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A gradient NiCoCrAlYSiB coating was prepared by a combined system of arc ion plating and magnetron sputtering. After annealing, the elements of the gradient coating are chemically graded distributed with Al enrich in the outer layer and Cr enrich in the intermediate layer. In terms of the surface energy, the phase transformation from the transient alumina to stable α-alumina was discussed. After 300h...
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