CAREER: Fundamentals of Welding Intermetallic Compounds and Alloys

职业：金属间化合物和合金焊接基础知识

• 批准号: 9702448
• 负责人: Viola Acoff
• 金额: $ 29.83万
• 依托单位: University of Alabama Tuscaloosa
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-06-01 至 2002-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9702448&HistoricalAwards=false
• 关键词: CAREER; Fundamentals; Welding; Intermetallic; Compounds

9702448 Acoff This CAREER research plan addresses the autogenous weldability of intermetallic compounds using gamma TiAl as the model material. Objectives of the research are: (1) Development of fusion welding processes for cast and wrought alloys of intermetallic compounds using autogenous welding, identifying the causes of cracks and voids; (2) Determination of the effects of energy input on the weld microstructure and the mechanical properties (hardness, fracture toughness, tensile properties); (3) Simulation of the autogenous fusion zone and heat-affected zone microstructures using computer modeling to predict weld and heat-affected zone microstructures and properties. The educational plan of this project complements the research plan outlined above. Objectives of the proposed educational plan are: (1) Enhance the undergraduate materials curriculum with increased computer simulation and modeling; (2) Involve undergraduate minority students from Stillman College in research activities; and (3) Attract minority students to graduate study at the University of Alabama. %%% As a class of materials, intermetallic compounds and alloys are of technological interest because they are lightweight and maintain high strengths at elevated temperatures (over 1100 C). One such intermetallic compound, gamma-based titanium aluminide, has been of particular interest because its properties demonstrate excellent potential performance in aerospace, structural, and high temperature applications. ***

9702448 Acoff这项职业研究计划以伽马TiAl为模型材料，研究金属间化合物的自焊性。研究的目标是：(1)利用自焊开发金属间化合物铸态和变形合金的熔焊工艺，找出裂纹和空洞的原因；(2)确定能量输入对焊缝组织和力学性能(硬度、断裂韧性、拉伸性能)的影响；(3)使用计算机建模模拟自熔区和热影响区的组织结构，以预测焊接和热影响区的组织和性能。该项目的教育计划是对上述研究计划的补充。拟议教育计划的目标是：(1)通过增加计算机模拟和建模来加强本科材料课程；(2)让斯蒂尔曼学院的本科少数民族学生参与研究活动；以及(3)吸引少数民族学生到阿拉巴马大学攻读研究生学位。金属间化合物和合金作为一类材料，由于它们重量轻，在高温(超过1100摄氏度)下仍保持高强度，因此引起了技术上的兴趣。其中一种金属间化合物，伽马基钛铝化物，由于其在航空航天、结构和高温应用方面表现出优异的潜在性能而引起了人们的特别兴趣。***