| Abstrakt: |
Through an evaluation of the bond energy in eutectic and metastable phases of different crystallographic structures but the same composition in the aluminumgallium system, an explanation is given of the mechanism of phase formation in this and other eutectic systems during quenching. It is shown that a metastable phase is formed in this system from the liquid, where preferred interaction between different atomic species should be expected to occur in the melt. An explanation is also given for the nonoccurrence of the expected expansion of the region of the solid solution based on aluminum above 65% (at.) gallium during ultrarapid cooling of the liquid. Finally, an explanation is offered for the well-known empirical fact that most metastable phases formed during quenching are formed in the region of eutectic or near-eutectic compositions. |
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