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J. Phys. IV France
Volume 113, January 2004
Page(s) 81 - 84

J. Phys. IV France
113 (2004) 81
DOI: 10.1051/jp4:20040018

Stabilité thermique de la phase $\beta$Al 5FeSi dans le système ternaire Al-Fe-Si

S. Pontevichi, F. Bosselet, M. Peronnet and J.C. Viala

Laboratoire des Multimatériaux et Interfaces, UMR CNRS 5615, Université Lyon I, 69622 Villeurbanne Cedex, France

DTA and isothermal diffusion experiments have been carried out at temperatures up to 727  $^{\circ}$C in the Fe-Al-Si ternary system. in these experiments, we have observed the themal decomposition of the solid ternary compound $\beta$Al 5FeSi ( $\tau$6) into another ternary compound, $\gamma$Al 5Fe 2Si 2 ( $\tau$2), and a liquid. Under the atmospheric pressure, that decomposition of $\beta$Al 5FeSi occurs at temperatures ranging hnn $661 \pm 5$  $^{\circ}$C to $667 \pm 5$  $^{\circ}$C. A polythermal projection combining these new results with previously published data is given to describe the crystallisation of ternary Al-Fe-Si liquid alloys upon slow cooling from 727  $^{\circ}$C.

© EDP Sciences 2004