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研究了真空电弧熔炼AlFeCrCoCu多组元高熵合金的组织结构及其在900、1 000、1 100、1 200℃下的高温氧化性能和硬度。研究表明,AlFeCrCoCu合金为典型的枝晶结构,合金成分偏析严重,Cu富集在晶间形成FCC相。合金熔点为1 380℃左右,1 050℃左右晶间富Cu相开始熔化。合金具有很强的抗高温氧化能力,加热到800℃左右质量几乎保持不变。氧化实验结果表明,合金在晶间富Cu相熔点(1 050℃)以下具有很强的抗氧化能力,而在此温度以上合金表面氧化较为严重。合金氧化表面的XRD和EDS分析结果表明,合金在高温氧化过程中生成了一层Al2O3薄膜,阻止了合金的进一步氧化。此外,合金具有较强的硬度,且于1 100℃和1 200℃氧化后的合金硬度高于铸态合金。
The microstructure and microstructure of AlFeCrCoCu multi-component high-entropy alloy in vacuum arc melting were investigated and their high-temperature oxidation properties and hardness at 900, 1000, 100 and 200 ℃ were investigated. The results show that the AlFeCrCoCu alloy is a typical dendritic structure. The composition of the alloy is segregated severely, and Cu is enriched in the intercrystalline FCC phase. The melting point of the alloy is about 1 380 ℃, and the Cu-rich phase around the 1050 ℃ begins to melt. Alloy has a strong resistance to high temperature oxidation, heating to about 800 ℃ quality almost unchanged. The results of oxidation experiments show that the alloy has strong oxidation resistance under the melting point (1050 ℃) of the Cu-rich phase in the intergranular phase, and the oxidation of the alloy surface is more severe at this temperature. The results of XRD and EDS analysis of the surface of the alloy showed that the alloy formed a layer of Al2O3 film during the high temperature oxidation and prevented the further oxidation of the alloy. In addition, the alloy has a stronger hardness, and the hardness of the alloy after being oxidized at 1 100 ° C and 1 200 ° C is higher than that of the as-cast alloy.