Thermal de-vitrification and formation of single phase nano-crystalline structure in Fe-based metallic glass alloys

Ayodele Olofinjana; K S Tan

doi:10.1016/j.jmatprotec.2007.03.047

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Thermal de-vitrification and formation of single phase nano-crystalline structure in Fe-based metallic glass alloys

Journal article

Peer reviewed

Thermal de-vitrification and formation of single phase nano-crystalline structure in Fe-based metallic glass alloys

Ayodele Olofinjana and K S Tan

Journal of Materials Processing Technology, Vol.191(1-3), pp.377-380

2007

DOI: https://doi.org/10.1016/j.jmatprotec.2007.03.047

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Abstract

Mechanical Engineering

Materials Engineering

Manufacturing Engineering

The crystallization temperature obtained in a thermal analyzer has become a conventional means for characterizing the thermal stability of metallic glasses and less importance has been attached to the intermediate crystalline phases until recently that nano-structured alloys can now be prepared by careful heat treatment of metallic glass precursors. This has brought attention to studying in detail, the process of de-vitrification and the formation of intermediate crystalline phases. The de-vitrification of a number of Fe-based metallic glass alloys have been followed with differential scanning calorimeter (DSC). De-vitrification is generally accompanied by two exothermic peaks that signify a two step crystallization reaction. Small additions of transition metallic elements, Cu, Cr, Ta, Nb and Mo alter this shape either leading to complete separation or merging of the two thermal events. Crystallization temperatures characterized by the primary peak temperature varied from 450 °C to 600 °C. The separation between the peaks varied from 0 (for single peak) to more than 100 °C depending on alloy composition. It is found that for alloy compositions where peak separation is less than 20 °C, it was not possible to anneal to single phase nano-structure.

Details

Title: Thermal de-vitrification and formation of single phase nano-crystalline structure in Fe-based metallic glass alloys
Authors: Ayodele Olofinjana (Author) - Universiti Brunei Darussalam, Brunei
K S Tan (Author) - Universiti Brunei Darussalam, Brunei
Publication details: Journal of Materials Processing Technology, Vol.191(1-3), pp.377-380
Publisher: Elsevier S.A.
Date published: 2007
DOI: 10.1016/j.jmatprotec.2007.03.047
ISSN: 0924-0136
Organisation Unit: School of Science and Engineering - Legacy; University of the Sunshine Coast, Queensland; School of Science, Technology and Engineering
Language: English
Record Identifier: 99449005802621
Output Type: Journal article

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Web Of Science research areas: Engineering, Industrial; Engineering, Manufacturing; Materials Science, Multidisciplinary