时效对LC9铝合金范性流变阶段声发射第二峰的影响

时效对LC9铝合金范性流变阶段声发射第二峰的影响 THE EFFECT OF AGING ON THE SECOND ACOUSTIC EMISSION PEAK IN LC9 ALUMINUM ALLOY DURING PLASTIC FLOW 邹忠 Zou Zhong 1 2 first-author 杜凤牡 Du Fengmu 1 2 徐约黄 Xu Yuehuang 1 2 武汉大学物理学系 武汉大学物理学系 Department of Physics Wuhan University Department of Physics Wuhan University 武汉大学物理学系,武汉,430072 武汉大学物理学系,武汉,430072 系统研究了LC9铝合金范性流变过程声发射第二峰高度与热处理制度的关系。在一定时效温度下,欠时效阶段声发射第二峰随时效延长而升高;时效强化阶段第二峰最高;过时效阶段随时效程度加深峰下降。时效温度愈高,第二峰高达极大值愈早。用位错的变速运动对以上现象进行了解释。 The relation between the height of the second acoustic emission peak （N ） in LC9 aluminum alloy during plastic flow and the aging time under different temperatures were investigated systematically. For a certain aging temperature T,the Nl increases to a maxi-mum and then decreases with aging. The time of Nl reaching to the maximum is close to that of σB. These results are explained in terms of the accelaration motion of disloctions. 声发射 时效 铝合金 位错 acoustic emission age aluminum alloy dislocation TG156.92 1994-05-01 2021-04-01 5