CAREER: Fundamentals of Welding Intermetallic Compounds and Alloys

本CAREER研究计划以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)利用自焊技术开发金属间化合物铸造和变形合金的熔焊工艺，确定裂纹和空洞的原因；(2)确定能量输入对焊缝显微组织和力学性能（硬度、断裂韧性、拉伸性能）的影响；(3)利用计算机模拟自熔区和热影响区组织，预测焊缝和热影响区组织和性能。本项目的教学计划是对上述研究计划的补充。提出的教育计划的目标是：(1)通过增加计算机模拟和建模来加强本科材料课程；(2)让斯蒂尔曼学院少数民族本科生参与研究活动；(3)吸引少数民族学生到阿拉巴马大学读研究生。作为一类材料，金属间化合物和合金在技术上很受关注，因为它们重量轻，在高温下（超过1100摄氏度）仍能保持高强度。其中一种金属间化合物，基于γ的钛铝化物，由于其性能在航空航天，结构和高温应用中表现出优异的潜在性能而受到特别关注。＊＊＊

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. ***