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Using atom probe tomography to analyse MAX-phase materials

Marie Sonestedt (Institutionen för teknisk fysik, Mikroskopi och mikroanalys) ; Krystyna Stiller (Institutionen för teknisk fysik, Mikroskopi och mikroanalys)
Ultramicroscopy (0304-3991). Vol. 111 (2011), 6, p. 642-647.
[Artikel, refereegranskad vetenskaplig]

Ti2AlC belongs to an interesting group of materials with both metallic and ceramic properties. This material is highly attractive as a candidate for corrosion resistant coatings. The process of fabrication of such coatings is in the investigation stage only and the detailed knowledge of the structure and chemistry of the produced coatings is important for optimisation of their properties. In this work the applicability of atom probe tomography for investigation of both Ti2AlC bulk materials and coatings was tested. We show that for the first time, Ti2AlC has successfully been analysed using laser pulsing mode in a local electrode atom probe and the results from analysis of both bulk Ti2AlC and Ti2AlC based spray deposited coatings are presented. It appears that, in this particular material system, it is difficult to obtain the accurate stoichiometry. This is due to the loss of detection because of unavoidable multiple events and due to the peak overlaps present. Methods of how to approach these problems are discussed.

Nyckelord: Atom probe tomography, Laser pulsing, Ti2AlC, Coating, Oxygen content



Denna post skapades 2012-03-08.
CPL Pubid: 155736

 

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Institutioner (Chalmers)

Institutionen för teknisk fysik, Mikroskopi och mikroanalys (2005-2012)

Ämnesområden

Materialteknik

Chalmers infrastruktur

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Microstructure and properties of coatings produced by spray deposition of Ti2AlC powders