Anomalous microstructure and tribological evaluation of AlCrFeNiW0.2Ti0.5 high-entropy alloy coating manufactured by laser cladding in seawater

Published on Sep 20, 2021in Journal of Materials Science & Technology8.067
· DOI :10.1016/J.JMST.2020.12.050
Hui Liang4
Estimated H-index: 4
(DUT: Dalian University of Technology),
Dongxu Qiao7
Estimated H-index: 7
(DUT: Dalian University of Technology)
+ 3 AuthorsTongmin Wang36
Estimated H-index: 36
(DUT: Dalian University of Technology)
Sources
Abstract
Abstract To evaluate the potential of high entropy alloys for marine applications, a new high entropy alloy coating of AlCrFeNiW0.2Ti0.5 was designed and produced on Q235 steel via laser cladding. The microstructure, microhardness and tribological performances sliding against YG6 cemented carbide, GCr15 steel and Si3N4 ceramic in seawater were studied in detail. The AlCrFeNiW0.2Ti0.5 coating showed an anomalous ‘sunflower-like’ morphology and consisted of BCC and ordered B2 phases. The microhardness was approximately 692.5 HV, which was 5 times higher than substrate. The coating showed more excellent tribological performances than Q235 steel and SUS304, a typical material used in seawater environment, sliding against all three coupled balls in seawater. Besides, the wear and friction of AlCrFeNiW0.2Ti0.5 coating sliding against YG6 in seawater were most mild. The main reason was the generation of Mg(OH)2, CaCO3, metal oxides and hydroxides and the formation of protective tribo-film on the worn surface of AlCrFeNiW0.2Ti0.5 coating in the process of reciprocated sliding. This would effectively hinder the direct contact between the worn surfaces of AlCrFeNiW0.2Ti0.5 coating and YG6 ball, resulting in a decrease of friction coefficient and wear rate. Thus the YG6 was an ideal coupled material for AlCrFeNiW0.2Ti0.5 coating in seawater, and the coating would become a promising wear-resisting material in ocean environment.
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#1Feng Mao (HAUST: Henan University of Science and Technology)H-Index: 12
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Abstract The influence of Eu additions upon the silicon phase and mechanical properties of Al-40Zn-6Si alloys have been investigated via scanning electron microscopy (SEM) and high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM). The primary Si was discovered to be remarkably refined and modified to nodular with 0.5% Eu addition. Meanwhile, the plate-like eutectic Si was modified to a fibrous structure. The effect of Eu on nodular primary Si was clarified from fiv...
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The AlCrFeNi2W0.2Nbx high-entropy alloy (HEA) coatings were synthesized on the 304 stainless steel by laser cladding. The microstructure, microhardness and wear resistance of HEA coatings were investigated. The HEA coatings show a good metallurgical bonding to the substrate, and they consist of the cladding zone, bonding zone and heat-affected zone. The phase structures of the HEA coatings are the BCC solid solution phase and the Fe2Nb-type Laves phase. The Nb0.5 composition shows a hypo-eutecti...
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Abstract A novel high entropy alloy with the composition of CoFeNi2V0.5Mo0.2, shows unusual strain hardening ability and an excellent combination of ductility and strength. Especially at 873 K, the elongation can reach 189.2%, almost three times that of the common high temperature alloys. Microstructural characterization suggests a coexistence of planar slip and cross slip. The resistance of planar slip serves to strengthen the alloy, while the cross slip effectively relieves strain concentratio...
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Al–Co–Cr–Fe high-entropy alloy coatings were laser additively produced on aluminum substrate under different laser fluences (17.0–21.2 J/mm2). The resultant coatings consisted of a mixture of high-entropy and intermetallic phases, which resulted in marked improvement in hardness (~ 275–500 HV) as compared to the aluminum substrate (~ 30 HV). Coating corresponding to higher laser fluences showed lower corrosion currents (Icorr ~ 3.6 × 10−4 mA/cm2) and higher linear polarization resistance (LPR) o...
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Abstract To obtain Al alloys possessing the excellent hydrogen-generation performance with high efficiency/low cost via the hydrolysis reaction of aluminum with water, a series of as-cast Al alloys (∼10 g) alloying by 13 kinds of Ga-based low melting point alloys with different contents were prepared by the high frequency induction melting method under a high purity argon atmosphere. The effect of the content and composition of the low melting point alloys on the hydrogen-production property of ...
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#3Mingliang Wang (DUT: Dalian University of Technology)H-Index: 3
The effect of Al and Si on microstructure evolution, mechanical, magnetic properties, and electrical resistivity of non-equimolar Fe2CoNi(AlSi)x (x = 0–0.4) high-entropy alloys (HEAs) was studied. This series of Fe2CoNi(AlSi)x HEAs has a dual-phase structure and shows an excellent combination of mechanical and soft magnetic properties. In particular, the Fe2CoNi(AlSi)0.4 HEA exhibits high compressive yield strength σ0.2 (887.6 MPa), fracture strain (39%), electrical resistivity ρ (84.8 μΩ cm), M...
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