Huang Jiakai, Zhang Peng, Yang Junjie, Li Wei, Wang Qiwei, Li Jie
Institute of Advanced Wear & Corrosion Resistant and Functional Materials, Jinan University, Guangzhou 510632, China.
Materials (Basel). 2025 Jun 5;18(11):2670. doi: 10.3390/ma18112670.
(AlTiV)Cr high-entropy alloys (HEAs) is expected to solve the problem of poor corrosion-wear resistance of lightweight alloys. To elucidate its corrosion-wear mechanism, three (AlTiV)Cr alloys were prepared by vacuum arc melting method by repeating the melting five times at 240 A current.and their microstructures, mechanics, corrosion, wear, and corrosion-wear behaviors were investigated. The results indicate that (AlTiV)Cr is a single-phase with BCC structure and the VEC of Cr5, Cr10 and Cr15 were 4.0, 4.1 and 4.2 respectively. Their hardness increase and toughness and corrosion resistance decrease with the increase of Cr content (Cr5:537.5 HV/6.7%/1.86 × 10 A/cm; Cr10:572.3 HV/5.6%/2.09 × 10 A/cm; Cr15:617.6 HV/3.8%/2.51 × 10 A/cm). The wear volume and the corrosion-wear volume of AlTiVCr alloys are mainly caused by the abrasive wear. However, the fatigue wear of AlTiVCr alloys could be exacerbated by a decrease in material's toughness, corrosion resistance, and an increase in solution corrosivity. Therefore, Cr10 presents the optimal wear resistance in the deionized water, while the optimal corrosion-wear resistance in the 3.5 wt.% NaCl solution is presented by Cr5. Compared to TC4, the wear and corrosion-wear resistance were improved by 56.4% and 65.5%, respectively.
(AlTiV)Cr 高熵合金有望解决轻质合金耐蚀磨损性能差的问题。为阐明其腐蚀磨损机制，采用真空电弧熔炼法，在 240 A 电流下重复熔炼 5 次制备了三种(AlTiV)Cr 合金，并对其微观结构、力学性能、腐蚀、磨损及腐蚀磨损行为进行了研究。结果表明，(AlTiV)Cr 为具有体心立方结构的单相合金，Cr5、Cr10 和 Cr15 的价电子浓度分别为 4.0、4.1 和 4.2。随着 Cr 含量的增加（Cr5：537.5 HV/6.7%/1.86×10 A/cm；Cr10：572.3 HV/5.6%/2.09×10 A/cm；Cr15：617.6 HV/3.8%/2.51×10 A/cm），它们的硬度增加，韧性和耐蚀性降低。AlTiVCr 合金的磨损体积和腐蚀磨损体积主要由磨粒磨损引起。然而，材料韧性和耐蚀性的降低以及溶液腐蚀性的增加会加剧 AlTiVCr 合金的疲劳磨损。因此，Cr10 在去离子水中具有最佳耐磨性，而 Cr5 在 3.5 wt.% NaCl 溶液中具有最佳耐蚀磨损性。与 TC4 相比，磨损和耐蚀磨损性能分别提高了 56.4%和 65.5%。
