Microstructure and Mechanical Properties of In-situ Synthesized Discontinuous Particles Reinforced Titanium Matrix Composite
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摘要: 以海绵钛、镧粉、TiB2粉和石墨粉为原料，通过原位反应分别制备得到1%（体积分数，下同）La2O3、5%TiB+1%La2O3、5%TiC+1%La2O3等3种增强体增强钛基复合材料，研究了复合材料的显微组织和力学性能，并与相同工艺所得纯钛的进行了对比。结果表明：复合材料的基体组织为α-Ti，原位生成的La2O3呈颗粒状或短棒状，TiB呈短纤维状，并沿锻造方向排列，TiC呈等轴状和不规则形状；所得钛基复合材料的硬度、抗拉强度和屈服强度均显著高于纯钛的，断后伸长率低于纯钛的。Abstract: Titanium matrix composites reinforced with three reinforcements of 1vol%La2O3,5vol%TiB+1vol%La2O3 and 5vol%TiC+1vol%La2O3, respectively, were prepared by in-situ reactions with sponge titanium, lanthanum powder, titanium diboride powder and graphite powder as raw materials. The microstructure and mechanical properties of the composites were studied and compared with those of pure titanium prepared by the same process. The results show that the matrix microstructure of the composites consisted of α-Ti. The in-situ synthesized La2O3 was granular or short-rob like, the TiB was short-fiber like and distributed along the forging direction, and the TiC was equiaxed or irregular shape. The hardness, tensile strength and yield strength of the obtained titanium matrix composites were higher than those of the pure titanium, while the elongation was lower than that of the pure titanium.
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Keywords:
- titanium matrix composite /
- TiB /
- La2O3 /
- TiC /
- microstructure /
- mechanical property
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