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 65
- Downloads 0
Dioxins and Furans as Pollutant Emissions From Integrated Steel Works
In the metallurgical industry are several sources for pollutant emissions but the main source is the sintering process. In this paper are analyzed the generation process of persistent organic pollutant emissions (dioxins...
The Correlation Between Mechanical Characteristics and Technological Parameters in Heat Treatments Applied to Moulding Aluminium Like ATSi5Cu1
The paper contains an experimental study of colligating the technological parameters of the artificial aging operation namely time and soaking temperature with hardness and mechanical strength properties gained after the...
Modelling of the Flow and Deformation Fields at the Profiles Rolling by Field Lines Method
This paper presents a method for modeling of the rolling process based at the deformable continuous medium mechanics, the theory of field lines. The rolling of the profiles and plates may be evaluated as the plane strain...
Methods to Reduce Gas Emissions Onboard Ships
Regarding the latest IMO requirements, the EEDI (Energy Efficiency Design Index) is mandatory to be limited as levels under IMO MEPC requirements. The paper presents some paths to reduce EEDI as are applied onboard a 555...
Thermal Decomposition of Hafnium Ethoxide-Mollecular Precursor for Hafnia Dielectric Thin Films
The HfO2 thin-film is a very promising gate dielectric material for last generation transistors. The paper presents the thermal decomposition of hafnium ethoxide used as molecular precursor for obtaining hafnia thin film...