Oxidation Behavior of Three Different Zones of Linear Friction Welded Ti₂AlNb Alloy

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• 作者：Xi Chen ; Faqin Xie ; Tiejun Ma ; Wenya Li and Xiangqing Wu
• 刊名：Advanced Engineering Materials
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：18
• 期：11
• 页码：1944-1951
• 全文大小：3267K
• ISSN：1527-2648

文摘

Linear friction welding is employed to weld a Ti₂AlNb-based alloy. The oxidation behavior of three different zones, i.e., base metal, weld zone, and thermo-mechanically affected zone is studied at 800 °C exposed to air. The oxidation kinetics of the specimens consist of an initial parabolic kinetic and followed by a linear kinetic. For the base metal, absorption of more oxygen due to higher amount of α₂ phase leads to the thickest oxidation scale, while the preferential formation of Al₂O₃ for the joint contributes to better oxidation resistance. The presence of AlNbO₄ for all the three zones can be observed after a prolong exposure in air, leading to a drastic acceleration of oxidation rate.