摘要
测定AlCoCrFeNi高熵合金高温氧化后的氧化动力学曲线,采用X射线衍射仪、扫描电镜和能谱仪等分析合金氧化层的物相、形貌、结构和成分,利用硬度计测定不同温度下氧化产物的硬度,从热力学和动力学角度深入分析AlCoCrFeNi高熵合金的氧化机理.结果表明:AlCoCrFeNi高熵合金在800~1000℃下具有较好的抗氧化性能,高于1000℃时合金退化较为明显;AlCoCrFeNi高熵合金800℃氧化时Al与O元素亲和力最大,并且高熵合金中Al原子扩散速率最大,Al率先在合金表面形成连续的Al_(2)O_(3)膜,随着温度的升高,其他原子也扩散至表面发生氧化反应,合金表面出现Cr_(2)O_(3)和尖晶石等,氧化物逐渐长大,1100℃时长大的尖晶石易从合金表面脱落;随着氧化温度的升高,AlCoCrFeNi高熵合金的显微硬度逐渐升高.
The oxidation kinetic curves are measured,and the physical phase,morphology,structure and composition of the oxidation layer of the alloy are analyzed by X-ray diffractometer,scanning electron microscope and energy spectrometer,etc.The hardness of the oxidation products at different temperatures is measured by hardness tester.The oxidation mechanism of AlCoCrFeNi high-entropy alloy is analyzed from the perspectives of thermodynamics and kinetics.The results show that the AlCoCrFeNi high-entropy alloy has good oxidation resistance from 800℃to 1000℃,but the degradation of the alloy is obvious above 1000℃.When the AlCoCrFeNi high-entropy alloy is oxidized at 800℃,the Al atoms who have the maximum diffusion rate in the alloy and have the maximum affinity with O take the lead to form a continuous Al_(2)O_(3)film on the surface of the alloy.As the temperature rises,other atoms diffuse to the surface and oxidation reactions occur,resulting in the appearance of Cr_(2)O_(3)and spinel on the surface of the alloy,and the oxides grow gradually.The spinel grows to the point where it is easily removed from the surface of the alloy at 1100℃.With the oxidation temperature rises,the microhardness of the alloy gradually increases.
作者
潘善钦
陈娟
肖金坤
PAN Shanqin;CHEN Juan;XIAO Jinkun(School of Mechanical Engineering,Yangzhou 225127;Testing Center,Yangzhou University,Yangzhou 225009,China)
出处
《扬州大学学报（自然科学版）》
CAS
北大核心
2023年第1期40-46,共7页
Journal of Yangzhou University：Natural Science Edition
基金
国家自然科学基金资助项目(51901203)
扬州大学“青蓝工程”资助项目。
作者简介
联系人:陈娟,E-mail:jchenyzu@yzu.edu.cn。
