| Title |
Oxidation of Al-Co alloys at high temperatures / |
| Authors |
Šulhánek, Patrik ; Drienovský, Marián ; Černičková, Ivona ; Ďuriška, Libor ; Skaudžius, Ramūnas ; Gerhátová, Žaneta ; Palcut, Marián |
| DOI |
10.3390/ma13143152 |
| Full Text |
|
| Is Part of |
Materials.. Basel : MDPI. 2020, vol. 13, iss. 14, art. no. 3152, p. [1-17].. eISSN 1996-1944 |
| Keywords [eng] |
Al alloy ; Co alloy ; complex intermetallic ; oxidation kinetics ; oxide scale |
| Abstract [eng] |
In this work, the high temperature oxidation behavior of Al71Co29 and Al76Co24 alloys (concentration in at.%) is presented. The alloys were prepared by controlled arc-melting of Co and Al granules in high purity argon. The as-solidified alloys were found to consist of several different phases, including structurally complex m-Al13Co4 and Z-Al3Co phases. The high temperature oxidation behavior of the alloys was studied by simultaneous thermal analysis in flowing synthetic air at 773–1173 K. A protective Al2O3 scale was formed on the sample surface. A parabolic rate law was observed. The rate constants of the alloys have been found between 1.63 × 10−14 and 8.83 × 10−12 g cm−4 s−1. The experimental activation energies of oxidation are 90 and 123 kJ mol−1 for the Al71Co29 and Al76Co24 alloys, respectively. The oxidation mechanism of the Al-Co alloys is discussed and implications towards practical applications of these alloys at high temperatures are provided. |
| Published |
Basel : MDPI |
| Type |
Journal article |
| Language |
English |
| Publication date |
2020 |
| CC license |
|
