Issues »  Volume 39, Issue 6

Phase Stresses as the Cause of Inhibiting Action for the Decomposition of a Metastable State in Superplastic Eutectic Alloys

V. F. Korshak

V.N. Karazin Kharkiv National University, 4 Svobody Sqr., 61022 Kharkiv, Ukraine

Received: 19.04.2017. Download: PDF

The peculiarities of the phase state of the molten two-phase eutectic alloys exhibiting a superplasticity effect are discussed in this paper. For the first time, the physical idea is expressed that the presence of the second phase in the structure of alloys obtained by quenching from high temperatures and containing the supersaturated solid solutions can be the cause of internal elastic stresses, which are determined by the physical properties and distribution of this phase and which have a significant effect on the kinetics of decomposition of such solutions. It is stated that one of the causes of internal stresses in the typical superplastic eutectic alloys can be the difference of volume effect of transformation, i.e. the decomposition of the supersaturated solid solution, which occurs upon the lowering of the temperature in each phase. Using the example of the Sn–38% wt. Pb alloy, it is shown that these elastic stresses can cause the decomposition deceleration of the metastable phase state formed under conditions of non-equilibrium crystallization and subsequent rapid cooling of the alloy, which is observed in the experiment.

Key words: eutectic alloys, metastable phase state, decomposition of supersaturated solid solutions, superplasticity, internal stresses.

URL: http://mfint.imp.kiev.ua/en/abstract/v39/i06/0839.html

DOI: https://doi.org/10.15407/mfint.39.06.0839

PACS: 62.20.fq, 64.60.Ej, 64.60.My, 64.70.kd, 64.75.Nx, 81.30.Mh, 81.40.Ef

Citation: V. F. Korshak, Phase Stresses as the Cause of Inhibiting Action for the Decomposition of a Metastable State in Superplastic Eutectic Alloys, Metallofiz. Noveishie Tekhnol., 39, No. 6: 839—854 (2017) (in Russian)

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