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含Ti低活化FeCrV基中熵合金的铅铋腐蚀性能研究
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Abstract:
本研究采用电弧熔炼法制备了低活化且等原子比的FeCrV以及含Ti的FeCrVTi中熵合金，并对其相结构和铅铋腐蚀性能进行了研究。在相组成方面，表征结果显示FeCrV合金为BCC单相结构，FeCrVTi合金为BCC + Laves双相结构，同时表征结果与热力学参数经验标准的预测结果相互吻合，证实了利用热力学参数开发与设计合金的可行性。然后，耐铅铋腐蚀性能方面，结果发现由于Ti的加入，FeCrVTi合金的耐铅铋腐蚀性能与FeCrV合金相比并未得到提升，同时还有一定程度的腐蚀层脱落现象。最后，通过表面和截面分析合金的腐蚀机理，推断出FeCrV合金以氧化腐蚀为主，而FeCrVTi合金以BCC相的氧化腐蚀和Laves相的溶解腐蚀为主。本研究为铅冷快堆和ADS系统的耐铅铋腐蚀性和低活化性结构材料的开发提供了新的思路和观点。
In this study, reduced activation FeCrV and FeCrVTi medium-entropy alloys (MEAs) with equiatomic were prepared using arc melting. The phase structures and lead-bismuth eutectic (LBE) corrosion resistance of the MEAs were investigated. Structural characterization revealed that FeCrV MEA exhibited a single BCC phase, while FeCrVTi MEA exhibited a dual-phase structure comprising BCC and Laves phases. These results are consistent with predictions based on thermodynamic parameters, confirming the feasibility of using thermodynamic criteria for alloy design. In terms of LBE corrosion resistance, the addition of Ti did not enhance LBE corrosion resistance of FeCrVTi compared to FeCrV MEA. Moreover, there was evidence of some degree of corrosion layer detachment. Surface and cross-sectional analyses of the corrosion mechanism suggested that FeCrV MEA primarily undergoes oxidative corrosion, whereas FeCrVTi MEA is primarily subjected to oxidative corrosion in the BCC phase and dissolution corrosion in the Laves phase. This study provides new insights and perspectives for the development of LBE corrosion resistance and reduced activation structural materials for lead-cooled fast reactors and accelerator-driven systems (ADS).
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