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ANTS Seminar: Wednesday, October 15, 2008 at 2:00PM
Eastern
Fabrication of bulk metallic glass foams via severe plastic
deformation
Dr. Suveen
Mathaudhu
US Army Research Laboratory - Weapons and Materials Research Directorate
Personnel protection for soldiers requires thin, shock-absorbing components in composite vest plate. Metallic foams exhibit outstanding energy absorption, due to ductile densification by plastic deformation of their struts. Foams based on bulk metallic glasses (BMG), which have the highest strength of any metals, and as such, should be optimal. An obstacle to the use of BMG foams is the brittle behavior. However, recent demonstrations show that the thin, sub-millimeter, struts of BMG foams are ductile in compression, with outstanding energy absorption. The work presented here will demonstrate that equal channel angular extrusion (ECAE) can be used to create composites of BMG powders and metallic powders (Cu, Ni, W) which can subsequently be converted to BMG open-cell foams by leaching of the metallic second phase. These foams show excellent mechanical properties and particularly high energy absorption. Comparisons with similar melt cast BMG foams will be made. The talk will cover the overview of severe plastic deformation processing, metallic glass powder consolidation and foam fabrication by ECAE.
All seminars take place at 500 Technology Square (MIT
Building NE47), First Floor Seminar Room. Any member of
the MIT or Army communities is welcome to attend. For more
information, write to isn@mit.edu.
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