High-temperature oxidation behaviour of AlxFeCrCoNi and AlTiVCr compositionally complex alloys
Artikel i vetenskaplig tidskrift, 2020

Compositionally complex alloys (CCAs), also termed as high entropy alloys (HEAs) or multi-principal element alloys (MPEAs), are being considered as a potential solution for many energy-related applications comprising extreme environments and temperatures. Herein, a review of the pertinent literature is performed in conjunction with original works characterising the oxidation behaviour of two diverse Al-containing alloys; namely a lightweight (5.06 g/cm(3)) single-phase AlTiVCr CCA and a multiple-phase Al0.9FeCrCoNi CCA (6.9 g/cm(3)). The thermogravimetric results obtained during oxidation of the alloys at 700 and 900 degrees C revealed that both alloys tended to obey the desired parabolic rate law. Post-exposure analysis by means of electron microscopy indicated that while the oxide scale formed on the AlTiVCr is adherent to the substrate, the scale developed on the Al0.9FeCrCoNi displays a notable spalling propensity. This study highlights the need for tailoring the protective properties of the oxide scale formed on the surface of the CCAs.

Författare

Mohsen Esmaily

Massachusetts Institute of Technology (MIT)

Monash University

Yao Qiu

Monash University

Sedigheh Bigdeli

Chalmers, Kemi och kemiteknik, Energi och material, Oorganisk miljökemi

Mahesh B. Venkataraman

Australian National University

Antoine Allanore

Massachusetts Institute of Technology (MIT)

Nick Birbilis

Australian National University

NPJ MATERIALS DEGRADATION

2397-2106 (eISSN)

Vol. 4 1 25

Ämneskategorier

Materialkemi

Metallurgi och metalliska material

Korrosionsteknik

DOI

10.1038/s41529-020-00129-2

Mer information

Senast uppdaterat

2020-09-24