Mechanical alloying of Al-C system

Besterci, Michal and Sülleiová, Katarína and Velgosová, Oksana (2011) Mechanical alloying of Al-C system. In: VI International Conference on Mechanochemistry and Mechanical Alloying (INCOME 2008), 1-4 December 2008, NML Jamshedpur, India.



A method of mechanical alloying process is described. Carbon transformation to Al4C3 is characterised within the different heat treatment schedules and nine commercial carbon powders are tested. The micromechanism of carbon incorporation into the metallic powder, and its compacting are described. The influence of dispersed carbides on mechanical properties is evaluated together with the influence of deformation on microstructure and properties. 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. Microstructure changes consisted of fracture processes and welding of the particles with incorporation of C phase and forming of final granules. The dispersed phase Al4C3 particle size was measured on 200 to 300 thin foil structures, and it was constant and as small as 30 nm. The particle size was influenced neither by the carbon type nor by the heat treatment applied. 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. Using a depth sensing indentation (DSI) technique, the Martens hardness, indentation modulus E and deformation work W for Al matrix and Al4C3 particles have been measured. It has been shown that the hardness of particles is 5–7 times higher than the hardness of the matrix. The temperature dependence of ductility, and reduction of area in the temperature range of 350 –450°C and strain rate of 10-1 s-1, indicated a considerable increase of these 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.

Item Type:Conference or Workshop Item (Paper)
Official URL/DOI:
Uncontrolled Keywords:Aluminium-graphite powder system, Mechanical alloying, Carbon to Al4C3 transformation, Microstructure, Mechanical properties
Divisions:Metal Extraction and Forming
ID Code:5091
Deposited On:04 May 2012 12:33
Last Modified:04 May 2012 12:33
Related URLs:

Repository Staff Only: item control page