Anomalous mass transport in Au/304 stainless steel powder under shock loading

Conference · Thu Jan 01 04:00:00 EST 2004

OSTI ID:977464

Staudhammer, Karl P

Dynamic deformation experiments on gold plated 304L stainless steel powders were undertaken using a axial symmetrical implosion geometry. These experiments utilized pressures of 0.08 to 1.0 Mbar and contained a symmetric radial melt region along the central axis of the sample holder. To understand the role of deformation in a porous material, the pressure, and temperature as well as the deformation heat and associated defects must be accounted for. Using a strain controllable shock loading design it was possible to separate and control independently strain and pressure. Thus enabling the ability to control the added heat from the deformation process undergoing compaction/consolidation of the powder. When the added heat of consolidation deformation exceeds the melt temperature of the 304 powders, a melt zone results that can consume large regions of the compact. It is within these regions that very high diffusion of gold into the powder occurs. These anomalous increases have been observed via optical microscopy, scanning electron microscopy and EDAX measurements. Values exceeding 1200 m/sec have been measured and correlated to the powder sizes, size distribution and packing density, concomitant with sample container strains ranging from 2.0% to 26%.

• Research Organization: Los Alamos National Laboratory
• Sponsoring Organization: DOE
• OSTI ID: 977464
• Report Number(s): LA-UR-04-0838; LA-UR-04-838
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CONTAINERS
DEFECTS
DEFORMATION
DESIGN
DIFFUSION
DISTRIBUTION
GEOMETRY
GOLD
IMPLOSIONS
OPTICAL MICROSCOPY
POROUS MATERIALS
PROCESSING
SAMPLE HOLDERS
SCANNING ELECTRON MICROSCOPY
STAINLESS STEELS
STRAINS
TRANSPORT