Hybrid (TiB + TiC ) reinforced Ti-1100 matrix composites were in-situ synthesized by common casting and hot working in this work .Microstructures of the TMCs were investigated ,mechanical properties of the matrix alloy and composites were evaluated by tensile tests at elevated temperatures ,and strengthening mechanisms of the TMCs were studied by modeling thoroughly .The results show that ,a model is suggested to predict yield strengths of the TMCs .High-temperature mechanical properties of the composites are much better than that of the matrix alloy .The increase of the yield strength is ascribed to the effects of the solid solution strengthening of carbon ,the load transfer behavior of TiB fibers , and the dislocation strengthening of TiC particles .%利用常规钛合金的真空自耗熔炼以及热加工技术,制备了原位自生(TiB+ TiC )/Ti-1100复合材料.对该复合材料的微观结构进行研究,并分别在高温环境下测试了基体合金以及复合材料的高温拉伸性能,最后对其强化机制进行研究.结果表明:钛基复合材料的屈服强度可以用数学模型来计算.增强体的加入使复合材料的高温力学性能明显优于基体合金,且其高温强度的提高主要受益于碳的固溶强化、TiB纤维的传递载荷、TiC颗粒的强化位错等因素的贡献.
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