Effect of rare-earth elements on nanophase evolution, crystallization behaviour and mechanical properties in Al-Ni-R (R = La/Mischmetal) amorphous alloys |
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Authors: | K L Sahoo Amitava Mitra Sukomal Ghosh |
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Institution: | (1) National Metallurgical Laboratory, 831 007 Jamshedpur, India |
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Abstract: | The crystallization behaviour and evolution of nanoparticles in amorphous Al-Ni-Mischmetal (Mm) and Al-Ni-La alloys during
heat treatment have been studied. Rapidly solidified ribbons were obtained by induction melting and ejecting the melt onto
a rotating Cu wheel in an Ar atmosphere.
The crystallization behaviour of the melt-spun ribbons was investigated using differential scanning calorimetry and X-ray
diffractometry (XRD). XRD studies confirmed that all the ribbons were fully amorphous. Al-Ni-Mm systems showed a three-stage
crystallization process whereas Al-Ni-La system, in general, showed a two-stage crystallization process on annealing. Crystallization
kinetics was analysed by Kissinger and Johnson-Mehl-Avrami approaches. In Al-Ni-La alloys, the crystallization pathways depend
on the La concentration. Microhardness of all the ribbons was examined at different temperatures and correlated with the corresponding
evolution of phases. |
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Keywords: | Aluminium-based amorphous alloys melt spinning crystallization behaviour microhardness |
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