| CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
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Thermal Expansion of Ni$_{3}$Al Intermetallic Compound: Experiment and Simulation |
| Hai-Peng Wang, Peng Lü, Kai Zhou, Bing-Bo Wei** |
MOE Key Laboratory of Space Applied Physics and Chemistry, Department of Applied Physics, Northwestern Polytechnical University, Xi'an 710072
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| Cite this article: |
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Hai-Peng Wang, Peng Lü, Kai Zhou et al 2016 Chin. Phys. Lett. 33 046502 |
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Abstract The thermal expansion of Ni$_{3}$Al intermetallic compound is determined by a thermal dilatometer and simulated by the molecular dynamics method. The results of the linear thermal expansion coefficients are presented from 200 K up to the maximum temperature of 1600 K. The single phase of Ni$_{3}$Al intermetallic compound is confirmed by x-ray diffraction together with DSC melting and solidification peaks, from which the solidus and the liquidus temperatures are obtained to be 1660 and 1695 K, respectively. The measured linear thermal expansion coefficient increases from $1.5\times10^{-5}$ to $2.7\times10^{-5}$ K$^{-1}$ in the experimental temperature range, in good agreement with the data obtained by the molecular dynamics simulation, just a slight difference from the temperature dependence coefficient. Furthermore, the atomic structure and position are presented to reveal the atom distribution change during thermal expansion of Ni$_{3}$Al compound.
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Received: 31 December 2015
Published: 29 April 2016
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| PACS: |
65.40.De
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(Thermal expansion; thermomechanical effects)
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31.15.-p
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(Calculations and mathematical techniques in atomic and molecular physics)
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