Influence of heat treatment on mechanical properties of micro and nanostructural Al-C systems
A method of mechanical alloying process is described. 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 of the hard cracked graphite. The dispersed phase A14C3 particle size was measured on thin foil structures, and it was constant and as small as 30 nm. Subgrain size measured in thin foils was in 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 10-1s-1, indicated a considerable increase of these properties. Creep behaviour of the Al-Al4C3 composite (with 4 vol. ％ of AI4C3) was studied by small punch testing. The dependence of the minimum deflection rate on the applied force as well as the dependence of the time on the applied force for two temperature levels (623 and 723 K) by small punch testing are depicted. The composite was tested in two different states: a) as received by mechanical alloying with hot extrusion (HE) as the final operation and b) ECAPed (mean grain size of 100-200 nm).
Aluminium-graphite powder system mechanical alloying carbon to AI4C3 transformation microstructure parameters creep characteristics
Michal Besterci Katarina Sulleiova Oksana Velgosova Ferdinand Dobes
Institute of Materials Research, Slovak Academy of Sciences, Watsonova 47, 043 53 Kosice, Slovak Rep Technical University Kosice, Faculty of Metallurgy, Department of Materials Science, Park Komenskeho Institute of Physics of Materials of the Academy of Sciences of the Czech Republic, Zizkovd 22, 616
国际会议
北京
英文
166-170
2012-10-23（万方平台首次上网日期，不代表论文的发表时间）