Thermodynamic Study of Liquid, Crystalline and Quasi-Crystalline Al-Mn Phasesстатья

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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.

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[1] Thermodynamic study of liquid, crystalline and quasi-crystalline al-mn phases / A. I. Zaitsev, N. E. Zaitseva, N. A. Arutyunyan, B. M. Mogutnov // Journal of Phase Equilibria and Diffusion. — 2008. — Vol. 29, no. 1. — P. 20–29. Thermodynamic properties of liquid, intermetallic, and quasi-crystalline phases of the Al-Mn system have been studied using two experimental techniques: integral effusion method and Knudsen-cell mass spectrometry. The functions of the liquid phase followed the laws of associated solution and indicated that three type complexes, AlMn, Al2Mn, and Al5Mn, existed in the melt. Phase equilibria calculated using this model and the intermetallic compounds thermodynamic characteristics were in close agreement with phase diagram. The decagonal phase was found to be more stable than the icosahedral quasi-crystals. The calculated enthalpies of the quasi-crystalline phase transformation to the equilibrium crystals were close to the available literature information. The difference between the Gibbs energies of both type quasi-crystals and equilibrium crystalline compositions increases with decreasing temperature. This evidence favors the conclusion that the stabilization of quasi-crystals is entropic in nature and that the quasi-crystalline state, similar to the glassy state in metallic alloys, is only intermediate between liquid and crystals. The conditions of the quasi-crystals formation were found to be closely related to a certain type of the chemical short-range order in liquid, namely to significant mole fraction of the Al5Mn associative complexes. [ DOI ]

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