Structural study of borided layers obtained on synthetic Fe−Ni alloys |
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| Authors: | G Principi Ajay Gupta C Badini |
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| Institution: | (1) Dipartimento di Ingegneria Meccanica, Sezione Materiali, Università di Padova, Via Marzolo 9, 35131 Padova, Italy;(2) Dipartimento di Scienza dei Materiali e Ingegneria Chimica, C.so Duca degli Abruzzi 24, 10129 Torino, Italy;(3) Department of Physics, Devi Ahilya University, 452001 Indore, India |
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| Abstract: | Carbon free Fe?Ni alloys (12 and 20 wt.% Ni) have been analysed by X-ray diffraction and surface Mössbauer spectroscopy (CXMS and CEMS) after boriding treatment at 1273 K for 20 hours. Some (Fe x Ni l-x )2B and Fe x Ni l-x B samples, with different values ofx, obtained by heating at 1073 K mixtures of elements in powder form, were used as reference. Besides (Fe x Ni l-x )2B and Fe x Ni l-x B, a third boride phase rich in boron has been detected in the outer borided layers of the alloy specimens. A third phase appears also in the corresponding X-ray patterns. A comparison between CXMS and CEMS data show that (Fe x Ni l-x )2B is present only in the deeper part of the borided layers and that the outer surface layer is a mixture of a nickel and boron rich boride and of a superparamagnetic oxide. |
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