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研究了Nb离子注入的γ TiAl合金在 1 1 2 3K和 1 1 73K空气中的高温循环氧化行为 ,用配有能谱仪的扫描电子显微镜对氧化层的形貌、显微结构进行了分析 ,用俄歇谱仪分析了注入元素和氧化层中各元素的分布 .结果表明 :Nb离子注入可以提高γ TiAl合金的抗循环氧化性能 .提高其抗氧化性能的主要原因归结于Nb离子在TiO2 中的掺杂作用 .高价Nb的掺杂 ,降低了TiO2 的缺陷浓度 ,使TiO2 的生长受到抑制 ,在氧化初期形成了Al2 O3 保护层 ,从而推迟了氧化层的剥落时间 .但Nb离子注入的γ TiAl合金不具有长期的抗循环氧化性能
The high temperature cyclic oxidation behavior of Nb ion-implanted γ TiAl alloy in air of 1 1 2 3K and 1 1 73K was studied. The morphology and microstructure of the oxide layer were analyzed by scanning electron microscopy (SEM) The distributions of the elements in the implanted and oxide layers were analyzed by Auger spectroscopy.The results show that Nb ion implantation can improve the cyclic oxidation resistance of the γ TiAl alloy.The main reason to improve its oxidation resistance is attributed to the formation of Nb ions in TiO2 Doping of high Nb, reducing the defect concentration of TiO2, so that the growth of TiO2 is inhibited, Al2O3 protective layer is formed in the initial stage of oxidation, thereby postponing the exfoliation time of the oxide layer, but Nb ion implantation γ TiAl alloy does not have long-term anti-cyclic oxidation properties