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Thermodynamic modeling of site occupation in the γ′ phase of the NiAlHf system

✍ Scribed by N.C. Tso; J.M. Sanchez

Publisher
Elsevier Science
Year
1989
Tongue
English
Weight
457 KB
Volume
108
Category
Article
ISSN
0921-5093

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✦ Synopsis

A thermodynamic study is performed on the sublattice site occupation preference of hafnium in the ternary 7' ordered phase of the Ni-Al-Hf system. The parameters used in the semiempirical thermodynamic model are determined by fitting the ternary Ni-Al-Hf y-y' phase boundaries and experimental thermochemical data for the corresponding binary systems. The model predicts that hafnium has a strong preference for the aluminum sites in the bulk 7' phase, which is in agreement with atom probe field ion microscope and electron channeling measurements.

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