Reactive introduction of oxide nanoparticles in additively manufactured 718 Ni alloys with improved high temperature performance

Alloy 718 has been intensively investigated for additive manufacturing. While previous studies on additively manufactured alloy typically have metallic phases only, in this work, we show that oxide nanoparticles can be introduced into via a reactive sintering mechanism. The introduction of micron scale Cr2O3 powder led to the formation homogeneous distribution Al and Ti rich nanoparticles. This surprising finding arises from chemical reaction between powders metal matrix containing Ti. In comparison control without oxides, presence dramatically alters microstructure, leading relatively more equiaxed grain structure, while also reducing residual stress. mechanical testing two material groups demonstrates comparable strength tensile ductility at room temperature, high-temperature (900 °C) properties samples were significantly improved over samples. apparent possibilities using process introduce materials may general implication fabrication dispersion various matrices