| 引用本文: | 汪熹澄,郑云飞,杨建辉,肖树龙,徐丽娟,田竟.(TiB+TiC+Y2O3)/α-Ti复合材料高温拉伸性能及蠕变行为研究[J].材料科学与工艺,2025,33(4):1-13.DOI:10.11951/j.issn.1005-0299.20240033. |
| WANG Xicheng,ZHENG Yunfei,YANG Jianhui,XIAO Shulong,XU Lijuan,TIAN Jing.Research on high-temperature tensile properties and creep behavior of (TiB+TiC+Y2O3)/α-Ti composites[J].Materials Science and Technology,2025,33(4):1-13.DOI:10.11951/j.issn.1005-0299.20240033. |
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| 摘要: |
| 采用真空感应熔炼方法制备了(TiB+TiC+Y2O3)/α-Ti复合材料及其对应的基体合金,通过XRD、SEM、TEM等表征手段研究了两种材料的组织和性能。结果表明:基体合金显微组织为粗大的魏氏组织,复合材料为典型的网篮状组织并有少量等轴α相生成。增强相的引入使钛基复合材料的极限抗拉强度及蠕变抗力得到了显著提高。与基体合金相比,650 ℃时的复合材料的高温拉伸性能提高了约170 MPa,蠕变寿命最高提升了348%,最小蠕变速率可以下降一个数量级,展示出极佳的强化效果。对于基体合金,蠕变过程中位错运动主要受α/β界面限制；而对于复合材料,增强相具有良好的承载强化作用,在其周围形成了高密度位错区,并促进了硅化物的析出,进而有效改善了材料的抗蠕变性能。本文的研究结果可为混杂增强钛基复合材料的发展和应用提供一定的指导和借鉴。 |
| 关键词: 钛基复合材料 显微组织 拉伸性能 蠕变行为 硅化物 |
| DOI：10.11951/j.issn.1005-0299.20240033 |
| 分类号:TG146.2 |
| 文献标识码:A |
| 基金项目:国家自然科学基金资助项目(52301143). |
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| Research on high-temperature tensile properties and creep behavior of (TiB+TiC+Y2O3)/α-Ti composites |
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WANG Xicheng1, ZHENG Yunfei1, YANG Jianhui2, XIAO Shulong1, XU Lijuan1, TIAN Jing1
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(1.School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China; 2.Aerospace Research Institute of Materials & Processing Technology, Beijing 100076, China)
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| Abstract: |
| A (TiB+TiC+Y2O3)/α-Ti composite and its corresponding matrix alloy were prepared by induction skull melting. The structure and properties of the two materials were studied by XRD,SEM and TEM. The results showed that the matrix alloy possessed a typical Widmanstatten structure while the composite displayed a basket-weave structure with a few equiaxed α phases formed after the reinforcements were added. The ultimate tensile strength and creep resistance of titanium matrix composite improved significantly with the introduction of reinforcements. Compared with the matrix alloy, the high-temprerature tensile properties of the composite at 650 ℃ have increased by approxinately 170 MPa, the creep life of the composite increased by a maximum of 348%, and the minimum creep rate decreased by one order of magnitude, showing excellent strengthening effect. For the matrix alloy, the dislocation movement during creep mainly limited by the α/β interface. For the composite, the reinforcements hada good load-bearing strengthening effect, forming high density dislocation zones around the reinforcements, and promoting the precipitation of silicide, which effectively improved the creep resistance of the material.The results of this paper can provide guidance and reference for the development and application of hybrid-reinforced titanium matrix composites in the future. |
| Key words: titanium matrix composites microstructure tensile property creep behavior silicide |
