Suppression of samson phase formation in Al—Mg alloys by boron addition

A method of suppressing the Samson phase, Al3Mg2, at grain boundaries in aluminum, comprising:

• providing aluminum in a container;
• adding boron to the container;
• providing an inert atmosphere;
• arc-melting the aluminum and the boron;
• mixing the aluminum and the boron in the container to form an alloy mixture;
• wherein the aluminum is Al-5083 or Al-5456 and wherein the boron reduces supersaturation of magnesium;
• wherein the boron traps the magnesium in a solid solution as AlMgB2 phase;
• further comprising the steps of
• adding copper to the container prior to the step of providing the inert atmosphere;
• arc-melting the aluminum and the boron and the copper;
• mixing and homogenizing the aluminum, the boron and the copper in the container to form an alloy mixture;
• wherein the step of mixing and homogenizing is at 500° C. for 2 hours;
• and
• annealing at 150° C. for about 190 hours.