自从Gayler的试验研究以来,人们已经知道,自然时效的铝合金在经一短时间加热后将会或多或少地引起强度明显下降.这种影响被当作回归现象,至今从金属学的观点首先就AlCuMg合金积极观察研究.一般情况下,这种研究被当作认识组织状态和时效强化机理的补助方法.但是,热处理数据资料在这些研究工作中却相当不一致,并且对于回归时出现的强度减低的工艺使用中(例如变形过程)也仅有限地受到应用.这方面的主要原因在于 Since the experimental study by Gayler, it has been known that natural aging aluminum alloys will cause a more or less pronounced decrease in strength after heating for a short period of time, and this effect is regarded as a regression phenomenon, so far from the perspective of metallurgy In the first place, AlCuMg alloys are actively observed, and in general, they are used as a subsidy to recognize the state of the tissue and the mechanism of aging strengthening. However, the heat treatment data are quite inconsistent in these studies and the intensity of regression Reduced process usage, such as deformation processes, is also limited for a limited time. The main reason for this is that