Fundamental Studies on Phase Stability in Intermetallic Aluminides

研究目标是根据热力学、质量传递和高温环境性质，确定金属间铝化物相稳定性的基本数据。所研究的合金体系是有或没有三元添加剂的钛铝和铌铝合金体系中的铝化物。固态原电池测量采用在600至1000摄氏度的范围内，以确定活度，活度系数，和吉布斯自由能的形成。三元化合物的添加量在5%到25%之间，包括钼、铪和钒。这项研究为这些潜在有用的合金提供了所需的热力学数据。根据铝化物体系独特的结构性能和实际意义进行选择。这些高温金属间合金在航空航天和汽车工业中具有巨大的应用潜力。* * *

9314016 Reddy The research objective is to determine fundamental data on phase stability in intermetallic aluminides, based on thermodynamic, mass transport, and high temperature environmental properties. Alloy systems to be studied are aluminides in the titanium-aluminum and niobium -aluminum alloy systems with and without ternary additions. Solid-state galvanic cell measurements are employed in the range of 600 to 1000 degrees Celsius to determine the activity, activity coefficient, and Gibbs free energy of formation. The ternary additions are in the range of 5 to 25 atom percent and include molybdenum, hafnium, and vanadium. This research develops needed thermodynamic data for these potentially useful alloys. %%% The aluminide systems are selected based on their unique structural properties and practical significance. These high temperature intermetallic alloys have significant potential for use in the aerospace and automobile industries. ***