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Devitrification Mechanisms in Al-Y-Ni Glasses

  • A. L. Vasiliev (a1), M. Aindow (a1), M. J. Blackburn (a1) and T. J. Watson (a2)

Abstract

Crystallization of gas atomized Al-Y-Ni alloy powder during consolidation has been studied ex-situ using high-resolution lattice imaging, diffraction and energy-dispersive X-ray spectrometry experiments in a transmission electron microscope. In the as-atomized powder amorphous particles occur but others show some evidence of decomposition. On the application of heat and pressure two types of decomposition product are formed initially; equiaxed nanoscale α-Al grains embedded in an amorphous matrix, and dendritic aluminum structures with veins of amorphous and micro-crystalline phases between the aluminum-rich regions. Complex ordered structures were identified in the α-Al: thin sheets of solute rich material were formed on the {100} and {110} aluminum planes with ordered cubic symmetry. Precursors for the Al19Ni5Y3 and Al3Y phases are formed in the vein regions. The second and third stages of crystallization involve the conversion of these ordered phases and embryonic precipitates to the better-known binary and ternary compounds.

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Devitrification Mechanisms in Al-Y-Ni Glasses

  • A. L. Vasiliev (a1), M. Aindow (a1), M. J. Blackburn (a1) and T. J. Watson (a2)

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