Age hardening response of a Mg-5Â wt.%Sc alloy under an applied stress field

► Stress aging method changes the precipitate morphology during the age process. ► Tensile strength of Mg-Sc alloys was improved by stress aging approach. ► Spherical precipitate formed by eliminating the deference of oriented growth force. ► Stress aging Mg-Sc alloy can not sacrifice the elongation.