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通过添加不同质量分数(0.36%,0.72%,1.45%)的镧(La)和不同质量分数(0.17%,0.34%,0.68%)的硼(B)到Ti6Al4V基体合金,经过普通的真空自耗电弧熔炼和热锻技术成功制备了TiB+La2O3颗粒增强钛基复合材料,并对材料热处理后的显微组织和力学性能进行了分析。利用XRD对试样进行了物相分析,应用金相显微镜和扫描电镜对复合材料显微组织进行了观察,特别探讨了增强体的演变特征,测定了材料的室温力学性能和高温力学性能。结果表明,La、B的添加对复合材料的显微组织和力学性能的影响巨大,制备的复合材料表现出优异的力学性能,抗拉强度可提高148 MPa,能显著地强化基体合金。
By adding boron (B) with different mass fraction (0.36%, 0.72%, 1.45%) and different mass fraction (0.17%, 0.34%, 0.68%) to Ti6Al4V matrix alloy, The TiB + La2O3 particle reinforced titanium matrix composites were successfully prepared by arc melting and hot forging technique. The microstructure and mechanical properties of the composites were analyzed. The phase analysis of the samples was carried out by XRD. The microstructure of the composites was observed by optical microscope and scanning electron microscopy. The evolution characteristics of the reinforcements were discussed in detail. The room temperature mechanical properties and high temperature mechanical properties of the composites were measured. The results show that the addition of La and B has a great influence on the microstructure and mechanical properties of the composites. The prepared composites exhibit excellent mechanical properties, tensile strength can be increased by 148 MPa, and can significantly strengthen the matrix alloy.