Volatilization of Mn in Cu-Al-Mn alloy during heat-treatment

Abstract

The microstructure of Cu-14.0wt%Al-7.5wt%Mn alloys after annealing at 900℃ for different time was investigated by means of chemical composition analysis,SEM,optical microscope(OM) and X-ray diffraction.The electrical resistance and hardness of the alloy were measured.The results show that volatilization of Mn from the alloy increases with increasing the time of heat treatment,which results in the decreasing of M_s temperature of the alloy.So the amount of Mn in Cu-Al-Mn alloy can be adjusted by volatilization of Mn during heat-treatment and then M_s temperature of the alloy is controlled exactly.