The Effect of Temperature and Solute Content on the Deformation Mechanisms in Titanium Aluminides

温度和溶质含量对铝化钛变形机制的影响

• 批准号: 9208452
• 负责人: Hamish Fraser
• 金额: --
• 依托单位: Ohio State University Research Foundation -DO NOT USE
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-11-15 至 1996-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9208452&HistoricalAwards=false
• 关键词: Effect; Temperature; Solute; Content; Deformation

This research examines mechanisms of plastic deformation in titanium aluminide intermetallic alloys, TiAl (gamma) and Ti3Al (alpha 2), over a wide range of temperature and strain rates. Factors that influence dislocation mobilities are identified so that mechanisms that contribute to plastic flow can be determined. Two models for dislocation mobility are investigated: one looking at anisotropy of bonding charge densities and its relationship to dislocation mobility; the other at the role of non-planar dislocation core configurations on dislocation mobility. A third component of the study examines the variation in critical resolved shear stresses of various dislocations taken from a number of potential slip systems. This involves the fabrication of single crystals so that stress can be applied along specific crystallographic directions. Experimental techniques include transmission electron microscopy and high resolution electron microscopy. %%% This research adds to the fundamental knowledge concerning mechanical deformation of intermetallic alloys. It is relevant to the future development of ductile, strong intermetallic alloys for operation at high temperatures in applications such as jet engines.

本研究探讨了塑性变形的机制， 铝化钛金属间合金，TiAl（γ）和Ti 3Al （α 2），在很宽的温度和应变率范围内。 确定了影响位错迁移率的因素， 可以确定有助于塑性流动的机制。 研究了位错迁移率的两种模型： 键电荷密度的各向异性及其与 位错迁移率;其他在非平面的作用 位错核组态对位错迁移率的影响。 第三 研究的一部分检查了关键分辨率的变化， 各种位错的剪应力取自一些 潜在滑移系 这涉及到制造单一的 因此应力可以沿着特定的 晶体学方向 实验技术包括 透射电子显微镜和高分辨电子显微镜 显微镜 %%% 这项研究增加了关于 金属间合金的机械变形。 值得一 韧性强金属间合金的未来发展， 在诸如喷气发动机的应用中在高温下操作。