摘要
采用真空悬浮熔炼法制备CoCrFeMnNiN_x(x=0,0.05,0.1)高熵合金,利用扫描电镜(SEM)、能谱仪(EDS)和X射线衍射仪(XRD)对700~1000℃高温氧化后合金氧化层形貌、成分和结构进行了分析,研究N元素对CoCrFeMnNi高熵合金抗氧化性能的影响。结果表明:在700℃和800℃下,合金的氧化层以Mn_2O_3为主;在900℃下,氧化层以Mn_3O_4为主;在1000℃下,合金的氧化层则主要是Cr_2O_3,这是由于合金在该温度下,表面含Mn氧化物易剥落,从而导致过渡层上含Cr的氧化物裸露于表面。700~1000℃氧化CoCrFeMnNiNx高熵合金均可评定为完全抗氧化级,且该合金体系的抗高温氧化性能随含N量的增加而提高。
CoCrFeMnNi high-entropy alloys （HEAs） with different N contents were prepared by vacuum levitation melting and then oxidized at 700-1000℃ , the morphology and microstructures of those oxide layers were characterized by using scanning electron microscopy （SEM） with energy dispersive spectrometer （EDS） and X-ray diffractometer （XRD）. The effects of N addition on the oxidation behavior of the HEAs were investigated. The experimental results show that the oxide is are mainly composed by Mn2 03 at 700 ℃ and 800℃ and by Mn3 04 at 900 ℃ while Cr203 is dominant at 1000 ℃. It is attributed to an easy peeling of outer Mn oxide layer and thus to an exposure of the inner Cr oxide layer at 1000 ℃. The CoCrFeMnNiNx alloys belong to a level of completely antioxidant at 700-1000 ℃ and the oxidation resistance of the HEAs can be improved with an increase in N content.
出处
《金属热处理》
CAS
CSCD
北大核心
2017年第12期71-77,共7页
Heat Treatment of Metals
基金
福建省高校产学合作重大项目(2014H6005)
福建省科技厅项目(2015H0008)
