CoCrFeNi(W1 − xMox) high-entropy alloy coatings with excellent mechanical properties and corrosion resistance prepared by mechanical alloying and hot pressing sintering
| Autor: | Yan Wang, Eugen Axinte, Xu-ting Li, Peng Li, Peng-chao Qiao, Jian-wei Du, Jun Sun, Caiyun Shang |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Materials science Mechanical Engineering Alloy Metallurgy Sintering 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology Hot pressing Microstructure 01 natural sciences Indentation hardness Corrosion Coating Mechanics of Materials 0103 physical sciences engineering lcsh:TA401-492 General Materials Science lcsh:Materials of engineering and construction. Mechanics of materials 0210 nano-technology Solid solution |
| Zdroj: | Materials & Design, Vol 117, Iss, Pp 193-202 (2017) |
| ISSN: | 0264-1275 |
| Popis: | The CoCrFeNiW and CoCrFeNiW0.5Mo0.5 high-entropy alloy coatings (HEACs) have been prepared by mechanical alloying and vacuum hot pressing sintering (VHPS) technique on Q235 steel substrate. The microstructures, microhardness, wear resistance and corrosion resistance of HEACs were studied in detail. The final milling products for as-milled CoCrFeNi(W1 − xMox) (x = 0, 0.5) coating powders are the mixture of body-centered cubic (BCC) and face-centered cubic (FCC) solid solution phases, while order FCC phase exists for CoCrFeNiW. VHPS-ed CoCrFeNiW and CoCrFeNiW0.5Mo0.5 HEACs are 600 and 650 μm in thickness respectively, and bear a good metallurgical bonding to the substrate. Both HEACs comprise two FCC phases with a small amount of δ-NiW and σ-CoCr phases. The average microhardness values of CoCrFeNiW and CoCrFeNiW0.5Mo0.5 HEACs reach 669 and 600 HV respectively, which far exceed the substrate (160 HV). And both coatings exhibit superior wear resistance than substrate under the same wear conditions. The corrosion resistance in 3.5% NaCl solution of the coatings is improved compared with substrate. Especially, Mo addition remarkably enhances corrosion resistance as reflected by the lowest corrosion current density and more positive corrosion potential as well as a reduction in average corrosion rate. Keywords: High entropy alloy coating, Mechanical alloying, Vacuum hot pressing sintering, Wear resistance, Corrosion resistance |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect