The combination of precipitation and dispersion hardening in powder metallurgy produced Cu–Ti–Si alloy

• Published in: Materials characterization Vol. 59; no. 8; pp. 1122 - 1126
• Main Authors: BOZIC, D, DIMCIC, O, DIMCIC, B, CUIJOVIC, I, RAJKOUIC, V
• Format: Journal Article
• Language: English
• Published: New York, NY Elsevier Inc 01.08.2008; Elsevier
• Subjects: AGING; COPPER ALLOYS; Cross-disciplinary physics: materials science; rheology; Cu–Ti–Si; DISPERSION HARDENING; Exact sciences and technology; HEAT TREATMENTS; HOT PRESSING; HYDROGEN; MATERIALS SCIENCE; MICROHARDNESS; MICROSTRUCTURE; PARTICLES; Phase diagrams and microstructures developed by solidification and solid-solid phase transformations; Physics; POWDER METALLURGY; POWDERS; PRECIPITATION; PRECIPITATION HARDENING; SILICON ALLOYS; Solidification; TITANIUM ALLOYS; Cu–Ti–Si; Precipitation hardening; Dispersion hardening; Cu-Ti-Si; Precipitation; Microstructure; Powder metallurgy
• ISSN: 1044-5803; 1873-4189
• DOI: 10.1016/j.matchar.2007.09.005

Microstructure and microhardness properties of precipitation hardened Cu–Ti and precipitation/dispersion hardened Cu–Ti–Si alloys have been analyzed. Cu–1.2Ti and Cu–1.2Ti–3TiSi 2 (wt.%) atomized powders were characterized before and after consolidation by HIP (Hot Isostatic Pressing). Rapidly solidified powders and HIP-ed compacts were subsequently subjected to thermal treatment in hydrogen at temperatures between 300 and 600 °C. Compared to Cu–Ti powder particles and compacts, obtained by the same procedure, the strengthening effect in Cu–1.2Ti–3TiSi 2 powder particles and compacts was much greater. The binary and ternary powders both reveal properties superior to those of Cu–1.2Ti and Cu–1.2Ti–3TiSi 2 compacts. Microhardness analysis as a function of the aging temperature of Cu–1.2Ti–3TiSi 2 alloy shows an interaction between precipitation and dispersion hardening which offers possibilities for an application at elevated temperatures.