Characterization of Ni-Fe-W matrix alloys in as-cast and heat treated conditions

Abstract Present work described the detail microstructural characterization of the two matrix alloys (Alloy I: 53Ni-29Fe-18W and alloy II: 43Ni-11Fe-30W-16Co). These alloys are prepared by a combination of powder and ingot metallurgy route display close to theoretical density. Both the alloys exhibit the presence of single fcc phase in as-cast condition. The Alloys I and II demonstrate the presence of single and two phases in heat treated condition, respectively. The present alloys can be prepared using conventional ingot metallurgy route with maximum solubility of W in matrix. The solubility of W in matrix of both the alloys is nearly same although the alloy II displays the presence of Co 7 W 6 intermetallic phase. The intermetallic phase Co 7 W 6 is observed only at the grain boundaries. This has been attributed to enrichment or micro-segregation of Co during solidification.