Creep rupture property of in situ synthesized (TiB + La2O3)/Ti composite
Creep rupture property of in situ synthesized (TiB + La2O3)/Ti composite
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DOI：
10.1016/j.msea.2007.11.028
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发表时间：
2008-08
期刊：
影响因子：
6.4
通讯作者：
Yungang Li;L. Xiao;W. Lu;J. Qin;Di Zhang
中科院分区：
文献类型：
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作者：
Yungang Li;L. Xiao;W. Lu;J. Qin;Di Zhang
(TiB+La2O3)/Ti复合材料是在自耗真空电弧重熔炉中通过一种基于Ti、LaB6和原料中的氧之间的反应的新型原位技术合成的。通过X射线衍射鉴定相。通过光学显微镜和扫描电子显微镜检查微观结构。 TiB晶须和纳米La2O3球形颗粒均匀分布在基体中。在873、923和973K下测试了复合材料的蠕变断裂性能。结果表明，复合材料的蠕变断裂寿命在高温下显着增加，同时保持良好的塑性。蠕变断裂寿命甚至超过了最好的钛合金IMI 834。蠕变断裂寿命和塑性的提高主要归功于TiB晶须承担载荷、纳米La2O3颗粒的弥散强化以及LaB6的添加降低了基体中的氧含量。
(TiB+La2O3)/Ti composite was synthesized in a consumable vacuum arc remelting furnace by a novel in situ technique based on the reaction between Ti, LaB6, and oxygen in the raw materials. The phases were identified by X-ray diffraction. The microstructures were examined by means of optical microscopy and scanning electron microscopy. TiB whiskers and nano-sized La2O3spherical particles were distributed uniformly in the matrix. Creep rupture properties of the composite were tested at 873, 923 and 973K. The results showed the creep rupture life of the composite increased significantly at elevated temperature while keeping good plasticity. The creep rupture life even exceeded the best elevated titanium alloy IMI 834. The improvement of creep rupture life and plasticity were mainly attributed to undertaking load by TiB whiskers, dispersion strengthening by nano-sized La2O3particles and decrease of the oxygen content in the matrix by the addition of the LaB6.