In this paper,the variations in the oxidation products on the surface of a Fe40Ni11Mn35Al7Cr6C1 (mole fraction,％) high entropy alloy and its effects on photothermal conversion performance were studied by adjusting oxidation temperature and surface roughness using economical in situ oxidation and selective etching techniques.The results show that,in the range of 500-700 ℃,as temperature and initial surface roughness increase,the oxide size,oxide thickness,roughness and oxide species on the alloy surface after oxidation exhibit an increasing trend,and the photothermal conversion performance gradually improves.After pre-etching and oxidation at 700 ℃ for 2 h,the solar energy absorptance and photothermal conversion efficiency of the alloy reach the peak values of 90.4％ and 87.9％,respectively.When the oxidation temperature continues to rise to 800 ℃,thermal stress that is increased due to the mismatch of thermal expansion coefficients,causes the oxide layer generated on the alloy's surface before and after etching to begin flaking off extensively,leading to a decline in the photothermal conversion performance of materials.This study provides theoretical support for the effective design of metal oxide layers,and helps to optimize and improve the photothermal performance of high entropy alloys.
high entropy alloyin situ oxidationselective etchingphotothermal conversionsolar selective absorber
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