| 掺杂方式对Mo—La合金断裂韧性及掺杂粒子显微结构的影响 |
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| 引用本文： | 马宝平.掺杂方式对Mo—La合金断裂韧性及掺杂粒子显微结构的影响[J].湖南有色金属,2010,26(2):31-33,70. |
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| 作者姓名： | 马宝平 |
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| 作者单位： | 金堆城钼业集团有限公司,陕西,西安,710068 |
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| 摘 要： | 分别采用液-固和液-液掺杂方式向钼粉中引入氧化镧，用粉末冶金方法烧结出Mo合金。通过透射电镜和扫描电镜研究了不同掺杂方式制备的Mo—La2O3材料中第二相颗粒的粒度分布、形貌，以及钼合金的断口形貌。试验结果表明液-液掺杂方法有利于细化、分散La2O3；液-液掺杂试样的断裂韧性优于液-固掺杂试样。并通过位错塞积理论讨论了La2O3的粒度分布对钼合金性能的影响。
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| 关 键 词： | 掺杂 断裂韧性 显微结构 掺杂粒子 Mo—La合金 |
Influences of Doping Methods on Fracture Toughness and Microstructure of Second Phase Particles of Mo-La2O3 |
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| MA Bao-ping.Influences of Doping Methods on Fracture Toughness and Microstructure of Second Phase Particles of Mo-La2O3[J].Hunan Nonferrous Metals,2010,26(2):31-33,70. |
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| Authors: | MA Bao-ping |
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| Affiliation: | MA Bao-ping ( Jinduicheng Molybdenum Co., Ltd, Xi ＇ an 710068, China) |
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| Abstract: | Mo- La2O3 powder was produced by liquid-liquid doping and liquid-solid doping respectively. Mo- La2O3 rods with a diameter of 17 mm were sintered at 1 840 ℃ for 6h in medium frequency induction furnace. The size distribution and feature of dopant particles and the fraetographs of Mo alloys were investigated by TEM and SEM respectively. Liquid-liquid doping can refine and disperse La2O3 grains sufficiently in Mo alloys, the shape of La2O3 grains are uniform,and the degree of deviation in particles size is low. Fracture toughness of Mo alloys prepared by liquid-liquid doping showed better results than that of liquid-solid doping. |
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| Keywords: | doping fracture toughness mierostructure dopant particles M o - La alloys |
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