Shock consolidation of AlLi alloy powders

TLDR: In this article, several rapidly solidified Al-Li-based alloy powders were successfully consolidated into crack-free compacts by explosively generated shock waves, and the microstructures of the compacts were evaluated by optical and electron microscopy.

Abstract: Several rapidly solidified AlLi-based alloy powders were successfully consolidated into crack-free compacts by explosively generated shock waves. Both flyer plate and direct contact techniques were applied in cylindrical and plate configurations. Densities of the compacted powders reach over 97% of their theoretical values. The microstructures of the compacts were evaluated by optical and electron microscopy. Crack-free compacts were produced by using the flyer tube technique in the cylindrical separated by random stacking faults or several atomic layers of f.c.c. structure. A high density of hot-extruded alloys. Compacts of Al3wt.%Li1wt.%Cu1wt.%Mg0.2wt.%Zr alloy powders exhibited the highest tensile strength (282 MPa). The optical micrographs showed that the crack-free compacts had considerable interparticle melting. The interparticle melting regions were analyzed by X-ray diffraction and transmission electron microscopy and had a microcrystalline structure with precipitates of δ′-Al 3 Li and δ-AlLi. Fractographs of tensile specimens revealed that the compacts having high tensile strength had strong interparticle bonding; their rupture surface exhibited transparticle fracture.