• Fulltext

       

        Click here to view fulltext PDF


      Permanent link:
      https://www.ias.ac.in/article/fulltext/boms/031/03/0433-0439

    • Keywords

       

      Metallic glass; Al–Ni–La alloys; XRD; crystallization.

    • Abstract

       

      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 a bcc metastable phase precipitates. The second crystallization stage is due to formation of intermetallic compounds along with fcc-Al. Microhardness of all the ribbons was examined at different temperatures and correlated with structural evolutions. Precipitation strengthening of nano-size fcc-Al is responsible for maximum hardness in these annealed alloys.

    • Author Affiliations

       

      K L Sahoo1 Rina Sahu1 M Ghosh1 S Chatterjee2

      1. Metal Extraction and Forming Division, National Metallurgical Laboratory, Jamshedpur 831 007, India
      2. Department of Metallurgical and Materials Engineering, Bengal Engineering and Science University, Howrah 711 103, India
    • Dates

       
  • Bulletin of Materials Science | News

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

© 2017-2019 Indian Academy of Sciences, Bengaluru.