Solid-state cold spraying of FeCoCrNiMn high-entropy alloy:an insight into microstructure evolution and oxidation behavior at 700-900℃
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2021年第9期
论文作者：Yaxin Xu Wenya Li Longzhen Qu Xiawei Yang Bo Song Rocco Lupoi Shuo Yin
文章页码：172 - 183
摘 要：About 3 mm thick five-element equimolar high-entropy alloy（HEA） FeCoCrNiMn was successfully deposited by solid-state cold spraying（CS）.The high-temperature oxidation behavior of the CSed HEA was investigated at 700-900℃.Heat treatment was performed on the CSed HEA before oxidation to heal the incomplete interfaces between the deposited particles.Results show that the microstructure of the CSed HEA is characterized by grain refinement and abundant interparticle incomplete interfaces.Post-spray heat treatment promotes recrystallization and grain growth in the CSed HEA.After oxidation testing,the oxide scales are composed of multi-layers:a Mn2 O3（or Mn3 O4） outer layer,a Mn-Cr spinel intermediate layer and a Cr2 O3 inner layer.The CSed HEA exhibits higher parabolic rate constants and more favorable internal oxidation than the bulk HEAs that have similar compositions in the literature.Such a discrepancy becomes pronounced at higher temperatures.The grain refinement and numerous particle boundaries are responsible for such a distinctive performance of the CSed HEA.
Yaxin Xu1，Wenya Li1，Longzhen Qu1，Xiawei Yang1，Bo Song2，Rocco Lupoi3，Shuo Yin3
1. State Key Laboratory of Solidification Processing, Shanxi Key Laboratory of Friction Welding Technologies, Northwestern Polytechnical University2. State Key Laboratory of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology3. Trinity College Dublin, The University of Dublin, Department of Mechanical and Manufacturing Engineering
摘 要：About 3 mm thick five-element equimolar high-entropy alloy（HEA） FeCoCrNiMn was successfully deposited by solid-state cold spraying（CS）.The high-temperature oxidation behavior of the CSed HEA was investigated at 700-900℃.Heat treatment was performed on the CSed HEA before oxidation to heal the incomplete interfaces between the deposited particles.Results show that the microstructure of the CSed HEA is characterized by grain refinement and abundant interparticle incomplete interfaces.Post-spray heat treatment promotes recrystallization and grain growth in the CSed HEA.After oxidation testing,the oxide scales are composed of multi-layers:a Mn2 O3（or Mn3 O4） outer layer,a Mn-Cr spinel intermediate layer and a Cr2 O3 inner layer.The CSed HEA exhibits higher parabolic rate constants and more favorable internal oxidation than the bulk HEAs that have similar compositions in the literature.Such a discrepancy becomes pronounced at higher temperatures.The grain refinement and numerous particle boundaries are responsible for such a distinctive performance of the CSed HEA.
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