Creep in copper dispersion strengthened with fine alumina particles and reinforced with alumina short fibres—an ODS copper matrix composite

Creep behavior of hot extruded Al-Al2O3 nanocomposite powder

“…Fig. 4 shows the plots of the normalized threshold stress ( th /G) versus the temperature, T. It is seen that th /G decrease with increasing temperature in agreement with previous work performed on ODS copper [19,44] and Al alloys [16] as well as discontinuous aluminum matrix composites fabricated by powder metallurgy route [16]. The relationship between the threshold stress and temperature can be expressed by (R 2 = 0.997) [31]:…”

“…Oxide-dispersion strengthened (ODS) alloys have been considered as a suitable candidate for high-temperature applications for years [16][17][18][19][20]. This is due to their thermal stability caused by stable oxide particles at high temperatures.…”

Microstructure and creep behaviour of an Osprey processed and extruded Al–Cu–Mg–Ti–Ag alloy

“…At these temperatures, the apparent activation energy was found to be higher than that for aluminium self diffusion. Models based on the interaction between dislocations and particles, considering a threshold stress, have been proposed to explain such behaviour [40][41][42][43]. Therefore, the behaviour of the Osprey processed alloy in this temperature range corresponds to that of particulate reinforced composite materials.…”

Synthesis of CuCr and CuCrAg alloys with extended solid solubility with nano-Al2O3 dispersion by mechanical alloying and consolidation by high pressure sintering

“…For the latter approach, addition of an appropriate solute element whose solid solubility decreases with lowering of temperature (say Cr, Ag, Nb or Zr) and precipitation of ultra-fine coherent phases constitute the essential and sufficient conditions. Similarly dispersion of insoluble oxides to form metalmatrix composites is an alternate strategy for strengthening, particularly at elevated temperature [9][10][11]. Correia et al [12] have achieved both precipitation and dispersion hardening in water atomized and warm extruded Cu-Cr and Cu-Cr-Zr alloy powders and studied the microstructural evolution and mechanical properties.…”

“…For elements with restricted or no solid solubility in Cu, ceramic oxide dispersion is known to improve mechanical properties of Cu alloys and enable retention of strength at a high temperature generated during use (i.e. Joule heating, friction and wear) [9,10]. Nanometric materials are characterized by extremely small crystallite/domain size or coherence length at least in one dimension with very high specific surface/interfacial area and unusually large number of atoms constituting such interfaces [20].…”