好理解可以改善设计和组件寿命。***

9504818 Murty This is a renewal of a project in which experimental and analytical procedures were developed for characterizing crystallographic textures and orientation distribution functions in hcp metals. These techniques are now applied to a study of biaxial creep behavior in hcp metals (titanium, titanium-aluminum vanadium alloys, zirconium, and zirconium-niobium alloys) that have varied textures, microstructures and operating slip systems. In addition transitional creep mechanisms from power-law to viscous creep and related effects of texture on these transitions are explored. Deformation is characterized by microstructural studies using scanning transmission electron microscopy and optical metallography slip trace analysis. Emphasis is on the effects of grain-shape anisotropy and texture on anisotropic biaxial creep and transitions occurring under biaxial loading. %%% This research addresses creep deformation mechanisms in metal alloys used at elevated temperatures. Improved understanding of these mechanisms allows improvements in design and component lifetimes. ***