Fundamental Studies on Phase Stability in Intermetallic Aluminides

9314016 Reddy研究目标是根据热力学、传质和高温环境性质，确定金属间铝化物相稳定性的基本数据。被研究的合金系统是钛-铝和Nb-铝合金系统中的铝化物，有和没有三元添加。在600到1000摄氏度的范围内使用固态原电池测量来确定活度、活度系数和生成吉布斯自由能。三元加入物的原子百分比范围为5%至25%，包括钼、氢和钒。这项研究为这些潜在有用的合金开发了所需的热力学数据。%铝化物系统是根据其独特的结构特性和实际意义而选择的。这些高温金属间化合物合金在航空航天和汽车工业中具有巨大的潜力。***

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. ***