Hardened Aluminum with Oxide Particles
Journal Title: Analele Universitatii "Dunarea de Jos" din Galati. Fascicula IX, Metalurgie si Stiinta Materialelor - Year 2006, Vol 29, Issue 2
Abstract
The paper presents the effect of size and dispersion degree of the particles of aluminum oxide, on structure, mechanical characteristics and phenomena that take place when heating at different temperatures for recrystallization, for some samples obtained through deformation of superficially oxidized aluminum powder. The powder necessary for research had a grain size smaller than 40 μm and it was obtained in lab on a pulverization installation with air-jet. The fine film dispersion of oxide in the metallic matrix was obtained as an effect of extrusion with high degrees of the compressed products of superficially oxidized powder (from compressed with diameter of 20 mm to tests with diameter of 3 and respectively of 4 mm). For comparison reasons semi-products of cast aluminum were deformed under the same conditions. The maintaining temperatures of thermal treatment ranged from 350-550 C. At heating the oxide particles are stable and have a role of barrier against dislocations, therefore delay the interactions among dislocations and thus maintaining high mechanical resistances for the hardened aluminum matrix as compared to cast aluminum (without particles). The hardening effect through dispersion is as much higher as the deformation degree of tests from superficially oxidized powder increased, which determined o more pronounced finishing of the oxide particles and a greater dispersion of the fine oxide particles in aluminum matrix.
Authors and Affiliations
Florentina POTECAŞU, Octavian POTECAŞU, Elena DRUGESCU
Keywords
Related Articles
- EP ID EP663522
- DOI -
- Views 49
- Downloads 0
Contributions Regarding the Development of New Types of Solar Actuators
The paper presents the authors’ contributions to the development of solar actuators with bimetallic band and Bourdon tube in the EMAD Research Centre of ”Ștefan cel Mare” University of Suceava. The solutions and the expe...
Jassy Achievements Regarding the Casting of Art Pieces for Artificial Lighting in Orthodox Churches
In this paper are presented some art pieces, used in orthodox religion for artificial general lighting. These pieces, realized at SC RANCON SRL Jassy, present a special importance, because they join harmoniously the func...
The Sonic Waste Water Treatment
Sonic technology means the technology where the sonic devices are used and where the intensification of the heat and mass transfer is obtained owing to the pressure or flow capacity oscillations, introduced in the techno...
The Structural Optimizing of Metallurgical Installations and Mechanisms
The structural optimizing of used mechanisms in the machines construction and metallurgy through the further liberty degrees creation is essential projection problem, as it enters the closing mechanisms case with sliding...
Morphological Aspects and Corrosion Behaviour of Phenol Formaldehyde/Zn Composite Coatings
The present work has the purpose of studying morphological aspects and corrosion behaviour of pure zinc and composite coatings having zinc as metal matrix and phenol – formaldehyde resin type Novolac (RESITAL 6358/1) as...