摘要
以Ti-6Al-4V(TC4)合金为基体,以TiC和TiB作为增强相,采用熔铸法制备不同体积分数增强相的钛基复合材料(TMCs),研究不同含量TiC、TiB对TC4组织与力学性能的影响。结果表明:随着增强相体积分数的提高,TiC、TiB衍射峰明显增强;α相层片的长度有所变短,层片的宽度也有一定的减小,且排列方向较不规则;TiB、TiC沿晶界分布,同时晶粒有细化的趋势。当增强相体积分数由0vol%增加到4vol%,复合材料的硬度升高,复合材料的抗压强度由1205 MPa增加到1602 MPa,提高了近400 MPa,但极限变形量有所降低,从24.5%降到16.7%,降低了约8%,即强度提高塑性降低。
Taking Ti-6Al-4V (TC4) alloy as matrix, and TiC and TiB as reinforcement, the titanium matrix composites (TMCs) with different volume fractions of reinforcement were prepared by melting-casting. The effects of TiC and TiB contents on the microstructure and mechanical properties of TMCs were studied. The results show that, the TiC and TiB diffraction peaks increase obviously with the increase of the volume fraction of the reinforcement. The length of α phase lamellar becomes shorter. The width of lamellar is also reduced, and the arrangement direction is relatively irregular. The reinforcement of TiB and TiC distribute along grain boundaries and the grain size tends to be refined. When the volume fraction of the reinforcing phase is increased from 0 vol% to 4 vol%, the hardness of the composites increases, and the compressive strength increases from 1205 MPa to 1602 MPa, which increases by nearly 400 MPa. However, the limit deformation decreases from 24.5% to 16.7%, which is decreased by 8%, that is, the strength increases and the plasticity decreases.
引文
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