Effect of Fe on the constitution of Cu–W alloys at 1200 °C

• Published in: Journal of alloys and compounds 2003-10, Vol.361 (1), p.222-226
• Main Authors: Gauthier, V, Robaut, F, Upadhyaya, A, Allibert, C.H
• Format: Article
• Language: English
• Subjects: Alloys; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Liquid–solid reaction; Materials science; Phase diagram; Phase diagrams and microstructures developed by solidification and solid-solid phase transformations; Phase diagrams of metals and alloys; Physics; Powder metallurgy
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/S0925-8388(03)00434-1

The phase equilibria of the Cu–W–Fe system were studied experimentally, except for the Cu–Fe limit region. The isothermal section at 1200 °C was determined from analysis of the phases formed after thermal treatment. Forced sedimentation and immersion techniques were used for a reliable sampling of the liquid involved in the liquid/solid phase equilibria. Equilibrium results were complemented by diffusion couple-type experiments. From the Cu–W side, the phase fields formed with increasing Fe content were: {Cu-based liquid+b.c.c. W}, {Cu-based liquid+b.c.c. W+Fe 7W 6}, {Cu-based liquid+Fe 7W 6}, {Cu-based liquid+Fe 7W 6+b.c.c. Fe} and {Cu-based liquid+b.c.c. Fe}. In the ternary system the homogeneity ranges of the Cu-based liquid, b.c.c. W and Fe 7W 6 are very similar to those of the binary phases.