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首页> 外文期刊>Applied Surface Science >Wear resistance of FeCoCrNiMnAl_x high-entropy alloy coatings at high temperature
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Wear resistance of FeCoCrNiMnAl_x high-entropy alloy coatings at high temperature

机译：FeCoCrNiMnAl_x高熵合金涂层的高温耐磨性

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摘要

The FeCoCrNiMnAlx high-entropy alloy (HEA) coatings were produced on 4Cr5MoSiV steel by laser cladding, which can improve the high temperature oxidation resistance and wear resistance of the substrate steel in its service environment. The effects of Al addition on the microstructure and properties of the coatings were systematically investigated. The addition of Al element promoted the transition of FCC to FCC + BCC (B2) phases in the cladding layer and also refined the grains. Thereby, with the Al addition from 0 to 0.75, the micro-hardness and room-temperature wear weight loss of the HEA coatings increased and decreased, respectively, i.e. from 224.4 HV0.5 and to 344.2 HV0.5 and from 6.0 mg to 1.1 mg, compared with those of the base metal (227.1 HV0.5 and 10.5 mg) In the high-temperature oxidation process, fine and dense alpha-Al2O3 was preferentially generated because of its lowest absolute Gibbs free energy compared to the other oxides. The generation of alpha-Fe2O3 and Cr2O3 also promoted the heterogeneous nucleation of alpha-Al2O3. The high-temperature oxidation weight gain and wear weight loss of the FeCoCrNiMnAl0.75 cladding layer was approximately 58% and 17% of those of the base metal, respectively, and the wear mechanism was mainly abrasive wear.
机译：通过激光熔覆在4Cr5MoSiV钢上制备FeCoCrNiMnAlx高熵合金（HEA）涂层，可以改善其在使用环境中的高温抗氧化性和耐磨性。系统地研究了铝的添加对涂层的微观结构和性能的影响。 Al元素的添加促进了包层中FCC向FCC + BCC（B2）相的转变，并且还细化了晶粒。因此，随着Al的添加从0到0.75，HEA涂层的显微硬度和室温磨损失重分别增加和减少，即从224.4 HV0.5和344.2 HV0.5以及从6.0 mg到1.1与贱金属（227.1 HV0.5和10.5 mg）相比，在高温氧化过程中，优先生成细密致密的α-Al2O3，因为与其他氧化物相比，其绝对吉布斯自由能最低。 α-Fe2O3和Cr2O3的产生也促进了α-Al2O3的异质成核。 FeCoCrNiMnAl0.75包覆层的高温氧化增重和磨损失重分别约为贱金属的58％和17％，磨损机理主要是磨料磨损。

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