Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.intermet.2011.04.006
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dc.titleAtomistic mechanism of cyclic phase transitions in Nd-Fe-B based intermetallics
dc.contributor.authorShukla, S.
dc.contributor.authorBanas, A.
dc.contributor.authorRamanujan, R.V.
dc.date.accessioned2014-11-28T08:43:11Z
dc.date.available2014-11-28T08:43:11Z
dc.date.issued2011-08
dc.identifier.citationShukla, S., Banas, A., Ramanujan, R.V. (2011-08). Atomistic mechanism of cyclic phase transitions in Nd-Fe-B based intermetallics. Intermetallics 19 (8) : 1265-1273. ScholarBank@NUS Repository. https://doi.org/10.1016/j.intermet.2011.04.006
dc.identifier.issn09669795
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/113009
dc.description.abstractMechanical milling induced atomic disorder and the mechanism of the cyclic crystal → amorphous → crystal phase transitions in a Nd 2Fe14B intermetallic - based Nd10Fe 85B5 alloy were investigated. Least square first shell fitting of Extended X-ray Absorption Fine-Structure (EXAFS) data of mechanically milled samples revealed that phase evolution during mechanical milling of Nd10Fe85B5 alloy occurred in two stages as a result of two dynamical effects: milling induced forced atomic mixing and enhanced diffusion due to continuous production of point defects. In the first stage of milling, atomic mixing of Nd and Fe atoms dominated, resulting in extensive chemical and structural disorder in the initially ordered intermetallic, followed by amorphization. The second stage of milling was characterized by a remarkable increase in point defect density. Enhanced diffusion resulted in redistribution of alloy atoms and annihilation of these point defects leading to the precipitation of α-Fe nanocrystals in the amorphous matrix. Thus the time evolution of defect structures formed during mechanical milling and their atomic scale interactions led to the cyclic phase transitions in the Nd10Fe85B5 alloy. These milling induced changes in atomic order were found to strongly influence magnetic properties. Crystallization of mechanically milled alloy and effect of annealing parameters on magnetic properties was also analyzed. © 2011 Elsevier Ltd. All rights reserved.
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1016/j.intermet.2011.04.006
dc.sourceScopus
dc.subjectA. Nanostructured intermetallics (including preparation methods)
dc.subjectB. Phase transformation (crystallographic aspects kinetics and mechanisms)
dc.subjectC. Mechanical alloying and milling
dc.subjectD. Defects: point defects
dc.subjectF. Spectroscopic methods, various
dc.typeArticle
dc.contributor.departmentSINGAPORE SYNCHROTRON LIGHT SOURCE
dc.description.doi10.1016/j.intermet.2011.04.006
dc.description.sourcetitleIntermetallics
dc.description.volume19
dc.description.issue8
dc.description.page1265-1273
dc.description.codenIERME
dc.identifier.isiut000292179500022
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