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采用热模拟系统研究半固态变形参数对合金微观组织演变和元素分布的影响,并讨论变形过程中的Ti2Cu析出行为。结果表明:微观组织,特别是Ti2Cu析出过程受变形参数影响较大;温度的增加,应变速率和变形量的降低将促进Ti2Cu在晶界的偏析,最终形成了网状晶界结构。分析认为:半固态晶界的析出过程主要受控于包晶反应,升温或降低其他变形参数将有利于液相在晶界的析出,形成晶界Cu元素富集区。液相的偏析和Cu元素的富集增加了该区域的包晶反应,最终在冷却过程中形成了粗大的网状晶界结构。
The influence of the semi-solid deformation parameters on the microstructure evolution and elemental distribution of the alloy was studied by the thermal simulation system. The precipitation behavior of Ti2Cu in the deformation process was also discussed. The results show that the microstructure, especially the precipitation of Ti2Cu, is greatly influenced by the deformation parameters. The increase of temperature, the decrease of strain rate and the deformation will promote the segregation of Ti2Cu at the grain boundaries and finally form the reticular grain boundary structure. The analysis shows that the precipitation process of the semi-solid grain boundary is mainly controlled by the peritectic reaction, and the temperature increase or decrease of other deformation parameters will facilitate the precipitation of the liquid phase at the grain boundary and form the Cu-rich zone in the grain boundary. The segregation of the liquid phase and the enrichment of Cu elements increase the peritectic reaction in this region and eventually form a coarse reticular grain boundary structure during cooling.