Explosive compaction of amorphous ferromagnetic metal powders. Final report

Technical Report · Mon Aug 01 04:00:00 EDT 1983

OSTI ID:5341668

Caligiuri, R D

The significant and useful magnetic properties of certain amorphous metals might be better exploited by the electrical industry if these amorphous metals, currently available as ribbon, could be consolidated into high density, principally amorphous, bulk shapes. This work attempted to produce such bodies using explosive compaction techniques. Toroidal specimens, 4.43 cm (1.75 in.) outside diameter, 2.5 cm (1.0 in.) inside diameter, and 1.1 cm (0.43 in.) thick, were successfully produced using a cylindrical explosive compaction technique. The key to this technique was to place a copper rod at the center of the compaction apparatus to minimize the jetting effects produced by a radially convergent compressive shock wave. Relative densities as high as 98% could be produced without extensive crystallization. The saturation fields and initial permeabilities of the rings were close to those measured on the amorphous ribbon. However, the coercive force was higher and the remnant field was lower in the rings relative to the ribbon. This was attributed to the presence of a small volume fraction (less than a few percent) of crystallites in the rings.

• Research Organization: SRI International, Menlo Park, CA (USA)
• OSTI ID: 5341668
• Report Number(s): EPRI-EL-3215; ON: DE84920031
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101* -- Metals & Alloys-- Preparation & Fabrication
COMPACTING
EXPLOSIVE FORMING
FABRICATION
FERROMAGNETIC MATERIALS
MAGNETIC MATERIALS
MAGNETIC PROPERTIES
MATERIALS
MATERIALS WORKING
METALLIC GLASSES
PHYSICAL PROPERTIES
POWDERS