快速凝固Al-Fe合金的显微组织及其对性能的影响

Microstructure of Rapidly Solidified Al-Fe Alloy and It's Effect on Mechanical Properties

本文用分析电子显微术(AEM)和力学性能测试研究了快速凝固热强合金Al-Fe-(Ce、Ti、Zr)的显微组织及其对高温性能的影响。首先分析了急冷条带的凝固过程动力学及凝固速度对胞晶内部溶质分布的影响,之后对急冷条带及热挤合金的退火过程与弥散相分布时合金高温性能的作用进行了研究。分析结果表明:影响合金凝固过程的主要是初始过冷度和凝固速率;胞晶内溶质元素固溶量随凝固速度增大而升高。合金高温性能主要同弥散相的结构及分布有关。

An analytical electron microsopy and mechanical properties measurments study were conducted to examine the ralation between the microstructure of RS Al-Fe alloys and their elevated temperature mechanical properties. The solidification process of melt spun ribbons and the effect of growth rates on the microsegregation profiles in α-Al cells were investigated. Finally annealing behaviors of RS ribbons and extrasions were examined, and the effects of dispersive phases distribution on high temperature mechanical properties of extrusions were also discussed.