Effects of Al Contents on Carburization Behavior and Corrosion Resistance of TiAl Alloys
Effects of Al Contents on Carburization Behavior and Corrosion Resistance of TiAl Alloys
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Al含量对TiAl合金渗碳行为和耐蚀性能的影响
DOI：
10.1007/s11665-015-1708-6
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发表时间：
2015
影响因子：
2.3
通讯作者：
Xing Zu Ming
中科院分区：
文献类型：
--
作者：
Cui Jiao Liao;Yue Hui He;Xing Zu Ming
Al含量为30.7、37、46.5和54.2at.%的TiAl合金被碳化了对比分析了未处理和渗碳后TiAl合金的耐蚀性。用X射线衍射和扫描电镜分别研究了TiAl合金渗碳后的相组成和显微组织。采用动电位极化曲线和电化学阻抗谱研究了未处理和渗碳后TiAl合金的电化学腐蚀行为。试验结果表明，不同的铝含量导致渗碳层组织的不同。Al含量越低，形成的二元碳化物越厚，Ti2AlC相越薄。此外，较低的Al含量导致在未处理和渗碳状态下较高的耐腐蚀性。
TiAl alloys with Al contents of 30.7, 37, 46.5, and 54.2 at.% were carburized. Corrosion resistance of the untreated and the carburized TiAl alloys was comparatively analyzed. The phase and microstructure of the carburized TiAl alloys were studied by x-ray diffraction and scanning electron microscopy, respectively. Electrochemical corrosion behavior of the untreated and the carburized TiAl alloys was investigated using potentiodynamic polarization and electrochemical impedance spectroscopy. Experimental results indicate that different Al contents bring about distinct microstructure of the carburized layers. The lower Al content leads to the formation of the thicker binary carbides and the thinner Ti2AlC phase. Additionally, the lower Al content leads to higher corrosion resistance in the untreated and the carburized states.