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BIBTEX RIS

Anomalous cyclic oxidation behaviour of a Fe–Mn–Si–Cr–Ni shape memory alloy

2017; Elsevier BV; Volume: 119; Linguagem: Inglês

10.1016/j.corsci.2017.02.026

1879-0496

Artur Mariano de Sousa Malafaia, Marcelo Falção de Oliveira,

High Entropy Alloys Studies

Fe–Mn–Si–Cr–Ni alloys are known by their shape memory properties, however, oxidation studies are still incipient. This study evaluated an Fe-17Mn-5Si-10Cr-4Ni-VC alloy on cyclic oxidation tests at 800, 900 and 1000 °C. Mass variation was evaluated and oxide layers were examined by SEM, EDS and XRD. An anomalous mass variation was observed: after initial spallation, the material restarted mass gain. The formed Mn-depleted zone changed the austenite microstructure to ferrite on the metal/oxide interface and better oxide anchoring was promoted through the roughness generated. The result makes this alloy an interesting candidate for applications where cyclic oxidation is an important issue.