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

作　　者：兰昊[1] 杨志刚[1] 张玉朵[1] 张弛[1] 

机构地区：[1]清华大学新型陶瓷与精细工艺国家重点实验室,北京100084

出　　处：《稀有金属材料与工程》2011年第1期85-89,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50871059);教育部留学中心留学回国基金(20070003006)

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。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.

关 键 词：AL CoNiCrAlYRe合金 氧化行为 

分 类 号：TG174.4[金属学及工艺—金属表面处理]