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Thermal stability of an Al/Ni3Al composite processed by powder metallurgy

AuthorsLieblich, Marcela ; González-Carrasco, José Luis; Caruana, Guillermo
Issue Date1997
CitationIntermetallics 5: 515-524 (1997)
AbstractThe potential of Al/Ni3Al composites for high-temperature applications, especially when friction is involved, is currently being explored. In this work, the thermal stability of an Al/Ni3Al composite obtained by extrusion of Al and 5 vol% of spherical Ni3Al powder particles was investigated at temperatures up to 500°C. The metal/intermetallic composite proved stable up to 300°C. At higher temperatures, dissolution of Ni3Al particles occurred with formation of concentric layers of Al3Ni and Al3Ni2 phases. The amount of Ni aluminides for each annealing condition was determined by applying a specifically developed mathematical procedure. Dissolution of Ni3Al up to 500°C was found to obey a parabolic-type law with an activation energy of 156 kJ mol-1. Activation energies for growth of Al3Ni2 and Al3Ni were 209 and 110 kJ mol-1, respectively, in agreement with the literature. The thermal stability shown by this composite makes it a good candidate for high-temperature applications up to 300°C. © 1997 Elsevier Science Limited.
Identifiersdoi: 10.1016/S0966-9795(97)00027-7
issn: 0966-9795
Appears in Collections:(CENIM) Artículos
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