CAREER: Fundamentals of Welding Intermetallic Compounds and Alloys

小行星9702448 本CAREER研究计划使用γ TiAl作为模型材料，研究金属间化合物的自生可焊性。 本研究的主要目的是：（1）开发金属间化合物铸造和锻造合金的自熔焊工艺，确定裂纹和空洞的产生原因;（2）确定能量输入对焊缝组织和力学性能的影响（3）利用计算机模拟技术对自熔合区和热影响区的微观组织进行模拟，预测焊缝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）让斯蒂尔曼学院的少数民族本科学生参与研究活动;（3）吸引少数民族学生到亚拉巴马大学攻读研究生。 作为一类材料，金属间化合物和合金具有技术意义，因为它们重量轻，并且在高温下（超过1100 ℃）保持高强度。 一种这样的金属间化合物，γ-基铝化钛，一直特别感兴趣，因为它的性质在航空航天，结构和高温应用中表现出优异的潜在性能。 ***

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. ***