Abstract
Helium-atomized amorphous Al 85Ni 10La 5 (at.%) powder was investigated in the as-atomized state and after consolidation at room temperature using high pressure torsion. The samples were investigated by scanning electron microscopy, in situ and ex situ angle-dispersive X-ray diffractometry (XRD), ex situ energy-dispersive XRD, differential scanning calorimetry, and inductively coupled plasma mass spectroscopy. The as-atomized powder shows a glass transition and subsequent crystallization of fcc-Al and intermetallic phases within a narrow temperature range upon continuous heating. Primary crystallization of fcc-Al occurs during isothermal heating below the crystallization temperature. After consolidation, no glass transition occurs upon continuous heating. XRD of consolidated disc-shape samples reveal fcc-Al crystals within the residual amorphous matrix. The amount of fcc-Al crystals increases with plastic shear deformation along the disc radius and with rotation angle. The results indicate that the primary precipitation of fcc-Al is strain-induced and possibly athermal.
Published Version
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