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Amorphous Alloys by Powder Compacting

#1751


Technology Development for Obtaining of Enhanced Magnetic Properties Amorphous Alloys (Metal Glasses) by Shock-Wave Compacting Powder Materials for Magnetic Applications

Tech Area / Field

  • MAT-ALL/High Performance Metals and Alloys/Materials
  • MAT-SYN/Materials Synthesis and Processing/Materials

Status
8 Project completed

Registration date
23.12.1999

Completion date
13.03.2007

Senior Project Manager
Zalouzhny A A

Leading Institute
VNIIEF, Russia, N. Novgorod reg., Sarov

Collaborators

  • Los Alamos National Laboratory/Plasma Physics Applications Group, USA, NM, Los-Alamos

Project summary

The proposed Project is devoted to the technique development for producing amorphous alloys (metallic glass) with enhanced magnetic properties by using the procedure of dynamic (shock wave) compaction (DC) at powder materials.

Amorphous alloys are of unique practical value and essential, scientific interest. However, in spite of continuously increasing scope of applications and investigations of these systems, a great deal of key physics problems of amorphous state remain unsolved. The interest in metal glass (MG) proceeds from such outstanding technological features as high magnetic permeability, low coercive force, high mechanical viscosity, yield limit, high corrosion resistance and temperature-unaffected electrical conduction that underlie its wide practical application.

Currently, the following procedures for producing amorphous metals are available: 1) evaporation of metals in vacuum and deposition of their vapors onto a cooled substrate; 2) atomization, with atoms escaping the source due to the accelerated high-energy atoms of an inert gas; 3) chemical deposition, i.e. the procedure involving deposition of ions, resulting from the chemical reaction, onto the substrate in water solution; 4) electrodeposition involving external electrical potential required for a chemical reaction to take place; 5) fast solidification from the liquid state. A number of researches have demonstrated that MG can be produced by employing DC involving high explosives (HE). One of the DC challenges is to produce densities similar to those of monocrystals.

The unique expertise of employing HE for powders’ dynamic (explosive-driven) compaction, involving shock waves (SW) with the intensity ranging from 5 to 50 GPa, is available at RFNC-VNIIEF. Under the above conditions, samples preserve their integrity, and densities approaching those of monocrystals are produced. With the materials’ explosive –driven compaction, favorable conditions for MG synthesis can be created, i.e. high pressures (5-50 GPa), temperatures approaching that of the melting point (1000-1500 K) and extremely short pulses (2-10 s). As the result of the above conditions, on the one hand, a high level of material compaction is achieved and, on the other hand, SWs enable to generate a disordered crystal structure since the parameters of the crystal lattice change considerably in the shock front.

Under the project, the alloys will be identified that are deemed advisable to produce employing a DC procedure. MG is subpided into the following two types: metal - metalloid and metal - metal alloys. Proceeding from the intended use of a product produced and the parameters required, Fe-, Ni- or Co - based alloys will be selected with B, Si, Cr, Mo and Mg admixtures.

For instance, to manufacture an isolation transformer, the 2605S-2 alloy (Fe-78%, B-13%, Si-9%) is employed. This alloy offers high saturation induction, low losses in the core and a minimal relative cost. At the stage of selecting and producing alloys, having the required chemical composition, experts in material properties and material science will participate.

Specialists in the area of fabricating HE and charging initiators and firing devices will take part in the project to pick up the type of HE employed, to charge explosive assemblies and to develop the explosive loading techniques.

Once the samples are fabricated, their mechanical, electrical and magnetic properties will be tested and X-ray analysis will be carried out. These investigations will involve the experts in the area of electromagnetics.

The project execution will result in selecting materials that are advisable to synthesize employing the DC procedure and developing procedures for producing alloy powders and their dynamic compaction. During the course of the work, computer codes, describing the aspects of procedures developed, and computational and theoretical models will be used.

The collaborators’ role under the project is to identify materials and to search for customers for applying the developed procedures and techniques for industrial manufacturing of electrical equipment units.


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