Microstructure and properties of CoCrFeNiAlx (x = 0.1, 0.5, 1) high-entropy alloys enhanced by laser surface remelting

Lyu, Peng; Gao, Qi; Peng, Tao; Yuan, Haoming; Guan, Qingfeng; Cai, Jie; Liu, Haixia

doi:10.1016/j.matchar.2021.111717

Cited by 29 publications

(6 citation statements)

References 47 publications

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“…The above two factors result in the difference in wear rate reported in Ref. [48] and this study. Figure 12 show the wear morphologies of the samples.…”

Section: Corrosion Wear Resistancementioning

confidence: 51%

“…E corr and i s are −0.319 V and 6.3 × 10 −6 A•cm −2 . Peng et al [48] used an arc melting method to prepare CoCrFeNiAl high-entropy alloy and also investigated its corrosion behaviors in the same system. E corr and i corr are −0.756 V and 7.462 × 10 −6 A•cm −2 .…”

Section: Corrosion Resistancementioning

confidence: 99%

“…For the two coatings, their average wear rates (7. The wear resistance of the CoCrFeNiAl high-entropy alloy reported in Ref. [48] was also investigated. The alloy demonstrated excellent wear resistance because of its low wear rate (0.99 × 10 −4 mm 3 •N −1 •m −1 ), which was approximately 39% that in this study (2.54 × 10 −4 mm 3 •N −1 •m −1 ).…”

Section: Corrosion Wear Resistancementioning

confidence: 99%

“…The reason for this is as follows: the adapted counterpart in Ref. [48] is the GCr15 ball, which possesses a lower hardness than the YG6 tungsten steel ball applied in this study. The low hardness produces weak microcutting on the testing sample, The wear profiles of the samples subject to wear at 2, 4, 6, 8, and 10 h are presented in Figure 10.…”

Section: Corrosion Wear Resistancementioning

confidence: 99%

“…On the other hand, the wear test in Ref. [48] was performed in air, but this was carried out in the corrosion circumstance. The studies showed that the material loss under the mechanical-chemical interaction was much higher than that under the purely mechanical action [50].…”

Section: Corrosion Wear Resistancementioning

confidence: 99%

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Investigation into the Corrosion Wear Resistance of CoCrFeNiAlx Laser-Clad Coatings Mixed with the Substrate

2022

Metals

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CoCrFeNiAlx (x = 0 and 1.0) high-entropy alloy coatings were synthesized on Ti6Al4V via laser cladding to improve their corrosion and wear resistance under corrosive conditions. Results indicated that the coating (CoCrFeNi) was largely composed of irregular primary α(Ti) and honeycomb-like eutectics of α(Ti) + Ti2Ni as the matrix, with TiC dendrites as the reinforcement. When Al was introduced into the cladding material, irregular α(Ti) grains were transformed into equiaxed grains, besides which the area fraction in eutectics was considerably reduced, and TiC dendrites were also transformed into spherical particles. Compared with the coating without Al, the introduction of Al contributed to the improvement in corrosion resistance because corrosion potential was enhanced from −0.524 V to −0.393 V, whereas corrosion current density and steady current density were reduced from 2.249 × 10−7 A·cm−2 and 1.021 × 10−6 A·cm−2 to 1.260 × 10−7 A·cm−2 and 2.506 × 10−7 A·cm−2, respectively. The substrate was still at the break-in stage during a long-term sliding of 10 h because its wear rate exhibited an approximately linear reduction tendency (2.09 × 10−3 mm3·N−1·m−1 for 2 h and 7.44 × 10−4 mm3·N−1·m−1 for 10 h). With respect to the coatings, they transitioned from the break-in stage into the stable wear stage when the sliding duration exceeded 4 h, during which a comparatively stable wear rate of 2.88 × 10−4 mm3·N−1·m−1 was obtained. The wear mechanism of the substrate was identified as slight microcutting and serious oxidation for the long-term sliding of 10 h. It changed into a combination of slight microcutting, serious oxidation, and moderate brittle debonding for the coatings. Generally speaking, the introduction of Al can refine the microstructure and improve the microstructural uniformity. Moreover, the passive film can be formed more rapidly on the coating surface and presents higher stability when introducing Al. Finally, the introduction of Al also promotes the coating to enter into the stable wear stage more rapidly and causes the decrease in friction coefficient and wear rate.

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“…The above two factors result in the difference in wear rate reported in Ref. [48] and this study. Figure 12 show the wear morphologies of the samples.…”

Section: Corrosion Wear Resistancementioning

confidence: 51%

Section: Corrosion Resistancementioning

confidence: 99%

Section: Corrosion Wear Resistancementioning

confidence: 99%

Section: Corrosion Wear Resistancementioning

confidence: 99%

Section: Corrosion Wear Resistancementioning

confidence: 99%

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