Shock compaction of rapidly solidified nickel based Mo--Al--W alloy powders with pressure up to 1. 2 mbar

Conference · Fri Jan 01 04:00:00 EST 1988

OSTI ID:7092741

Staudhammer, K P

The alloy described in this paper is a high strength nickel alloy containing 10 wt% Mo, 6.8 wt% Al, and 6 wt% W. It cannot be easily prepared by conventional casting methods without gross segregation occurring in the form of massive dendrites. Gas atomization to form fine powders reduces the dendrite size and therefore, the segregation. The spacing of the secondary dendrite arm has been used to estimate the cooling rate of this powder. The experimental investigation of shock compaction is based in part on mach stem lens formation work. One of the fortuitous aspects of the cylindrical explosion design is its suitability as a screening tool with its very high success rate of recovery. Use of the radial implosion design has allowed for the determination of optimum pressures required for consolidation of RSR Ni--10Mo--6.8Al--6W alloy powders as a function of initial packing density. These sets of experiments are in line with previous work on other shock consolidated powders showed that an increase of initial density decreased the melt zone, and only required a slight increase in the pressure to consolidate. 4 refs., 8 figs.

• Research Organization: Los Alamos National Lab., NM (USA)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 7092741
• Report Number(s): LA-UR-88-1184; CONF-881060-1; ON: DE88009144
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101* -- Metals & Alloys-- Preparation & Fabrication
360102 -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
ALUMINIUM ALLOYS
COMPACTING
CRYSTAL STRUCTURE
ELECTRON MICROSCOPY
EXPLOSIONS
GRAIN GROWTH
GRAIN SIZE
MICROSCOPY
MICROSTRUCTURE
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NICKEL BASE ALLOYS
PHASE TRANSFORMATIONS
POWDERS
SCANNING ELECTRON MICROSCOPY
SHOCK WAVES
SIZE
SOLIDIFICATION
TUNGSTEN ALLOYS