Metallic glass/light alloy (MEGA) multimaterials elaborated by co-pressing at high temperature

Metallic glass/light alloy (MEGA) multilayered materials are elaborated by co-pressing at high temperature. They constitute a layer of Zr-based bulk metallic glass inserted between two layers of either aluminium or magnesium alloys. The co-pressing tests are performed at various temperatures above the glass transition temperature of the glass under inert gas. The selected conditions for co-pressing are chosen from the knowledge of the rheological behaviour (deduced from strain rate jump tests) of both the metallic glass and the light alloys and also from information concerning the thermal stability of the glass. It is shown that the bonding between the metallic glass and the light alloys is improved by increasing the strain undergone by the glass during the process. Bonding is also improved by increasing co-pressing temperature, keeping in mind that the amorphous structure of the glass must also be preserved during the process.