Design and Characterization of a Novel NiAl–(Cr,Mo) Eutectic Alloy

Abstract

To enhance the mechanical properties of NiAl‐(Cr,Mo) in‐situ composites for high‐temperature structural use, achieving a regular eutectic microstructure is crucial. A novel alloy with a composition of has been developed that exhibits a significantly reduced solidification interval compared to well studied alloys such as . This advancement results from using the in‐house developed alloy design tool PyMultOpt and CALPHAD analysis to minimize the solidification interval. The refined alloy demonstrates a theoretical solidification interval of 0 K. These results are verified with differential scanning calorimetry (DSC) measurements at different heating rates for the new alloy and compared with the established alloy . The small solidification interval leads to an uniform eutectic microstructure consisting of a (Cr,Mo)‐phase embedded in the NiAl‐matrix without primary NiAl dendrites present. This indicates that deviating from the stoichiometric NiAl composition results in a significantly lower solidification interval and thus in an actual eutectic composition of the NiAl‐(Cr,Mo) system.This article is protected by copyright. All rights reserved.