The Effect of Oxygen Partial Pressure on Microstructure and Properties of Fe40Al Alloy Sintered under Vacuum

Materials

Dariusz Siemiaszko¹  Beata Kowalska¹  Paweł Jóźwik¹  Monika Kwiatkowska¹ 

关键词: iron aluminides;    phase identification;    oxides;    vacuum;    reaction synthesis;   

DOI  :  10.3390/ma8041513

来源: mdpi

【 摘 要 】

This paper presents the results of studies on the influence of oxygen partial pressure (vacuum level in the chamber) on the properties of FeAl intermetallics. One of the problems in the application of classical methods of prepared Fe-Al intermetallic is the occurrence of oxides. Applying a vacuum during sintering should reduce this effect. In order to analyze the effect of oxygen partial pressure on sample properties, five samples were processed (by a pressure-assisted induction sintering—PAIS method) under the following pressures: 3, 8, 30, 80, and 300 mbar (corresponding to oxygen partial pressures of 0.63, 1.68, 6.3, 16.8, and 63 mbar, respectively). The chemical and phase composition, hardness, density, and microstructure observations indicate that applying a vacuum significantly impacts intermetallic samples. The compact sintered at pressure 3 mbar is characterized by the most homogeneous microstructure, the highest density, high hardness, and nearly homogeneous chemical composition.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.