Comparative effect of Mn/Ti solute atoms and TiC/Ni3(Al,Ti) nano-particles on work hardening behaviour in NiCu alloys fabricated by wire arc additive manufacturing

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2019-04, Vol.753, p.262-275
• Main Authors: Marenych, O.O., Kostryzhev, A.G., Pan, Z., Li, H., van Duin, S.
• Format: Article
• Language: English
• Subjects: Additive manufacturing; Age hardening; Aluminum; Copper; Density; Electron microscopy; Fracture toughness; Hardening rate; Heat treating; Heat treatment; Manganese; Mechanical testing; Ni[sbnd]Cu alloys; Nickel base alloys; Precipitation hardening; Solid solutions; Solution strengthening; Strain hardening; Titanium carbide; Transmission electron microscopy; Wire; Wire arc additive manufacturing; Work hardening
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/j.msea.2019.03.040

Two NiCu alloys with various contents of Mn, Ti, Al and C were deposited in a shape of single-bead multi layered walls using wire arc additive manufacturing technology. To modify solute atom concentrations and particle number density values, the as-welded alloys were subjected to annealing at 1100 °C and age-hardening heat treatment in the 610-480 °C temperature range. Microstructure characterisation was carried out using optical, scanning, conventional transmission and atomic resolution transmission electron microscopy. Work hardening behaviour was studied using tensile testing. For similar deposition and heat treatment conditions, an alloy with higher C and Al, and lower Mn contents exhibited a higher number density of >20 nm TiC particles, higher number density of