Atom probe tomographic study of L10 martensite in a Pt-modified NiCoCrAlYTa bond coating

The L10 martensite formed in a Pt-modified NiCoCrAlYTa bond coating has been investigated by atom probe tomography. It was found that obvious segregation of Co and Cr occurred in the micro-twins zone inside the martensite lath. Based upon the compositional analysis, it is known that Pt destabilizes the β phase and Co and Cr act as β stabilizers with respect to the β → L10 martensitic transformation. In addition, some α-Cr particles precipitated inside the martensite lath.