Preparation and properties of w(Al) alloy powders

Abstract

In order to improve the density and penetrating ability of Al/Ni energetic structural materials, W with the high density and hardness generally was introduced. But the oxidation reaction of W factually is difficult to induce because of the strong binding energy. It then results in the great reduce of energy release. In this work, W(Al) super-saturated solid solution powders with the average particle size of 3.9μm, were synthesized by mechanical alloying. In this super-saturated solid solution, Al atoms are evenly distributed in the W lattice and Al content can reach 80 at.%. Moreover, Al is still stable in the lattice of W but not form Al-W intermetallic, when W(Al) powders were annealed at 1200°C for 30 min in vacuum. As a large amount of Al atoms into W, the activity of W is greatly improved, thus the combustion heat of W(Al) super-saturated solid solution powders can reach about 11.3KJ/g.