用声发射研究Al Zn Mg Cu合金的锯齿流变

用声发射研究Al Zn Mg Cu合金的锯齿流变 A STUDY ON SERRATED FLOW OF A1 Zn Mg Cu BY ACOUSTIC EMISSION 徐约黄 Xu Yaohuang Huang Daiqian Wang Shaoling first-author 黄大千 王绍苓 用声发射研究了Al Zn Mg Cu合金刚淬火及淬火经短时间时效后的试样在拉伸过程中出现的锯齿流变现象。实验结果表明: （1）在出现锯齿流变现象的同时,出现声发射特征峰。 （2）声发射特征峰只是在达到某临界应变ε c （或临界应力σ c ）之后才出现。临界应力σ c 随淬火温度、时效温度及时效时间而变。 （3）在某一温度时效一定时间以后,声发射特征峰及锯齿流变现象同时消失,消失所需时间随淬火温度及时效温度而异。根据声发射特征峰的形貌及其产生与消失的规律对锯齿流变行为的机制进行了探讨。 The serrated flow in as-guenched and aged Al Zn Mg Cu alloy has been investigated by acoustic emission. The results are as follows. （1） There are characteritic acoustic emission peaks while the serrated flow occoured. （2） The characteristic acoustic emission peaks appear only after certain critical stress σ C （or critical strain ε C ）. The σ C （or ε C ） depends on quenching temperature, aging temperature, and aging time. （3） The characteristic acoustic emission peaks and serrated flow disappear simultaneously when the sample is aged for a certain time depending on the quenching temperature and aging temperature. The characteristic acoustic emission peak was analyzed and the menchanism of the serrated flow was discussed. 1983-04-01 2021-04-01 4