As cast and heat-treated alloys of the Pt-Al-V system at the Pt-rich corner

作者：Odera B O^*; Cornish L A; Shongwe M B; Rading G O; Papo M J

来源：Journal of the Southern African Institute of Mining and Metallurgy, 2012, 112(7A): 505-515.

• Phase diagram
• Pt-Al-V system
• scanning electron microscopy
• X-ray diffraction

The Pt-based alloys have a high potential for replacing some Ni-based superalloys (NBSAs) used in the highest temperature and most aggressive environments, and vanadium would be a beneficial alloying element. %26lt;br%26gt;Six alloys of average compositions Pt-26.6Al-9.1V, Pt-23.1Al-17.8V, Pt-9.6Al-21.1V, Pt-17.4Al-6.4V, Pt-22.3Al-7.9V, and Pt-6.0Al-10.1V (all in at.%) were manufactured by arc-melting and examined in the as-cast condition using scanning electron microscopy and X-ray diffraction (XRD). Five samples were heat treated at 1 000 degrees C for 1 500 hours and water quenched, then examined. The phases were identified using energy-dispersive X-ray spectroscopy and the identities were confirmed by XRD. In most of the samples, the phases existing in the as-cast condition were different from those at 1 000 degrees C after similar to 1500 hours heat treatment. A solidification projection, an isothermal section and a liquidus surface projection were determined for the Pt-rich corner.

• 出版日期2012-7