000893738 001__ 893738 000893738 005__ 20240708132701.0 000893738 0247_ $$2doi$$a10.1016/j.actamat.2021.117025 000893738 0247_ $$2ISSN$$a1359-6454 000893738 0247_ $$2ISSN$$a1873-2453 000893738 0247_ $$2Handle$$a2128/28032 000893738 0247_ $$2altmetric$$aaltmetric:106869696 000893738 0247_ $$2WOS$$aWOS:000684229400014 000893738 037__ $$aFZJ-2021-02793 000893738 082__ $$a670 000893738 1001_ $$0P:(DE-Juel1)176279$$aBadie, Sylvain$$b0$$eCorresponding author 000893738 245__ $$aMechanism for breakaway oxidation of the Ti2AlC MAX phase1 000893738 260__ $$aAmsterdam [u.a.]$$bElsevier Science$$c2021 000893738 3367_ $$2DRIVER$$aarticle 000893738 3367_ $$2DataCite$$aOutput Types/Journal article 000893738 3367_ $$0PUB:(DE-HGF)16$$2PUB:(DE-HGF)$$aJournal Article$$bjournal$$mjournal$$s1625651254_26955 000893738 3367_ $$2BibTeX$$aARTICLE 000893738 3367_ $$2ORCID$$aJOURNAL_ARTICLE 000893738 3367_ $$00$$2EndNote$$aJournal Article 000893738 520__ $$aThe good oxidation resistance of MAX phases up to temperatures around 1200 °C can be compromised for long exposure due to the breakaway of the protective alumina layer. Herein, we unveil a mechanism of breakaway oxidation of the Ti2AlC MAX phase, identifying the main trigger and the solutions to avoid it. It is caused by excessive rumpling of the oxide scale on surfaces with arithmetical mean roughness (Ra) > 3 µm and constitutes a key factor in subsequent consumption of Ti2AlC. First, the oxide scale experienced rumpling due to significant radial stresses generated at the Ti2AlC/oxide interface. Second, scale blistering resulted from substantial buckling due to the evolution of in-plane stresses and lateral lengthening. Third, blister collapse and exposure of the underlying Al-depleted Ti2AlC surface led to rapid ingress of oxygen and oxide/substrate interface recession. The self-healing ability of Ti2AlC has been restrained and breakaway oxidation kinetics following a linear trend have been initiated. Similarly, breakaway oxidation was observed on micro-damaged surfaces. A mixed oxide layer with high porosity mainly composed of rutile titanium dioxide (TiO2) promptly formed on these surfaces, gradually consuming the base Ti2AlC material. 000893738 536__ $$0G:(DE-HGF)POF4-1241$$a1241 - Gas turbines (POF4-124)$$cPOF4-124$$fPOF IV$$x0 000893738 588__ $$aDataset connected to CrossRef, Journals: juser.fz-juelich.de 000893738 7001_ $$0P:(DE-Juel1)129662$$aSebold, Doris$$b1 000893738 7001_ $$0P:(DE-Juel1)129670$$aVaßen, Robert$$b2$$ufzj 000893738 7001_ $$0P:(DE-Juel1)161591$$aGuillon, Olivier$$b3$$ufzj 000893738 7001_ $$0P:(DE-Juel1)162271$$aGonzalez-Julian, Jesus$$b4$$ufzj 000893738 773__ $$0PERI:(DE-600)2014621-8$$a10.1016/j.actamat.2021.117025$$gVol. 215, p. 117025 -$$p117025 -$$tActa materialia$$v215$$x1359-6454$$y2021 000893738 8564_ $$uhttps://juser.fz-juelich.de/record/893738/files/Mechanism_for_breakaway_oxidation_of_the_Ti2AlC_MAX_phase%20PDF.pdf$$yPublished on 2021-08-01. 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