论文部分内容阅读
采用电子背散射衍射(EBSD)技术分析后续热处理对轧制-ECA大应变纯铝微观结构及力学性能的影响。结果表明轧制-ECA加工后的纯铝以小角度晶界为主,随着退火温度的升高,小角度晶界所占比例减小,材料硬度先上升后下降,强度则持续下降。200℃以上温度的退火可以显著消除大应变加工后材料内部的拉长纤维组织;当退火温度超过300℃时,平均晶粒尺寸明显增大。
The effect of subsequent heat treatment on the microstructure and mechanical properties of rolled-ECA large strain pure aluminum was analyzed by electron backscatter diffraction (EBSD). The results show that the pure aluminum after rolling-ECA processing is mainly composed of small-angle grain boundaries. With the increase of annealing temperature, the proportion of small-angle grain boundaries decreases. The hardness of the material first increases and then decreases, while the strength decreases continuously. Annealing at a temperature above 200 ° C can significantly eliminate the elongated fiber structure in the material after the large strain processing. When the annealing temperature exceeds 300 ° C, the average grain size obviously increases.