过热处理对Al-1.1%Fe合金固态组织的影响

Influence of Overheating Treatment on the Solid Structure of Al-1.1%Fe Alloy

采用差示扫描量热分析仪(DSC),将Al-1.1%Fe合金熔体过热至液相线以上不同温度进行冷却,研究其凝固时过冷度及固态组织中FeAl3相尺寸的变化,发现过冷度及固态组织中FeAl3相尺寸随熔体过热温度的提高而变化的曲线在某一高温(约900℃)时存在明显转折,低于900℃,随着过热温度的提高,其过冷度急剧增大,固态组织中FeAl3相显著细化,而高于这一温度后,上述变化则非常缓慢。

Al-1.1%Fe melts were overheated several hundred temperatures above its liquidus line before its solidification by means of DSC instrument. The influence of undercooling degree on the FeAl3 phase in the solid structure was explored and the finding indicates that undercooling degree, the size of FeAl3 phase change with the overheating temperature. Obviously, an inflexion occurs at the temperature of 900 ℃. The undercooling degree increases sharply as the overheating temperature is increased below 900 ℃, accompanied with the remarkable refinement of FeAl3 phase; while the transformation mentioned above is not so notable above 900 ℃.