钼添加剂对(CoCrFeNi)Mo高熵合金腐蚀行为的影响

Effect of Molybdenum Additives on Corrosion Behavior of (CoCrFeNi)Mo High-Entropy Alloys.

作者信息

Wang Wenrui, Wang Jieqian, Yi Honggang, Qi Wu, Peng Qing

机构信息

School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China.

Nuclear Engineering and Radiological Sciences, University of Michigan, Ann Arbor, MI 48109, USA.

出版信息

Entropy (Basel). 2018 Nov 28;20(12):908. doi: 10.3390/e20120908.

DOI:10.3390/e20120908

PMID:33266632

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7512493/

Abstract

The present work investigates the influence of micro-alloyed Mo on the corrosion behavior of (CoCrFeNi)Mo high-entropy alloys. All of the (CoCrFeNi)Mo alloys exhibit a single face-centered cubic (FCC) solid solution. However, the (CoCrFeNi)Mo alloy exhibits an ordered sigma () phase enriched in Cr and Mo. With the increase of (the Mo content) from 1 to 3, the hardness of the (CoCrFeNi)Mo alloys increases from 124.8 to 133.6 Vickers hardness (HV), and the compressive yield strength increases from 113.6 MPa to 141.1 MPa, without fracture under about a 60% compressive strain. The potentiodynamic polarization curve in a 3.5% NaCl solution indicates that the addition of Mo has a beneficial effect on the corrosion resistance to some certain extent, opposed to the phase. Furthermore, the alloys tend to form a passivation film in the 0.5 M HSO solution in order to inhibit the progress of the corrosion reaction as the Mo content increases.

摘要

本研究探讨了微合金化Mo对(CoCrFeNi)Mo高熵合金腐蚀行为的影响。所有(CoCrFeNi)Mo合金均呈现单一的面心立方(FCC)固溶体。然而，(CoCrFeNi)Mo合金呈现出富含Cr和Mo的有序西格玛(σ)相。随着Mo含量从1增加到3，(CoCrFeNi)Mo合金的硬度从124.8维氏硬度(HV)增加到133.6 HV，压缩屈服强度从113.6 MPa增加到141.1 MPa，在约60%的压缩应变下无断裂。在3.5% NaCl溶液中的动电位极化曲线表明，与σ相相反，Mo的添加在一定程度上对耐蚀性有有益影响。此外，随着Mo含量的增加，合金在0.5 M H₂SO₄溶液中倾向于形成钝化膜以抑制腐蚀反应的进行。