Research on microstructure and mechanical properties of Ti(C0.5N0.5) particle reinforced Ti matrix composites
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摘要: 以纯Ti粉、Ti(C0.5N0.5) 颗粒为原料，采用粉末冶金工艺，制备了Ti(C0.5N0.5)颗粒增强钛基复合材料，研究了Ti(C0.5N0.5) 含量对钛基复合材料组织和力学性能的影响。结果表明：Ti(C0.5N0.5) 颗粒的添加，显著细化了钛基体的晶粒，晶粒形貌由粗大的柱状晶转变为细小的等轴晶；随着Ti(C0.5N0.5) 含量的增加，钛基复合材料的孔隙明显减少，致密度提高，钛基复合材料的硬度和屈服强度逐渐增加，但压缩应变逐渐减小。
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关键词:
- 钛基复合材料 /
- Ti(C0.5N0.5) 颗粒 /
- 粉末冶金 /
- 显微组织 /
- 力学性能
Abstract: Using pure Ti powder and Ti(C0.5N0.5) particles as raw materials, Ti(C0.5N0.5) particle reinforced Ti matrix composites were prepared by powder metallurgy process. The effects of Ti(C0.5N0.5) content on the microstructure and mechanical properties of titanium matrix composites were studied. The results show that the addition of Ti(C0.5N0.5) particles significantly refines the grain size of Ti matrix, and the grain morphology changes from coarse columnar grain to fine equiaxed grain. With the increase of Ti(C0.5N0.5) content, the porosity of Ti matrix composites decreases obviously, the density increases, and the hardness and yield strength of Ti matrix composites increase gradually, but the compressive strain decreases gradually. -
图 1 不同Ti(C0.5N0.5) 含量的钛基复合材料的XRD图谱
Figure 1. XRD patterns of Ti matrix composites with different Ti(C0.5N0.5) contents
图 2 不同Ti(C0.5N0.5) 含量的钛基复合材料的显微组织
Figure 2. Microstructure of Ti matrix composites with different Ti(C0.5N0.5) contents
图 4 不同Ti(C0.5N0.5) 含量的钛基复合材料的压缩应力-应变曲线
Figure 4. Compressive stress-strain curves of titanium matrix composites with different Ti(C0.5N0.5) contents
图 5 不同Ti(C0.5N0.5) 含量的钛基复合材料的硬度
Figure 5. Hardness of titanium matrix composites with different Ti(C0.5N0.5) contents
表 1 纯钛和钛基复合材料的原料配比
Table 1. Raw materials ratio of pure titanium and titanium matrix composites
材料编号 w(Ti)/% w(碳氮化钛)/% A（CP Ti） 100.0 0 B（TMC2） 97.0 3 C（TMC3） 94.0 6 D（TMC4） 91.0 9 
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表 2 不同Ti(C0.5N0.5) 含量的钛基复合材料实际密度和理论密度
Table 2. The actual density and theoretical density of Ti matrix composites with different Ti(C0.5N0.5) contents
材料编号 实际密度/(g·cm−3) 理论密度/(g·cm−3) 致密度/% A（CP Ti） 4.34 4.50 96.48 B（TMC2） 4.44 4.52 98.20 C（TMC3） 4.46 4.53 98.60 D（TMC4） 4.48 4.54 98.53
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表 3 不同Ti(C0.5N0.5) 含量的钛基复合材料的压缩性能
Table 3. Compression properties of titanium matrix composites with different Ti(C0.5N0.5) contents
材料编号 抗压屈服强度/MPa 抗压强度/MPa 压缩应变/% CP Ti 850.0 1849.3 41.2 TMC2 1430.2 2498.1 41.6 TMC3 1603.3 2473.3 33.9 TMC4 1710.1 2444.0 28.4
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