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- Title
High Temperature Oxidation Study of Nano-Y<sub>2</sub>O<sub>3</sub> Dispersed Ferritic Alloys Synthesized by Mechanical Alloying and Sintering.
- Authors
Meharwal, A.; Kumar, M.; Karak, S. K.; Majumdar, J. Dutta; Manna, I.
- Abstract
This study concerns mechanism and kinetics of isothermal oxidation of four Fe-Cr-Al-Ti ferritic alloys in the range 700 °C to 900 °C for up to 50 hours in air. These four alloys with nominal compositions of 83.0Fe-13.5Cr-2.0Al-0.5Ti (alloy A), 79.0Fe-17.5Cr-2.0Al-0.5Ti (alloy B), 75.0Fe-21.5Cr-2.0Al-0.5Ti (alloy C), and 71.0Fe-25.5Cr-2.0Al-0.5Ti (alloy D) each with 1.0 wt pct nano-Y2O3 dispersion were synthesized by mechanical alloying and sintering at 1000 °C by hot isostatic pressing, high pressure sintering, hydrostatic extrusion and pulse plasma sintering techniques. A detailed characterization of the phase aggregate, microstructure and micro-composition of the oxide scale was carried out by X-ray diffraction, scanning electron microscopy and energy dispersive spectroscopy, respectively. Oxidation kinetics appear to follow a parabolic rate with an activation energy of 135 to 234 kJ/mol, which depend on alloy composition (i.e., Cr content). Oxidation mostly occurred by counter-ionic diffusion of oxygen from air to the interior and cations (Cr+3 or Fe+3) from the bulk toward the surface. Alloy D sintered by hot isostatic pressing offered the highest resistance to oxidation.
- Subjects
MECHANICAL alloying; ISOSTATIC pressing; HIGH temperatures; SINTERING; HOT pressing; OXIDATION kinetics
- Publication
Metallurgical & Materials Transactions. Part A, 2020, Vol 51, Issue 10, p5257
- ISSN
1073-5623
- Publication type
Article
- DOI
10.1007/s11661-020-05918-7