This paper investigates the horizontal Nash game and structure selection strategy in two competing dominant enterprises. Each firm decides whether to outsource the retail or manufacture to the exclusive third-party enterprise and thus forms a decentralized supply chain structure. On the premise that third-party enterprises have no advantage on sales and manufacture cost, the revenue-sharing contract is introduced between the manufacturer and retailer, and the influence of decentralized structure on the game equilibrium structure and supply chain profit is analyzed based on Hotelling model. The results show that, when compared with centralized structure, decentralized supply chain has the structural advantage to improving not only its supply chain profits but also the competing chain. This interesting insight is counterintuitive to the common "double marginalization" effect and explains the outsourcing strategy from the perspective of supply chain competition. In addition, we find the dominant strategy in the evolutionary game is that both two chains are decentralized or integrated.
In order to explore the effect of rare earth elements (REEs) on the eutectic high-entropy alloys (EHEAs), 0.2 atomic per cent of Sc, Y, and La elements were added to the AlCoCrFeNi2.1(REE0) EHEA in this work. The phase composition, element distribution, electrochemical properties and mechanical properties of the alloys were analysed. The results showed that the AlCoCrFeNi2.1-based HEAs are still composed of Co, Cr, Fe (face-centred cubic)-rich phase and Al, Ni (face-centred cubic)-rich phase. After Sc, Y, La were added, Ni2Sc, Al2Y, Al2La and other intermetallics were formed in the AlCoCrFeNi2.1 alloy. In addition, it was proved that Y element can promote the formation of hexagonal close-packed (HCP) phase. AlCoCrFeNi2.1Y0.2(Y0.2) alloy has excellent corrosion resistance. AlCoCrFeNi2.1Sc0.2(Sc0.2) alloy has the best mechanical properties. HIGHLIGHTS With the addition of rare earth elements, the face-centred cubic phase and the B2 phase still exist in the alloy. In addition, there are intermetallics in the alloys. Combined with first-principles calculations, it was determined that the Laves phases in AlCoCrFeNi2.1Y0.2 alloy may be Al2Y, Al3Y or AlY. The Laves phase in the AlCoCrFeNi2.1La0.2 alloy may be Al2La, Al3La or LaNi5. The addition of Y element can promote the formation of HCP phase in AlCoCrFeNi2.1 alloy. The generated HCP phase occupies the position of the original B2 phase. Y element can also improve corrosion resistance. The Vickers hardness of AlCoCrFeNi2.1Sc0.2 alloy is 20% higher than that of AlCoCrFeNi2.1 alloy, while the compressive strength of 1897 MPa and the compressive deformation of 26% are retained.
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