On grain boundary facetting under stress during high temperature deformation of Al and Al-Ga alloys

Aluminuim of high purity and aluminium with 50 ppm gallium were deformed under various strain rates and temperatures in order to investigate the possible influence of liquid like grain boundaries on grain boundary sliding and macroscopic deformation behaviour. Under all conditions, serrated grain boundaries were observed to develop during the tensile test. Those serrated structures were correlated to the development of subgrains observed by …