Effect of Alloying and Thermo-Mechanical-Treatment on Anisotropic Creep and Deformation of Ti-alloys

合金化和形变热处理对钛合金各向异性蠕变和变形的影响

• 批准号: 0101309
• 负责人: K. Linga Murty
• 金额: $ 36.23万
• 依托单位: North Carolina State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-09-01 至 2006-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0101309&HistoricalAwards=false
• 关键词: Effect; Alloying; Thermo; Mechanical; Treatment

This project addresses the influence of thermo-mechanical-treatment (TMT) and alloying on deformation and creep anisotropy of titanium alloys. The research involves characterization of anisotropic biaxial creep of Ti alloys using closed-end internally pressurized thin-walled tubing superimposed with an axial load. The approach is to investigate these behaviors in Ti and Ti- 3Al-2.5V following stress-relief anneal and complete recrystallization. Alloying additions such as Al to Ti result in significant modification of crystallographic texture and operating slip systems. Cold-working leads to grain-shape anisotropy of the otherwise equiaxed grain structure of Rx materials. The effects of these variables on deformation microstructures are to be investigated along with deformation anisotropy following biaxial loading under varied stress-states and stress-levels. Transitions in creep mechanisms and the effect of underlying deformation mechanism(s) on creep anisotropy will also be addressed. Such studies are important for realistic estimates of creep strains and life of these structural materials in service.%%% The project addresses basic research issues in a contemporary topical area of materials science with technological relevance in aerospace, automobile, and chemical sectors where Ti-alloys are used in tube form. An important feature of the program is the integration of research and education through the training of students in a fundamentally and technologically significant area. The project is expected to provide unique opportunities for graduate and undergraduate students to develop strong technical, communication, and organizational/management skills through experiences in a forefront research environment. ***

本计画探讨热机械处理及合金化对钛合金变形及蠕变各向异性之影响。本研究主要是利用两端封闭的内压薄壁管外加轴向载荷来表征钛合金的各向异性双轴蠕变。该方法是研究这些行为在Ti和Ti- 3Al-2.5V后的应力消除退火和完全再结晶。合金添加剂，如铝到钛的晶体结构和操作滑移系统的显着修改的结果。冷加工导致Rx材料的等轴晶粒结构的晶粒形状各向异性。这些变量对变形微观结构的影响将沿着在不同应力状态和应力水平下双轴加载后的变形各向异性进行研究。蠕变机制的转变和潜在的变形机制对蠕变各向异性的影响也将得到解决。这些研究对于实际估算这些结构材料的蠕变应变和使用寿命非常重要。该项目解决了材料科学当代热门领域的基础研究问题，与航空航天，汽车和化学领域的技术相关性，其中钛合金以管状形式使用。该计划的一个重要特点是通过在一个基本和技术上重要的领域对学生进行培训来整合研究和教育。该项目预计将为研究生和本科生提供独特的机会，通过在前沿研究环境中的经验，培养强大的技术，沟通和组织/管理技能。***