Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1610347 | Journal of Alloys and Compounds | 2015 | 6 Pages |
Abstract
In this study, an influence of mechanical milling on the structural characteristics, mechanical properties and electrical conductivity of the ultrafine Cu-3 vol.% Al2O3 composite is analyzed. The initial Cu-Al2O3 powder was prepared by in situ thermo-chemical technique. Compared are two samples prepared by compacting of the non-milled and the intensively milled powder. The milling process ensured additional powder refinement and uniform distribution of secondary nano-particles in the Cu matrix. In the process of hot extrusion and annealing of the compact at elevated temperatures, the particles effectively strengthened crystallite/grain boundaries. Therefore, the composite has a homogeneous, thermal stable nanostructure up to 900 °C, good hardness of 130 HB and yield strength of 235 MPa. The composite prepared from the non-milled powder is characterized by a bimodal grain size microstructure, low hardness of 80 HB, lower yield strength of 185 MPa and it is structurally stable only up to 200 °C as a consequence of recrystallization processes and grain growth. The electrical conductivity of both materials is sufficient for electrotechnical applications.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
KatarÃna ÄuriÅ¡inová, Juraj ÄuriÅ¡in, Mária OrolÃnová, Martin ÄuriÅ¡in, Juraj Szabó,