摘要
该文介绍了一种超级抗氧化以及抗剥落的AlCoCrFeNiYHf高熵合金.与传统NiCoCrAlY合金相比,该合金表现出极其慢的氧化速率,其氧化速率常数(2.32×10-13 g 2 cm-4 s-1)下降超过一个数量级.氧化膜主要由α-Al 2O 3及少量偏析在α-Al 2O 3晶界处的活性元素氧化物构成.平滑且干净的氧化膜与基体有良好的界面结合.总而言之,极低的氧化膜生长速率和优异的界面结合使得AlCoCrFeNiYHf高熵合金具有优异的抗剥落性能.
In this study,we report a type of ultra oxidation and spallation resistant AlCoCrFeNiYHf high-entropy alloy(HEA).The alloy exhibits a significantly lower oxidation rate at 1100℃with a k p value of about 2.32×10-13 g 2 cm-4 s-1,which is one magnitude lower than those of the conventional NiCoCrAlY alloys.The oxide scale formed on the HEA predominantly consists ofα-Al 2O 3 with minor quantity of reactive elements oxides atα-Al 2O 3grain boundaries.The smooth and clean oxide/substrate interface ensures a strong interfacial bonding.Both the slow oxidation rate and the good interfacial adhesion contribute to the superior spallation resistance.
作者
张晗
陆杰
赵晓峰
ZHANG Han;LU Jie;ZHAO Xiao-feng(Shanghai Key Laboratory of Advanced High-Temperature Materials and Precision Forming,School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240 China)
出处
《湘潭大学学报（自然科学版）》
CAS
2019年第6期122-128,共7页
Journal of Xiangtan University(Natural Science Edition)
基金
国家自然科学基金项目(51971139)
关键词
高熵合金
氧化
剥落
氧化铝
高温
high-entropy alloy
oxidation
spallation
alumina
high temperature
