Work

High-temperature oxidation resistance of sputtered (Al,Cr,Nb,Ta,Ti,Si)N coatings

Year: 2024

Type: article

Abstract: High-entropy metal-sublattice (Al,Cr,Nb,Ta,Ti)N coatings, with up to 15.0 at% additional Si content were developed and investigated for their oxidation resistance by exposing them for 3, 30, and 100 h to ambient air at 900, 950, and 1000 ∘ C. The Si-free coating is rapidly oxidized, but all of the Si-alloyed coatings survive even the harshest oxidation test. The oxides crystallize mostly in the rutile structure with some Ta 2 O 5 -type phase fractions at higher Si contents. Detailed TEM investigations reveal a varied microstructure across the oxide scales with a succession of Cr-, Al, and Ti-rich top oxide layers , which agrees with a reported thermodynamical calculation of oxide stabilities.

Source: Journal of Alloys and Compounds

DOI: 10.1016/j.jallcom.2024.176912

Authors: Andreas Kretschmer, Paul Heinz Mayrhofer

Institution: TU Wien

Language: English

Topic: High Entropy Alloys Studies

Subfield: Mechanical Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $3,550

Funders: Technische Universität Wien, Österreichische Forschungsförderungsgesellschaft, Technische Universität Wien Bibliothek