Medium entropy alloy CoCrNi coatings: Enhancing hardness and damage-tolerance through a nanotwinned structuring
作者： Fuyang Cao , Paul Munroe , Zhifeng Zhou , Zonghan Xie
DOI: 10.1016/J.SURFCOAT.2017.12.021
关键词:
摘要: Abstract Medium entropy alloys (MEA) are defined as consisting of three equiatomic elements, such CoCrNi. MEAs reported to have superior mechanical properties and high thermodynamic stability, well excellent fracture toughness at cryogenic temperatures. Here, we investigate a series medium alloy coatings, containing Co, Cr, Ni. These coatings were deposited onto M2 steel substrates with range coating thicknesses using DC magnetron sputtering system CoCrNi target (1:1:1 at.%). The microstructure examined by number characterization techniques, including X-ray diffraction (XRD), transmission electron microscopy (TEM) nanoindentation. XRD analysis showed that the dominated fcc phase, smaller amount hcp Co. TEM demonstrated elongated grains contained density {111} nanotwins. In addition, residual stresses in analysed adopting conventional sin2ψ method. A hardness value, ~ 10 GPa, was determined nanoindentation these coatings. Exceptional damage-tolerance also found under contact loading. It is believed nanotwinned structure responsible for damage tolerance observed new
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