论文部分内容阅读
采用透射电镜 ( TEM)和维氏硬度计研究了回归再时效 ( RRA)处理对 70 50合金的的影响。研究发现 ,70 50合金受回归温度和时间影响。当回归温度为 453K和 473K时 ,回归曲线由三部分组成 ,回归再时效曲线由两部分组成。与在回归曲线上存在的峰值硬度相比 ,回归再时效峰值硬度要高。 TEM观察表明 ,硬度谷值的产生与 GP区的回溶有关 ,而峰值的产生与η′和η相的沉淀析出有关。回归再时效峰值高于回归峰值 ,这与回归再时效过程中 η和 η′相沉淀析出数目增加有关。当回归温度为 493K,回归和回归再时效曲线单调下降 ,分析认为由于回归温度高 ,回归曲线上不能区分 GP区的回溶、η和 η′相形核、η和 η′相长大及粗化这三个阶段
The effect of RRA treatment on 70 50 alloy was investigated by transmission electron microscopy (TEM) and Vickers hardness tester. The study found that the 7050 alloy by the regression temperature and time. When the regression temperature is 453K and 473K, the regression curve consists of three parts, the regression re-aging curve consists of two parts. The regression peak re-peak hardness is higher than the peak hardness existing on the regression curve. The TEM observation shows that the hardness valley is related to the GP solution, and the peak value is related to precipitation of η ’and η phase. The peak value of regression re-aging is higher than the peak value of regression, which is related to the increase of precipitates of η and η ’phase during the process of regression re-aging. When the regression temperature is 493K, the regression and regression re-curves decrease monotonically. It is considered that the regression curve can not distinguish between the solubilization of GP region, the nucleation of η and η ’, the growth and coarsening of η and η’ due to the high regression temperature These three stages