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Electron Diffraction of ThMn12/Th2Zn17-Type Structures in the Nd-Fe-Ti System

Published online by Cambridge University Press:  14 June 2013

Daniela Nunes ,
António P. Gonçalves  and
Patricia A. Carvalho
Daniela Nunes*
Affiliation:
ICEMS, Instituto Superior Técnico, Universidade Técnica de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
António P. Gonçalves
Affiliation:
IST/ITN, Instituto Superior Técnico, Universidade Técnica de Lisboa e CFMC-UL, Estrada Nacional 10, 2863-953 Sacavém, Portugal
Patricia A. Carvalho
Affiliation:
ICEMS, Instituto Superior Técnico, Universidade Técnica de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
*
*Corresponding author. E-mail: daniela.nunes@ist.utl.pt
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Abstract

Nd:11Fe:Ti alloys prepared by arc melting followed by splat quenching and annealing have been investigated by electron microscopy. The as-cast microstructure evidenced an α-Fe(Ti) → NdFe11Ti → Nd2(Fe,Ti)17 solidification sequence compatible with a cascade of peritectic reactions. The Nd2(Fe,Ti)17 phase was not detected in the microstructure of the splat-quenched materials, but after annealing the ternary compound grains consisted of a mixture of ThMn12-type and Th2Zn17-type structures exhibiting a consistent (020)1:12//(003)2:17 and [100]1:12//[110]2:17, orientation relation, with the invariant plane sitting at (022)1:12//(333)2:17. A series of 3D microdiffraction experiments carried out on grains presenting a random distribution of planar defects has been used to map the reciprocal space of the intergrown phases.

Keywords

ThMn12 and Th2Zn17 structurestransmission electron microscopymicrodiffractionintergrowthNdFe11Ti compound
Type
Portuguese Society for Microscopy
Information
Microscopy and Microanalysis , Volume 19 , Issue 5 , October 2013 , pp. 1211 - 1215
Copyright
Copyright © Microscopy Society of America 2013 

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