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摘要: 通过固-液掺杂法在Mo-Re合金中加入稀土La2O3纳米颗粒制备得到Mo-Re-La合金, 将Mo-Re-La合金与Mo-Re合金、纯Mo的微观组织及力学性能进行对比研究, 得到如下结论: 在纯Mo中添加低含量Re元素(质量分数3.5%) 对Mo-Re合金有明显的细晶强化效果; 将La2O3纳米颗粒加入Mo-Re合金进一步细化和强化了Mo-Re-La合金。Abstract: Mo-Re-La alloys were prepared by solid-liquid doping method through adding La2O3 nanoparticles into Mo-Re alloys.Microstructures and mechanical properties of Mo-Re-La alloys, Mo-Re alloys, pure Mo were investigated.The results show that, the fine grain size strengthening of Mo-Re alloys is obvious by adding Re element into pure Mo in low mass fraction of 3.5%, and the Mo-Re-La alloys are further refined and strengthened by doping La2O3 nanoparticles into Mo-Re alloys.
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Key words:
- Mo-Re alloy /
- doping /
- nanoparticles /
- microstructures /
- mechanical property
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图 3 烧结试样断口相貌及能谱分析: (a) R0; (b) R35; (c) RL1
Figure 3. SEM morphology and EDS analysis of sintering samples: (a) R0; (b) R35; (c) RL1
图 4 La2O3纳米颗粒经压力加工后微观形貌
Figure 4. Microstructures of La2O3 nanoparticles after rolling
表 1 烧结试样化学成分与力学性能
Table 1. Chemical composition and mechanical properties of sintering samples
试样编号 合金主要元素质量分数/% 合金微量元素质量分数/×10-6 密度/(g·cm-3) 相对密度/% 洛氏硬度，HRA Re La Ca Mg Fe Si Al Cr O C R0 — — 7 1 28 12 4 8 50 23 9.95 97.50 50.60 R35 3.40 — 5 4 28 14 1 11 33 80 10.22 97.61 48.25 RL1 2.65 0.59 5 1 25 12 1 11 1150 90 10.26 99.50 50.50 
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表 2 钼合金室温拉伸性能
Table 2. Tensile properties of Mo alloys at room temperature
试样编号 热处理制度（厚0.5mm） 屈服强度/MPa 抗拉强度，Rm/MPa 断后伸长率，A/% R0 681 795 12.0 R35 850℃，40min 784 906 6.5 RL1 836 997 15.0 R0 603 720 10.0 R35 900℃，40min 757 906 7.0 RL1 790 939 22.0 R0 513 636 13.5 R35 950℃，40min 738 877 5.5 RL1 758 896 25.5
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