NDLI: Variation in Microstructure of Ground SmCo$_{5}$ Alloy During Disproportionation in Hydrogen and Recombination

Content Provider	Springer Nature Link
Author	Bulyk, I. I. Burkhovetskyy, V. V.
Copyright Year	2016
Abstract	Scanning electron microscopy and energy-dispersive X-ray spectroscopy are employed to examine the phase transformations and morphology of ground KS37 alloy (with SmCo$_{5}$ matrix) during solid hydrogenation, disproportionation, desorption, and recombination at 0.4 MPa hydrogen pressure and 950°C. The ground alloy has cellular microstructure. The disproportionation of the ground alloy leads to samarium hydride and cobalt with nanosized grains (35–100 nm). The morphology of the disproportionation products depends on reaction parameters. The desorption and recombination result in a nanosized Sm$_{2}$Co$_{7}$ phase with 40–75 nm grains and a partially nanosized SmCo$_{5}$ phase with 45–140 nm grains. The mechanism whereby the nanostructure of ferromagnetic alloys forms through mechanical and heat treatment with hydrogen is explained. It is based on the variation in morphology during hydrogen-initiated phase transformations and dependences such as grain size of the disproportionation products versus grain size of the alloy before hydrogenation and grain size of the recombined alloy versus grain size of the disproportionation products.
Starting Page	614
Ending Page	623
Page Count	10
File Format	PDF
ISSN	10681302
Journal	Powder Metallurgy and Metal Ceramics
Volume Number	54
Issue Number	9-10
e-ISSN	15739066
Language	English
Publisher	Springer US
Publisher Date	2016-02-24
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	ferromagnetic alloys grinding hydrogen treatment hydrogenation disproportionation desorption recombination phase transformations microstructure nanostructure Characterization and Evaluation of Materials Metallic Materials Ceramics, Glass, Composites, Natural Methods
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Materials Chemistry Mechanics of Materials Metals and Alloys Condensed Matter Physics

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