|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||GAT-2017 (Gamma Alloys Technology - 2017)
||Effect of Surface Condition on the RT Tensile Properties and Oxidation Resistance of TiAl Alloys
||Bochao Lin, Renci Liu, Qing Jia, Yuyou Cui, Rui Yang
|On-Site Speaker (Planned)
RT tensile properties and oxidation resistance during thermal exposure of wrought TiAl tensile specimens with different surface conditions were investigated. Ground tensile specimens of extruded Ti-46Al-2Cr-2Nb-0.15B alloy were subjected to mechanical polishing and electro-chemical polishing to get different surface conditions. Surface morphology, tensile properties, and oxidation behavior during thermal exposure and tensile properties after thermal exposure of specimens with different surface conditions were compared. Results show that both mechanical polishing and electro-chemical polishing reduce the surface roughness and improve the RT ductility but the latter is more effective. The oxidation resistance at 1073 K of the mechanical polished and electro-chemical polished specimens was improved compared to ground specimens, with electro-chemical polished specimens having the smallest mass change which may be due to ‘halogen effect’ caused by HClO4 in the electrolyte. RT ductility decreased after thermal exposure, while the drop is smallest for electro-polished specimens and largest for ground specimens.
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