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Direct laser deposition cladding of AlxCoCrFeNi high entropy alloys on a high-temperature stainless steel
journal contribution
posted on 2017-12-25, 00:00 authored by Qi Chao, Tingting Guo, T Jarvis, X Wu, Peter HodgsonPeter Hodgson, Daniel FabijanicDaniel FabijanicAlxCoCrFeNi (x = 0.3, 0.6 and 0.85) high entropy alloy (HEA) claddings were produced by coaxial direct laser deposition (DLD) on a 253MA austenitic steel substrate using a mixture of blended elemental powders. The effect of key processing variables on the formation of HEA claddings and the compositional mixing between the deposited layer and the substrate was investigated through a three-level parametric study on laser power, laser scanning speed, laser beam size, powder feeding rate and hatch distance. Using selected parameters, HEA claddings mostly free of defects were successfully manufactured with very minimal dilution. With an increase in the Al mole fraction from 0.3 to 0.6 and 0.85, the HEA claddings displayed an evolution of crystal structure from FCC, to FCC + BCC and BCC, accompanied by an increase in microhardness. The increased Al content also resulted in reduced microstructural stability of the coatings and hence higher level of thermal softening upon isothermal treatment at 1000 °C.
History
Journal
Surface and coatings technologyVolume
332Pagination
440 - 451Publisher
ElsevierLocation
Amsterdam, The NetherlandsPublisher DOI
ISSN
0257-8972Language
engPublication classification
C1 Refereed article in a scholarly journalCopyright notice
2017, Elsevier B.V.Usage metrics
Keywords
Direct laser depositionHigh entropy alloyDilutionCoatingLaser claddingThermal stabilityScience & TechnologyTechnologyPhysical SciencesMaterials Science, Coatings & FilmsPhysics, AppliedMaterials SciencePhysicsMECHANICAL-PROPERTIESCORROSION BEHAVIOROXIDATION BEHAVIORPHASE EVOLUTIONMICROSTRUCTURECondensed Matter Physics
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