Al含量变化对CoNiCrAlYRe合金氧化行为的影响

Influences of Al Content on Oxidation Behavior of CoNiCrAlYRe Alloys

摘要:

利用X射线衍射仪、扫描电镜和能谱分析研究不同铝含量的CoNiCrAlYRe合金在1000 ℃空气中的恒温氧化行为。结果表明：铝含量的增加促进了合金中富Cr相在γ、β相界面处的析出；铝含量的增加显著抑制了尖晶石氧化物的形成；高铝含量合金中存在的富Cr层有利于致密氧化膜的形成，从而降低了氧化速率，提高了合金的抗氧化性能

Abstract:

Isothermal oxidation behavior of CoNiCrAlYRe alloys with different aluminum content at 1000 oC in air was investigated by X-ray diffraction, scanning electron microscopy and energy dispersive X-ray spectroscopy analysis. The results show that increasing of the aluminum content induces the Cr-rich phase to precipitate at the γ/β interfaces. The formation of the spinel oxide scales is significantly suppressed by the increase of the aluminum content. The existence of the Cr-rich layer is beneficial for the formation of a compact oxide layer of the alloy with high aluminum content, which lowers the oxidation rate and improves oxidation resistance