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Microstructure, Mechanical Properties and Oxidation Behavior of a Hot-Extruded TiAl Containing Ta
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Microstructure, Mechanical Properties and Oxidation Behavior of a Hot-Extruded TiAl Containing Ta
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National Natural Science Foundation of China (51201138)

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    摘要:

    對熱擠壓后新型TiAl合金Ti-46.5Al-3Ta-2Cr-0.2W的微觀結(jié)構(gòu)，力學(xué)性能及氧化行為進行了研究。結(jié)果表明，該合金擠壓后微觀組織主要由γ和α2相組成近片層組織，其片層晶粒尺寸為50~70 μm。通過不同冷卻速率獲得了等軸，近片層及全片層的結(jié)構(gòu)，尤其是在油淬后的組織中發(fā)現(xiàn)了大量的塊狀相。拉伸試驗結(jié)果表明，擠壓后的合金室溫屈服強度和抗拉伸強度分別從807和846 MPa，降至800 ℃的620和760 MPa，而其伸長率從2.16%提高至3%左右，說明該合金在高溫條件下依然具有較高的強度。斷口觀察表明，與其他合金相比，該合金的裂紋長度較小，而且Ta的添加有利于合金塑性的提高。最后對新型TiAl基合金在800 ℃氧化行為進行了討論，發(fā)現(xiàn)Ta的加入可以降低氧在TiAl合金的溶解度，同時因其本身具有低的擴散率，在升高溫度時能抑制TiO2的生長

    Abstract:

    The microstructure, the mechanical properties and the oxidation behavior of a novel Ti-46.5Al-3Ta-2Cr-0.2W (at%) alloy after hot extrusion were investigated. The results show that the alloy is mainly composed of γ and α2 phases, which has fine near lamellar microstructure with colony sizes of 50~70 μm after hot extrusion. The different microstructures after hot extrusion were obtained by different cooling rates, and a great amount of massive phase were found at grain boundaries by oil quenching. Tensile test results exhibit that the yield strength (YS) and ultimate tensile strength (UTS) of the alloy after hot extrusion decrease from 807 and 846 MPa at room temperature to 620 and 760 MPa at 800 °C, respectively, and the elongation (EI) of the alloy increases from 2.16% at room temperature to 3% at 800 °C which means that the alloy still keeps higher strength at elevated temperature. The observation of fracture surfaces shows that the crack length of the present alloy is smaller, and the additive of Ta increases the ductility of Ti-46.5Al-3Ta-2Cr-0.2W alloy at room temperature. The oxidation behavior of the novel TiAl based alloy in the experimental range was discussed. It is found that the addition of Ta can reduce the oxygen solubility into the TiAl alloy and suppress TiO2 growth at elevated temperature due to the low diffusivity

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羅媛媛,曾衛(wèi)東,奚正平,毛小南,楊英麗,吳金平,蘇航標(biāo). Microstructure, Mechanical Properties and Oxidation Behavior of a Hot-Extruded TiAl Containing Ta[J].稀有金屬材料與工程,2015,44(2):282~287.[Luo Yuanyuan, Zeng Weidong, Xi Zhengping, Mao Xiaonan, Yang Yingli, Wu Jinping, Su Hangbiao. Microstructure, Mechanical Properties and Oxidation Behavior of a Hot-Extruded TiAl Containing Ta[J]. Rare Metal Materials and Engineering,2015,44(2):282~287.]
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  • 收稿日期:2014-04-01
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  • 在線發(fā)布日期: 2015-05-29
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