|About this Abstract
||Materials Science & Technology 2011
||Advanced Protective Coatings for Refractory Metals and Alloys
||Low Temperature Oxidation Behavior of Niobium Alloys
||Rabindra Mahapatra, M. A. Imam, S. K. Varma, C. E. Feng, C. E. Lei
|On-Site Speaker (Planned)
The isothermal-oxidation behavior of 40Nb-20Mo-15Si-25Cr and 35Nb-20Mo-15Si-25Cr-5B (in at.%) refractory alloys was investigated to a period of 312 hours in air at 700 and 900 C. The purpose of this investigation is to examine the low temperature oxidation (pesting) behavior of these alloys. Our results indicate that when these alloys are exposed to 700 and 900 C in air for 312 hours, the metallic specimens transformed to powders (pesting) at 700 C and morphology of oxides changed to flakes at 900 C. The oxidation behavior of these alloys when hipped at 1300 C for 2hr at 30 ksi also showed similar behavior when tested under the same conditions. Optical and scanning-electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and X-ray diffraction (XRD) techniques were used to study the microstructure and morphology of the oxides. The results of oxidation behavior and microstructural investigation will be presented.
||Definite: A CD-only volume