通过真空非自耗熔炼工艺制备了不同SiCp添加量(0％,0.1％,0.4％,1.0％,质量分数)的近β钛合金.采用X射线衍射仪(XRD)、扫描电镜(SEM)、维氏显微硬度计和万能材料试验机,系统研究了SiCp添加量对近β钛合金显微组织及力学性能的影响规律.结果表明,不同SiCp添加量的近β钛合金主要由a-Ti、β-Ti和TiC所组成.近β钛合金的初生β晶粒尺寸取决于SiCp的添加量,SiCp添加量由0％增加到1％时,近β钛合金初生β晶粒尺寸由639 μm降低至323 μm.由于受细晶强化、TiC承载强化以及Si的固溶强化的影响,随着SiCp添加量的增加,近β钛合金的显微硬度、压缩强度有显著提高,而压缩率却明显降低.
A near beta titanium alloy reinforced with different mass fractions of SiCp was prepared by vacuum induction melting technology.The addition of SiCp was 0 wt％,0.1 wt％,0.4 wt％ and 1.0 wt％.Effect of SiCp addition on microstructure and mechanical properties of the near beta titanium alloy was investigated by XRD,SEM,Vicker's micro-hardness tester and Instron universal testing machine.Results show that the composite material with different SiCp addition is composed of a-Ti,β-Ti and TiC phase.The addition of SiCp refines prior β grain size obviously,which decreases from 639 to 323 μm with the addition of SiCp increasing from 0 to 1.0 wt％.Moreover,the near beta titanium alloy with addition of SiCp exhibits higher Vicker hardness and compression strength but worse plasticity compared with unreinforced titanium alloys.The composites exert the strengthening effects of both particulate reinforcements of TiC and Si elements through solid solution hardening and fine grain hardening.
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