CrMnFeNi高熵合金在熔融FLiBe盐中的腐蚀与热稳定性

Corrosion and Thermal Stability of CrMnFeNi High Entropy Alloy in Molten FLiBe Salt.

作者信息

Elbakhshwan Mohamed, Doniger William, Falconer Cody, Moorehead Michael, Parkin Calvin, Zhang Chuan, Sridharan Kumar, Couet Adrien

机构信息

Engineering Physics Department, University of Wisconsin Madison, Madison, WI, USA.

Material Science and Engineering Department, University of Wisconsin Madison, Madison, WI, USA.

出版信息

Sci Rep. 2019 Dec 12;9(1):18993. doi: 10.1038/s41598-019-55653-2.

DOI:10.1038/s41598-019-55653-2

PMID:31831873

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6908586/

Abstract

The corrosion behavior of the FCC CrMnFeNi high entropy alloy (HEA) after exposure to molten FLiBe salt at 700 °C for 1000 hours, has been investigated. Results show that the HEA lost a higher mass compared to the reference 316 H stainless steel due to the dissolution of Mn into the molten salt. The loss of Mn from the alloy appeared to discourage the dissolution of Cr in the molten fluoride salts which is widely recognized as the mechanism of corrosion degradation. Thermal exposure at 700 °C for 1000 hours also led to the precipitation of an additional BCC phase CrFeMnNi, which was confirmed by CALPHAD predictions.

摘要

研究了面心立方结构的CrMnFeNi高熵合金（HEA）在700°C下暴露于熔融FLiBe盐中1000小时后的腐蚀行为。结果表明，由于Mn溶解到熔盐中，与参考316H不锈钢相比，高熵合金的质量损失更高。合金中Mn的损失似乎抑制了Cr在熔融氟化物盐中的溶解，这是被广泛认可的腐蚀降解机制。在700°C下热暴露1000小时还导致了额外的体心立方相CrFeMnNi的析出，这已通过相图计算热力学（CALPHAD）预测得到证实。