Crystallisation of amorphous Al-Y-Ni-(Cu) alloys
Source abstract
Abstract
The nanocrystallisation behaviour and subsequent intermetallics formation of an amorphous Al 88-Y 4-Ni 8 alloy has been studied. A 1 at.% of Al or Ni was also substituted by Cu and its effect studied. Differential scanning calorimetry has been used to measure the thermal stability of these amorphous alloys. Transmission electron microscopy showed the smaller size of the nanocrystals obtained during primary crystallisation when Cu is added. Using three-dimensional atom probe, it has been checked that Cu is homogeneously distributed in the amorphous matrix, not contributing to a heterogeneous nucleation around Cu clusters during the formation of nanocrystals. Transmission electron microscopy and X-rays diffraction are used to study the controversial intermetallics occurrence at higher temperatures. The sequence and characteristics of the intermetallics appearing in these alloys were sensitive to the presence of Cu. The evolution of these intermetallics, up to 600 °C, has been studied. Findings are compared with previous studies.
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Research context
OpenAlex topics: Metallic Glasses and Amorphous Alloys · Phase-change materials and chalcogenides · Quasicrystal Structures and Properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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