Tsau Chun-Huei, Tsai Meng-Chi, Wang Wei-Li
Institute of Nanomaterials, Chinese Culture University, Taipei 111, Taiwan.
Materials (Basel). 2022 Jan 24;15(3):888. doi: 10.3390/ma15030888.
FeCoNiMo and CrFeCoNiMo equimolar alloys were prepared by arc-melting. The microstructures of the as-cast alloys were examined by SEM, HREM and XRD; and a potentiodynamic polarization test of the as-cast alloys was undertaken to evaluate the corrosion resistance in the solutions. Results showed that both of FeCoNiMo and CrFeCoNiMo equimolar alloys had a dendritic structure. The dendrites of these two alloys were a single phase which was a simple cubic (SC) structure with large lattice constant; and the interdendrities of these two alloys had a dual-phased eutectic structure in which the phases were face-centered cubic (FCC) and simple cubic (SC). The hardness of CrFeCoNiMo alloy was higher than that of FeCoNiMo alloy. Additionally, the potentiodynamic polarization test showed that CrFeCoNiMo alloy was better than FeCoNiMo alloy in 1 M nitric acid and 1 M sodium chloride solutions. Adding chromium into FeCoNiMo alloy could increase corrosion resistance in these two solutions. All of the results indicated that the CrFeCoNiMo alloy surpassed FeCoNiMo alloy.
通过电弧熔炼制备了FeCoNiMo和CrFeCoNiMo等摩尔合金。利用扫描电子显微镜（SEM）、高分辨电子显微镜（HREM）和X射线衍射仪（XRD）对铸态合金的微观结构进行了检测；并对铸态合金进行了动电位极化测试，以评估其在溶液中的耐腐蚀性。结果表明，FeCoNiMo和CrFeCoNiMo等摩尔合金均具有树枝状结构。这两种合金的树枝晶为单相，是具有大晶格常数的简单立方（SC）结构；这两种合金的枝晶间具有双相共晶结构，其中的相为面心立方（FCC）和简单立方（SC）。CrFeCoNiMo合金的硬度高于FeCoNiMo合金。此外，动电位极化测试表明，在1 M硝酸和1 M氯化钠溶液中，CrFeCoNiMo合金比FeCoNiMo合金具有更好的耐腐蚀性。在FeCoNiMo合金中添加铬可提高其在这两种溶液中的耐腐蚀性。所有结果表明，CrFeCoNiMo合金优于FeCoNiMo合金。
