SHOCK REACTIVE SYNTHESIS OF REFRACTORY-METAL ALUMINIDES FROM A MECHANICALLY ALLOYED PRECURSOR

New shock reactive processing is proposed to make direct synthesis of refractory metal aluminides from the constituent elemental powders. Fo r the Ni-Al system, the blended and compacted disc specimen with the s pecified porosity was shot by the planar shock wave to investigate the effect of shock wave velocity on the shock induced reactions. In part icular, by using the mechanically alloyed precursor, the limit shock v elocity to ignite the reaction can be reduced by 100 m/s. Furthermore, the induced lattice defects by the mechanical alloying is kept and en hanced by this shock reactive synthesis. Hence, the mechanically alloy ed precursor must be effective to realize the near-net dense and solid -state synthesis from the elemental powders to the final aluminides wi th the induced microstructures left inside.