[T14] High Temperature Materials

[15F-T14-08] Mechanical Properties and Characterization of Low Density Co-Based Superalloys for High Temperature Applications

J. C. del Castillo¹, A. Mejía Reinoso¹, *J. M. Torralba^{1, 2}, M. Campos¹ (1.Universidad Carlos III Madrid, Spain, 2.IMDEA Materials Institute, Spain)

キーワード：Co based superalloys, mechanical properties, Thermodynamic properties , structural stability

High-temperature applications require materials that balance stiffness, strength, ductility, and corrosion resistance. Traditionally, Ni-based superalloys have been used to fulfill this role since they are the most suitable. A new research window opened up when a stable reinforcement phase was discovered in a Co-Al-W system. The present research aimed to lower density while increasing working temperatures. To achieve this, spark plasma sintering (SPS) was used to manufacture three low-density Co-based superalloys, which were then homogenized and aged to improve the partition of the elements. Microstructure was characterized to understand the mechanical behavior tested by hardness and by compression tests, carried out at different temperatures. The results are in good agreement with simulations performed with Thermo-calc software, and a mathematical model is proposed to analyze the yield behavior under compression as a function of temperature.