Experimental Confirmation of Ni5Al3 Phase in Ni-Al Binary System by Diffusion Couple Technique

Chang Fa Li; Yu Ping Ren; Gao Wu Qin

doi:10.4028/www.scientific.net/AMR.299-300.224

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 299-300Experimental Confirmation of Ni5Al3 Phase in Ni-Al...

Experimental Confirmation of Ni₅Al₃Phase in Ni-Al Binary System by Diffusion Couple Technique

Abstract:

The equilibrium phase relationships and compositions of Ni - 51at.%Al/Ni - 26at.%Al diffusion couple heat treated at 650 °C for various times have been investigated by means of diffusion couple technique. Experimental results showed that Ni₅Al₃ phase was not only stable at 650 °C, but also had a large solubility range (45.3～40.6) at.% Al. The obtained relationships of NiAl/Ni₅Al₃ and Ni₅Al₃/Ni₃Al are in accordance with the current generally accepted Ni-Al binary system phase diagram, but their composition ranges are quite different from the presently accepted one, that is, the the phase boundaries of NiAl / (Ni₅Al₃+ NiAl), (Ni₅Al₃ + NiAl) / Ni₅Al₃and Ni₅Al₃ / (Ni₃Al + Ni₅Al₃) significantly shift to the Al-rich side.