Home Metallic Materials - Kovové materiály 2014 Metallic Materials Vol. 52 (2014), no. 6, pp.395-402

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Metallic Materials Vol. 52 (2014), no. 6, pp.395-402

Title: Strengthening mechanisms in the nanocrystalline Cu with Al2O3
Author: M. OROLINOVA, J. ĎURIŠIN, K. ĎURIŠINOVÁ, Z. DANKOVÁ, M. BESTERCI, M. ĎURIŠIN, J. SZABÓ

Abstract: Nanocrystalline (nc) Cu materials with Al2O3 dispersoid (1 and 5 vol.% Al2O3) were produced using the powder metallurgy (PM) techniques. The effect of reinforcement weight fraction, deformation temperature and annealing temperature (up to 800 °C) on the strength properties and the microstructure was studied. Two strengthening mechanisms were considered at room temperature, strengthening by grain refinements and dispersion strengthening (DS). The strength properties of both nc Cu composites were strongly dependent on deformation temperature and material composition. The main contribution of nanometric Al2O3 particles to the strength of composites at elevated temperatures is probably the strong pinning effect on the grain/crystallite boundaries and preventing of recrystallization process. After annealing at 0.74Tm both composites were characterized by an excellent stability of strength characteristics.

Keywords: dispersion strengthened nanocrystalline copper, strengthening mechanisms, strength properties, microstructure
Year: 2014, Volume: 52, Issue: 6 Page From: 395, Page To: 402
doi:10.4149/km_2014_6_395


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