Abstract
The heat resistance of NiAl alloys with 4d- or 5d-transition element additives (zirconium, hafnium, niobium, tantalum or tungsten) has been studied at high temperatures: 1373, 1473 and 1573 K. Some regularities for the effect of 3d-, 4d- and 5d-transition element additives on NiAl oxidation have been found. The oxidation kinetics are described by linear and square laws. The boundary concentrations of additives stabilizing the resistance to oxidation of NiAl alloys have been found. The relation between alloy substructures and change in heat resistance is discussed.
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