Study on microstructure and corrosion resistance of CoCrFeNiCuTix high-entropy alloy
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摘要: 采用真空热压烧结法制备了CoCrFeNiCuTix (x为摩尔比, x=0.25, 0.50, 0.75, 1.00)六元高熵合金, 研究了Ti含量对该高熵合金微观组织和耐腐蚀性的影响。利用金相显微镜、X射线衍射仪、扫描电子显微镜、HVS-1000B型数显显微硬度计和电化学工作站等设备测试和分析了CoCrFeNiCuTix高熵合金的组织结构和耐腐蚀性能。结果表明: 不同Ti含量(摩尔分数)的CoCrFeNiCuTix高熵合金, 物相都为面心立方结构, 组织主要为树枝晶; 随着Ti摩尔分数的增加, 高熵合金树枝晶组织减少, 硬度先增加后减小, x=0.50时, 合金的硬度值最大, 为HV 755;CoCrFeNiCuTix高熵合金的自腐蚀电位都正于45#钢, 耐腐蚀性先增强后减弱, x=0.50时, 其耐腐蚀性最优。Abstract: The CoCrFeNiCuTix(x = 0.25, , 0.50, 0.75, 1.00 by molar) high-entropy alloys (HEAs) were prepared by vacuum hot-pressing sintering in this paper. The effects of Ti contents on the microstructure and corrosion resistance of the CoCrFeNiCuTix HEAs were investigated and analyzed by optical microscope (OM), X-ray diffractometer (XRD), scanning electron microscope (SEM), HVS-1000B digital microhardness tester, and electrochemical workstation. The results show that the CoCrFeNiCuTix HEAs with different Ti contents by molar have the face-centeredcubic phase structure with the dendritic crystal microstructures. With the increase of Ti content, the dendritic structure declines in numbers, and the hardness of CoCrFeNiCuTix HEAs increases first and then decreases; the microhardness of the prepared HEAs reaches the maximum up to HV 755 at x=0.5. The self-corrosion potential of the prepared HEAs is positive to that of 45# steel; with the increase of Ti content by molar, the self-corrosion potential of the prepared HEAs increases first and then decrease, and the best corrosion resistance is obtained at x=0.5.
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Key words:
- high-entropy alloys /
- vacuum hot-pressing sintering /
- microstructure /
- corrosion resistance /
- hardness
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图 1 CoCrFeNiCuTix高熵合金(x为摩尔比，x=0.25, 0.50, 0.75, 1.00)X射线衍射图
Figure 1. XRD patterns of Co Cr FeNiCuTix high-entropy alloy(x=0.25, 0.50, 0.75, 1.00 by molar)
图 2 CoCrFeNiCuTix高熵合金试样金相组织：(a)x=0.25;(b)x=0.50;(c)x=0.75;(d)x=1.00
Figure 2. Metallographic structures of CoCrFeNiCuTix high-entropy alloys: (a)x=0.25;(b)x=0.50;(c)x=0.75;(d)x=1.00
图 3 不同放大倍数Co Cr Fe Ni Cu Tix高熵合金的扫描电子显微形貌：(a)、(b)x=0.25;(c)、(d)x=0.50;(e)、(f)x=0.75;(g)、(h)x=1.00
Figure 3. SEM morphology of CoCrFeNiCuTix high-entropy alloy: (a), (b)x=0.25;(c), (d)x=0.50;(e), (f)x=0.75;(g), (h)x=1.00
图 4 CoCrFeNiCuTix高熵合金和45#钢电位极化曲线：(a)1.0 mol·L-1 H2SO4溶液；(b)3.5%NaCl溶液
Figure 4. Potential polarization curves of CoCrFeNiCuTix high-entropy alloys and 45#steel: (a)1.0 mol·L-1 H2SO4 solution; (b)3.5%NaCl solution
图 5 CoCrFeNiCuTix高熵合金经过1.0 mol·L-1 H2SO4溶液腐蚀后的显微形貌：(a)x=0.25;(b)x=0.50;(c)x=0.75;(d)x=1.00
Figure 5. SEM morphology of CoCrFeNiCuTix high-entropy alloys after the corrosion in 1.0 mol·L-1 H2SO4 solution: (a)x=0.25;(b)x=0.50;(c)x=0.75;(d)x=1.00
图 6 CoCrFeNiCuTix高熵合金经过3.5%NaCl溶液腐蚀后的显微形貌：(a)x=0.25;(b)x=0.50;(c)x=0.75;(d)x=1.00
Figure 6. SEM morphology of CoCrFeNiCuTix high-entropy alloys after the corrosion in 3.5%NaCl solution: (a)x=0.25;(b)x=0.50;(c)x=0.75;(d)x=1.00
图 7 不同Ti含量Co Cr Fe Ni Cu Tix高熵合金的维氏硬度
Figure 7. Vickers hardness of CoCrFeNiCuTix high-entropy alloys with different molar ratio of Ti
位置 Co Cr Cu Fe Ni Ti 1 18.39 20.74 17.52 20.75 18.97 3.63 2 14.48 29.36 13.84 23.64 12.16 6.52 3 20.18 17.53 15.35 18.46 22.34 6.14 4 18.10 19.13 13.79 20.21 19.27 9.50 5 17.86 21.43 11.19 18.45 18.87 12.25 6 14.65 20.23 18.43 14.84 16.27 15.58 7 22.10 21.53 6.57 13.40 19.13 17.27 8 23.07 18.34 11.19 17.06 17.51 12.83 
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表 2 CoCrFeNiCuTix高熵合金和45#钢的电化学参数
Table 2. Electrochemical parameters of CoCrFeNiCuTix high-entropy alloys and 45#steel
溶液 合金 Ecorr/V (vs SCE) Icorr/(A·cm−2) 1.0 mol·L−1H2SO4 CoCrFeNiCuTi0.25 -0.447 6.310 × 10-4 CoCrFeNiCuTi0.50 -0.240 3.162 × 10-5 CoCrFeNiCuTi0.75 -0.373 1.585 × 10-4 CoCrFeNiCuTi1.00 -0.336 5.012 × 10-5 45# -0.499 3.981 × 10-4 3.5% NaCl CoCrFeNiCuTi0.25 -0.249 1.585 × 10-4 CoCrFeNiCuTi0.50 -0.263 1.995 × 10-5 CoCrFeNiCuTi0.75 -0.243 3.162 × 10-5 CoCrFeNiCuTi1.00 -0.260 3.785 × 10-5 45# -0.373 3.981 × 10-3
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