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Rina Sahu
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Volume 31 Issue 3 June 2008 pp 433-439
Studies on crystallization behaviour and mechanical properties of Al–Ni–La metallic glasses
K L Sahoo Rina Sahu M Ghosh S Chatterjee
Alloy ingots with nominal composition, Al92–𝑥Ni8La𝑥 (𝑥 = 4 to 6) and Al94–𝑥Ni6La𝑥 (𝑥 = 6, 7), were prepared by induction melting in a purified Ar atmosphere. Each ingot was inductively re-melted and rapidly solidified ribbons were obtained by ejecting the melt onto a rotating copper wheel in an argon atmosphere. The crystallization behaviour of melt-spun amorphous ribbon was investigated by means of differential scanning calorimetry (DSC), X-ray diffractometry and transmission electron microscopy. DSC showed that Al86Ni8La6 alloy undergoes a three-stage and rest of the alloys undergo a two-stage crystallization process upon heating. The phases responsible for each stage of crystallization were identified. During the first crystallization stage
fcc -Al precipitates for low La-containing alloys and for higher La-containing alloys abcc metastable phase precipitates. The second crystallization stage is due to formation of intermetallic compounds along withfcc -Al. Microhardness of all the ribbons was examined at different temperatures and correlated with structural evolutions. Precipitation strengthening of nano-sizefcc -Al is responsible for maximum hardness in these annealed alloys.
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Bulletin of Materials Science
Volume 46, 2023
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Posted on October 12, 2020Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
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