Effects of Al Addition on Microstructure and Electrochemical Property of FeCoCrNiMn High-Entropy Alloy in Different Treatment States
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摘要: 采用真空熔炼技术制备了FeCoCrNiMn和Al0.3FeCoCrNiMn高熵合金，并依次进行了1 150℃×6 h均匀化处理（固溶态），室温大变形轧制及800℃×1 h退火处理（轧制退火态），研究了其固溶态和轧制退火态的显微组织及在室温0.5 mol·L-1 H2SO4溶液中的电化学性能。结果表明：固溶态2种高熵合金均由面心立方单相组成；经大变形轧制及退火处理后，FeCoCrNiMn高熵合金仍为面心立方单相组织，其晶粒尺寸细化到4.57 μm，铝的添加使合金中生成了大量富铬σ相及贫铬体心立方相，且晶粒尺寸细化到小于500 nm；不同处理态下2种高熵合金在H2SO4溶液中均出现了钝化区，铝的添加降低了FeCoCrNiMn合金的耐腐蚀性能。
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关键词:
- FeCoCrNiMn高熵合金 /
- 铝 /
- 晶粒细化 /
- 显微组织 /
- 电化学性能
Abstract: FeCoCrNiMn and Al0.3FeCoCrNiMn high-entropy alloys were prepared by vacuum melting technique, and then subjected to homogenization treatment at 1 150℃ for 6 h (solid solution state) and severe rolling at room temperature followed by annealing at 800℃ for 1 h (rolled and annealed state). The microstructure and the electrochemical property in 0.5 mol·L-1 H2SO4 solution at room temperature of the alloys in solid solution state and in rolled and annealed state were studied. The results show that the two high-entropy alloys in solid solution state were both composed of single face-centered cubic phase. After severe rolling and annealing treatment, FeCoCrNiMn high-entropy alloy was still composed of single face-centered cubic phase, and the grains were refined to 4.57 μm; with the addition of Al, a large amount of σ phase (Cr-rich) and body-centerd cubic phase (Cr-depleted) precipitated in the alloy, and the grains were refined to lower than 500 nm. In the H2SO4 solution, the two high-entropy alloys in different treatment states possessed a passive region, and the addition of Al decreased corrosion resistance of the FeCoCrNiMn alloy. -
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