研究了退火、淬火状态下 Al-Mg 合金的晶界内耗。实验表明,随 Mg 含量的增加,晶界内耗峰的峰宽和弛豫强度单调下降,峰位开始移向高温,后又移向低温;高温淬火处理能压低 Al-2.4wt-%Mg的晶界峰,但对其它低 Mg 含量试样不敏感,一定温度的保温能使压低的晶界峰回升。 The grain boundary friction loss of Al-Mg alloy during annealing and quenching was studied. The experimental results show that with the increase of Mg content, the peak width and relaxation strength of the peak in the grain boundary decrease monotonously, the peak position begins to move to the high temperature and then to the low temperature. The high temperature quenching can lower the grain size of Al-2.4wt-% Mg However, it is insensitive to other samples with low Mg content. The thermal insulation at a certain temperature can make the depressed grain boundary peak rise.