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以Ti-48Al-2Cr-2Nb(at%)合金为研究对象,通过热处理获得近片层和全片层两种显微组织,并在800℃空气条件下,进行了100 h的抗氧化性实验。利用OM、SEM、TEM、XRD和EDS对试样的微观结构、相组成及微区成分进行了分析。恒温氧化动力学结果表明:在800℃空气条件下,对于近片层和全片层两种Ti Al合金组织,其恒温氧化动力学曲线符合近抛物线规律,且近片层组织合金的抗氧化性能优于全片层组织。基于氧化动力学曲线、组织结构、氧化膜结构、氧化表面形貌分析,表明Ti Al合金的片层组织结构对其氧化行为具有不可忽视的影响。
Ti-48Al-2Cr-2Nb (at%) alloy was used as the research object. Two kinds of microstructures of the near-layer and the whole-layer were obtained by heat treatment and the oxidation resistance test was carried out at 800 ℃ for 100 h . The microstructure, phase composition and micro-zone composition of the samples were analyzed by OM, SEM, TEM, XRD and EDS. The results of isothermal oxidation kinetics show that the kinetic curves of isothermal oxidation kinetics of near-surface and full-surface TiAl alloys conform to the near-parabolic law at 800 ℃ and the oxidation resistance Better than full lamellar tissue. Based on the oxidation kinetics curve, the structure of the structure, the structure of the oxide film and the analysis of the surface morphology of the oxidized surface, it is shown that the microstructure of the TiAl alloy sheet has an irreversible effect on its oxidation behavior.