Influence of Ceramic Nanoparticles on Thermal Stability of Ultra Fine Grained Copper |
| J. Čížek a, I. Procházka a, M. Cieslar a, R.K. Islamgaliev b and O. Kulyasova b
a Charles University in Prague, Faculty of Mathematics and Physics, V Holesovickach 2, CZ-180 00 Praha 8, Czech Republic b Institute of Physics of Advanced Materials, Ufa State Aviation Technical University Ufa 450 000, Russia |
| Full Text PDF |
| Received: 3 09 2007; |
| A detailed study of the bulk ultra fine grained pure copper and copper with Al2O3 particles was carried out in the present work. The specimens were prepared by the high-pressure torsion and their microstructure was investigated by positron lifetime spectroscopy combined with transmission electron microscopy and microhardness tests. Defects in the as-deformed materials were characterized and the thermal stability of the ultra fine grained microstructure was subsequently examined in annealing experiments. An addition of Al2O3 nanoparticles was found to improve significantly the thermal stability of the ultra fine grained structure, the optimum content of Al2O3 being ≈0.5 wt.%. |
| DOI: 10.12693/APhysPolA.113.1285 PACS numbers: 78.70.Bj, 79.60.Jv |