The effect of Ta alloyed state on the corrosion resistance of TC4 surface laser cladding high entropy alloy
Ti4Al0.5NiCr2NbTa0.5 non-equimolar high entropy alloy (HEA) coatings were successfully prepared by laser cladding technology, the Ta element alloyed state in the coatings was changed by adjusting the laser energy density during cladding. The effects of Ta alloyed state on the phase structure, micros...
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Elsevier
2025-01-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785424028205 |
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| author | Feixiang Tian Qiyu Gao Leilei Wang Xiaohu Guan Xiaohong Zhan |
| author_facet | Feixiang Tian Qiyu Gao Leilei Wang Xiaohu Guan Xiaohong Zhan |
| author_sort | Feixiang Tian |
| collection | DOAJ |
| description | Ti4Al0.5NiCr2NbTa0.5 non-equimolar high entropy alloy (HEA) coatings were successfully prepared by laser cladding technology, the Ta element alloyed state in the coatings was changed by adjusting the laser energy density during cladding. The effects of Ta alloyed state on the phase structure, microstructure evolution, microhardness, corrosion resistance and passivation film of coatings were investigated. The results showed that the Ti4Al0.5NiCr2NbTa0.5 coating was composed of BCC and Ti2Ni-laves phases. With the increase in energy density, the increased content of Ta in the BCC phase promotes the formation of the BCC phase while suppressing the precipitation of the Ti₂Ni-Laves phase. However, this also leads to the transformation of the BCC phase from a fine dendritic structure to coarse equiaxed crystals. Meanwhile, the Laves phase, which is initially distributed in a reticulated at the grain boundaries, gradually fragments into a dotted distribution within the BCC phase. As grain coarsening occurs and the Laves phase decreases, the effects of fine-grain strengthening and second-phase strengthening gradually weaken, and the microhardness of the coating decreases from 675.5 HV to 483.4 HV. Additionally, the coating exhibited excellent corrosion resistance. With the change in the alloyed state of Ta, the stability of the passive film on the coating gradually increased, and the oxides of the refractory elements Ta and Nb transitioned from a sub-oxidized state to a stable oxidized state. The minimum corrosion current density of the coatings was only 0.877 × 10−8 A/cm2, and secondary passivation were observed during the polarization treatment of all coatings. |
| format | Article |
| id | doaj-art-24f48f86bbd644d3b34a7812ee3af3d2 |
| institution | Kabale University |
| issn | 2238-7854 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj-art-24f48f86bbd644d3b34a7812ee3af3d22025-01-19T06:25:07ZengElsevierJournal of Materials Research and Technology2238-78542025-01-0134220232The effect of Ta alloyed state on the corrosion resistance of TC4 surface laser cladding high entropy alloyFeixiang Tian0Qiyu Gao1Leilei Wang2Xiaohu Guan3Xiaohong Zhan4College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 211106, ChinaCorresponding author.; College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 211106, ChinaCollege of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 211106, ChinaCollege of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 211106, ChinaCorresponding author.; College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 211106, ChinaTi4Al0.5NiCr2NbTa0.5 non-equimolar high entropy alloy (HEA) coatings were successfully prepared by laser cladding technology, the Ta element alloyed state in the coatings was changed by adjusting the laser energy density during cladding. The effects of Ta alloyed state on the phase structure, microstructure evolution, microhardness, corrosion resistance and passivation film of coatings were investigated. The results showed that the Ti4Al0.5NiCr2NbTa0.5 coating was composed of BCC and Ti2Ni-laves phases. With the increase in energy density, the increased content of Ta in the BCC phase promotes the formation of the BCC phase while suppressing the precipitation of the Ti₂Ni-Laves phase. However, this also leads to the transformation of the BCC phase from a fine dendritic structure to coarse equiaxed crystals. Meanwhile, the Laves phase, which is initially distributed in a reticulated at the grain boundaries, gradually fragments into a dotted distribution within the BCC phase. As grain coarsening occurs and the Laves phase decreases, the effects of fine-grain strengthening and second-phase strengthening gradually weaken, and the microhardness of the coating decreases from 675.5 HV to 483.4 HV. Additionally, the coating exhibited excellent corrosion resistance. With the change in the alloyed state of Ta, the stability of the passive film on the coating gradually increased, and the oxides of the refractory elements Ta and Nb transitioned from a sub-oxidized state to a stable oxidized state. The minimum corrosion current density of the coatings was only 0.877 × 10−8 A/cm2, and secondary passivation were observed during the polarization treatment of all coatings.http://www.sciencedirect.com/science/article/pii/S2238785424028205High entropy alloyCorrosion resistanceLaser claddingMicrostructure evolutionPassivation film |
| spellingShingle | Feixiang Tian Qiyu Gao Leilei Wang Xiaohu Guan Xiaohong Zhan The effect of Ta alloyed state on the corrosion resistance of TC4 surface laser cladding high entropy alloy Journal of Materials Research and Technology High entropy alloy Corrosion resistance Laser cladding Microstructure evolution Passivation film |
| title | The effect of Ta alloyed state on the corrosion resistance of TC4 surface laser cladding high entropy alloy |
| title_full | The effect of Ta alloyed state on the corrosion resistance of TC4 surface laser cladding high entropy alloy |
| title_fullStr | The effect of Ta alloyed state on the corrosion resistance of TC4 surface laser cladding high entropy alloy |
| title_full_unstemmed | The effect of Ta alloyed state on the corrosion resistance of TC4 surface laser cladding high entropy alloy |
| title_short | The effect of Ta alloyed state on the corrosion resistance of TC4 surface laser cladding high entropy alloy |
| title_sort | effect of ta alloyed state on the corrosion resistance of tc4 surface laser cladding high entropy alloy |
| topic | High entropy alloy Corrosion resistance Laser cladding Microstructure evolution Passivation film |
| url | http://www.sciencedirect.com/science/article/pii/S2238785424028205 |
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