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1Effect of Y_2O_3 on microstructure and oxidation of γ-Ni+γ′-Ni_3Al coatings transformed from electrodeposited Ni-Al films at 1000℃显示文摘The electrodeposited Y2O3-dispersedγ-Ni+γ′-Ni3Al coatings on Ni substrates were developed by the conversion of electrodeposited Ni-Al-Y2O3 films with dispersed Al microparticles in Ni matrix into Ni3Al by vacuum annealing at 800℃for 3 h. For comparison,Y2O3-freeγ-Ni+γ′-Ni3Al coatings with a similar Al content were also prepared by vacuum annealing the electrodeposited microparticle-dispersed composite coatings of Ni-Al under the same condition.SEM and TEM characterizations show that the electrodeposited Y2O3-dispersedγ+γ′coatings exhibit finer grains,a more homogeneous distribution ofγ′,and a narrowedγ′phase spacing compared with the electrodeposited Y 2 O3-freeγ+γ′coatings.The oxidation at 1 000℃shows that the addition of Y2O3 significantly improves the oxidation resistance of the electrodepositedγ+γ′coatings.The effect of Y2O3 particles on the microstructure and oxidation behavior of the electrodepositedγ+γ′coatings was discussed in detail.周月波 张海军 王振廷 2008中国有色金属学会会刊:英文版2008,18,2:1
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