衝撃固化成形したNb-Al系MA粉末の組織 Microstructure of Shock Consolidated Mechanically Alloyed Nb-Al Powders
The intermetallic compound Nb<SUB>3</SUB>Al has attracted much attention as a potential high temperature material because of its high melting point. In the present study, we have made shock-consolidation experiments on Nb-20at. %Al alloy powders, which is produced by mechanical alloying of elemental powders, with the use of a single-stage propellant gun as a function of projectile velocity in the range of 0.75-1.49km/s. The density of compacts increases with increasing projectile velocty and saturates to a value of 7.25 Mg/m<SUP>3</SUP> when the velocity exceeds 1.16km/s. X-ray diffraction analysis indicates that the compound Nb<SUB>3</SUB>Al is formed for projectile velocities greater than 1.16km/s. Very fine microstructures with grain size of 10-200nm as well as high hardness values are observed on compacts consolidated with these projectile velocities.
粉体および粉末冶金 44(2), 194-197, 1997-02-15
Japan Society of Powder and Powder Metallurgy