Enhanced oxidation resistance of MoTaTiCrAl high entropy alloys by removal of Al

作     者：Li-Chao Li Ming-Xing Li Ming Liu Bo-Yang Sun Chao Wang Jun-Tao Huo Wei-Hua Wang Yan-Hui Liu 李力超;李明星;刘明;孙博阳;王超;霍军涛;汪卫华;柳延辉

作者机构：Institute of PhysicsChinese Academy of SciencesBeijing100190China School of Physical ScienceUniversity of Chinese Academy of SciencesBeijing100049China Songshan Lake Materials LaboratoryDongguan523808China Beijing Advanced Innovation Center for Materials Genome EngineeringUniversity of Science and Technology BeijingBeijing100083China Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of SciencesBeijing100049China Qian Xuesen Laboratory of Space TechnologyBeijing100094China Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo315201China 

出 版 物：《Science China Materials》 (中国科学（材料科学（英文版）)

年 卷 期：2021年第64卷第1期

页      面：223-231页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：supported by the National Key Research and Development Program of China (2018YFA0703600) the National Science Fund for Distinguished Young Scholars (51825104) the Key Research Program of Frontier Sciences of Chinese Academy of Sciences (QYZDY-SSW-JSC017) the Strategic Priority Research Program of Chinese Academy of Sciences (XDB30000000) the Key Basic and Applied Research Program of Guangdong Province, China (2019B030302010) the National Natural Science Foundation of China (11790291 and 61888102) 

主　　题：high-entropy alloy oxidation resistance MoTaTiCr high-temperature application 

摘      要：Refractory high-entropy alloys(HEAs) exhibit remarkable mechanical properties desired for high-temperature applications. However, their oxidation resistance at high temperatures received less attention. Recent work indicates that MoTaTiCrAl alloy exhibits excellent oxidation resistance,but the effects of Al and Cr remain unclear. In this work, we demonstrate that the addition of Al is unnecessary for preventing oxidation of the MoTaTiCrAl alloy and the removal of Al leads to a more oxidation resistant MoTaTiCr medium entropy alloy. Structural and chemical analyses indicate that the excellent oxidation resistance of MoTaTiCr is mainly associated with the formation of continuous CrTaO4 oxide *** results indicate that complex oxides can be adopted as effective candidates for enhancement of oxidation resistance,in addition to typical strategy of forming Al2O3, Cr2O3 or SiO2 barrier layer.