Powder metallurgical processing of Tb sub 0. 27 Dy sub 0. 73 Fe sub 2 minus X (0 lt X le 0. 5) by a hydrogen-decrepitation (HD) route

Journal Article · Tue May 01 04:00:00 EDT 1990 · Journal of Applied Physics; (USA)

DOI:https://doi.org/10.1063/1.344703· OSTI ID:6838639

Jones, D G.R.; Abell, J S; Harris, I R ^[1]

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1. School of Metallurgy and Materials, University of Birmingham, Birmingham, United Kingdom (GB)

The hydrogen absorption/desorption behavior of giant magnetostrictive alloys represented by the general formula Tb{sub 0.27}Dy{sub 0.73}Fe{sub 2{minus}{ital X}} (0{lt}{ital X}{le}0.5) has been investigated to provide background information for the production of powder by the hydrogen-decrepitation (HD) route. X-ray-diffraction studies indicate a range of hydriding behaviors depending upon the particular conditions. Thus, cubic, rhombohedral, and amorphous hydrides have been observed and under certain conditions disproportionation occurs with the production of iron and rare-earth hydrides. Metallographic examination of the latter material reveals the phases produced by this disproportionation. Sintered compacts have been made from the disproportionated material by the HD process and compacts with up to 96% of theoretical density have been achieved after only 1-h sinters. The static magnetostrictive properties of these compacts have been investigated, and compare well with values obtained by other workers on samples produced using conventional powder metallurgical methods. The HD process appears to offer significant advantages over more conventional powder metallurgical routes for the production of compacts of these materials.

• OSTI ID: 6838639
• Journal Information: Journal of Applied Physics; (USA), Journal Name: Journal of Applied Physics; (USA) Vol. 67:9; ISSN 0021-8979; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101* -- Metals & Alloys-- Preparation & Fabrication
ADSORPTION
ALLOYS
AMORPHOUS STATE
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CUBIC LATTICES
DESORPTION
DYSPROSIUM ALLOYS
ELEMENTS
FABRICATION
HYDROGEN
IRON ALLOYS
MAGNETIC PROPERTIES
MAGNETOSTRICTION
METALLURGY
NONMETALS
ORTHORHOMBIC LATTICES
PHYSICAL PROPERTIES
POWDER METALLURGY
RARE EARTH ALLOYS
SORPTION
TERBIUM ALLOYS