Oxidation behavior of an austenitic stainless FeMnSiCrNi shape memory alloy

► After 100 h exposure, the Fe14Mn5.5Si8Cr5Ni alloy forms stratified oxide layers. ► The oxide scales are composed of outer Mn2O3, middle Mn3O4, and inner MnCr2O4. ► A ferrite layer exists beneath oxidation layer. ► The ferrite results from the transformation of oxidation-induced Mn-depleted layer. ► The thickness of ferrite layer increases with increasing oxidation time.