Pressure effects on Al[sub 89]La[sub 6]Ni[sub 5] amorphous alloy crystallization

Zhuang, Y. X.; Zhuang, Y.X.; Jiang, J. Z.; Jiang, J.Z.; Zhou, T. J.; Zhou, T.J.; Rasmussen, H.; Gerward, L.; Mezouar, M.; Crichton, W.; Inoue, A.
December 2000
Applied Physics Letters;12/18/2000, Vol. 77 Issue 25
Academic Journal
The pressure effect on the crystallization of the Al[sub 89]La[sub 6]Ni[sub 5] amorphous alloy has been investigated by in situ high-pressure and high-temperature x-ray powder diffraction using synchrotron radiation. The amorphous alloy crystallizes in two steps in the pressure range studied (0-4 GPa). The first process, corresponding to simultaneous precipitation of fcc-Al crystals and the metastable bcc-(AlNi)[sub 11]La[sub 3]-like phase, is governed by a eutectic reaction. The second process corresponds to the transformation of a residual amorphous alloy into fcc-Al, Al[sub 11]La[sub 3], Al[sub 3]Ni, and as yet unidentified phase(s). The applied pressure strongly affects the crystallization processes of the amorphous alloy. Both temperatures first decrease with pressure in the pressure range of 0-1 GPa and then increase with pressure up to 4 GPa. The results are discussed with reference to competing processes between the thermodynamic potential barrier and the diffusion activation energy under pressure. © 2000 American Institute of Physics.


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