Abstract
As Pt promotes the reversible martensite transformation, the aim of this study was to assess the influence of Pt on the crystallography of (β′) martensite, in terms of ordering adapted, twinning and stacking faults. The focused ion beam (FIB) milling process was used to prepare transmission electron microscopy (TEM) samples of the NiAlPt bulk alloys, whereby 3R, L10 ordering of the martensite was confirmed. The addition of Pt, coupled with high temperature oxidation resulted in more stacking faults, due to greater Pt diffusion and subsequent enrichment in martensite. For Pt diffusion the temperature must be in excess of 900°C, both for isothermal and cyclic oxidation. When the favorable temperature environment is achieved Pt can diffuse preferentially allowing for promotion of the transformation to martensite.
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