Details

Autor(en) / Beteiligte

• Voiculescu, I
• Geanta, V
• Ionescu, M

Titel

EFFECTS OF HEAT TREATMENTS ON THE MICROSTRUCTURE AND MICROHARDNESS OF Al sub( x)CrFeNiMn ALLOYS

Ist Teil von

• Annals of "Dunărea de Jos" University of Galaţi. Fascicle XII, Welding Equipment and Technology, 2015-01, Vol.26, p.5-5

Erscheinungsjahr

2015

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• The new metallic materials called high entropy alloys, obtained by using at least five different chemical elements introduced in quasi-equiatomic percent, have outstanding features of hardness and toughness, being an interesting alternative for use as hardfacing by welding on components subjected to severe stress and abrasive wear. The paper shows the effect of heat treatments applied to high entropy alloys from the Al sub( x)CrFeNiMn family, by studying the changes of microstructure and micro-hardness. Four different types of alloys have been analyzed, with different content of aluminum, for which two series of aging were applied: the first one at a temperature of 700 degree C for 4 hours followed by cooling in air and the second one to 700 degree C for 4 hours combined with maintenance at 1100 degree C for 2 hours and cooling in air. Microstructural aspects have revealed the tendency of precipitation and spheroidizing of intermetallic compounds in the matrix and some grain refining processes. It was found that, for certain alloys (HT3), heat treatments resulted in the doubling of hardness, while for others (HT6, HT8 and HT12) the hardness had only an insignificant modification compared to the as-cast state.