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Structural and phase analysis of rapidly solidified Al-Fe alloys


The structure and phase composition of lightly-doped Al-Fe alloys obtained by ultrarapid quenching from the melt are investigated. The surface of foils was studied using scanning electron microscopy, atomic-force microscopy, and Rutherford backscattering technique. The variation in the phase composition of alloys during annealing was studied by x-ray diffraction technique and by resistivity and microhardness measurements. The Al-Fe alloys have microcrystalline structure with a nonuniform iron content in the near-surface region of the samples. A correlation of depth profiles of iron and phase composition of the foils is observed. It is found that decomposition of the supersaturated α solid solution proceeds in the temperature range 250–350°C. As the annealing temperature increases, a metastable Al6Fe phase is precipitated. In the range 300–500°C, the metastable Al6Fe phase decomposes, and a stable Al3Fe phase is precipitated.

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Correspondence to I. I. Tashlykova-Bushkevich.

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Original Russian Text © I.I. Tashlykova-Bushkevich, E.S. Gut’ko, V.G. Shepelevich, S.M. Baraishuk, 2008, published in Poverkhnost’. Rentgenovskie, Sinkhrotronnye i Neitronnye Issledovaniya, No. 4, pp. 69–75.

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Tashlykova-Bushkevich, I.I., Gut’ko, E.S., Shepelevich, V.G. et al. Structural and phase analysis of rapidly solidified Al-Fe alloys. J. Synch. Investig. 2, 310 (2008).

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