Characteristics of thermal transitions during annealing of a nanocrystalline Ni3Al-based alloy |
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Authors: | Masoud Nazarian-Samani Ali Reza Kamali |
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Affiliation: | aDepartment of Materials Science and Engineering, Malek Ashtar University of Technology, Ferdowsi St., Shahin Shahr-Isfahan, Iran |
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Abstract: | In this study, the changes in atomic ordering of a Ni3Al-based alloy were investigated. The mechanically alloyed powders were annealed at different temperatures up to 1300 °C and then subjected to X-ray diffraction (XRD) analysis. In addition, differential thermal analysis (DTA) with different heating rates was used for calculating the activation energy (using Kissinger and Augis & Bennet methods) and enthalpy of the three transitions: atomic ordering of crystalline structure, transformation of and melting. According to the results obtained, the maximum atomic ordering in this Ni3Al-based alloy obtained at 600 °C, beyond which it decreased with increasing temperature. Ultimately, atomic ordering completely vanished at 1300 °C due to a lattice transformation occurring from L12 ordered structure to the Ni-based solid solution phase. |
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Keywords: | Ni3Al-based alloy Enthalpy X-ray diffraction Thermal analysis |
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