Abstract
The aim of this paper was to study the influence of different input materials and methods of treatment on the microstructure, mechanical properties and fracture of dispersion strengthened aluminium alloys in the Al-Al4C3 system. It was proved that the transformation efficiency of carbon to Al4C3 by heat treatment of aluminium with the porous furnace black and electrographite is higher than that of the hard cracked graphite. The size of Al4C3 dispersed phase was measured by TEM on thin foil and it was constant and as small as 30 nm. Subgrain size measured in the range of 100 grains in thin foils depended on the carbon type, as well. It ranged from 0.3 to 0.7 µm. The temperature dependence of ductility, and reduction of area in the temperature range of 623 - 723 K and strain rate of 10 -1 s -1 , indicated a considerable increase of properties. In a case when the volume fraction of Al4C3 changes from lower to higher, the grain rotation mechanism dominates instead of the grain boundary sliding. The dependence of the minimum deflection rate on the applied force as well as the dependence of the time to fracture on the applied force for two temperature levels (623 and 723 K) by small punch testing is depicted. The anisotropy of the creep properties and fracture using small punch tests for the Al-Al4C3 system produced by ECAP were analysed.
Highlights
Mechanical alloying is the process of production of macroscopically homogeneous materials from heterogeneous mixtures
The aim of this paper is to study the influence of the various graphite types and heat treatment procedure on the microstructure, mechanical properties and fracture of dispersion strengthened aluminium alloys in the Al-Al4C3 system with micro and nanostructures
During the milling of Al-1C system with the carbon type I microstructure changes occurred in the fracture processes and welding of the particles with incorporation of C phase
Summary
Mechanical alloying is the process of production of macroscopically homogeneous materials from heterogeneous mixtures. The process is implemented in laboratories in attritors, on the industrial scale in high energy ball mills. It is based on deformation, repeated disintegration and welding of power particles during intensive dry milling. %. The aluminium composite dispersion strengthened by Al4C3 particles has been prepared by the method of mechanical alloying. The obtained mixture was compacted at 600 MPa and heat treated at 723, 773, 823, and 873 K whereas treatment times of 1, 3, 10, and 30 hours were employed.
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