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首页> 外文期刊>Materials Science and Engineering >Nano Mo-La-O particles strengthened Mo alloys fabricated via freeze-drying technology and low temperature sintering
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Nano Mo-La-O particles strengthened Mo alloys fabricated via freeze-drying technology and low temperature sintering

机译：纳米MO-LA-O颗粒加强通过冷冻干燥技术制造的MO合金，低温烧结

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摘要

This work proposed an innovative technology to fabricate Mo-La-O nanoparticles strengthened Mo alloys with ultrafine nano grains via freeze-drying and low temperature sintering. These novel nano Mo-La-O particles including La_7Mo_7O_(30), La_5Mo_3O_(16), La_6Mo_2O_(15), La_5Mo_4O_(12), La_4Mo_2O_(11) and La_2(MoO_6) remain coherent or semi-coherent interfaces with Mo matrix to strengthen their phase boundaries. Moreover, nano Mo-La-O particles enriched in excess oxygen absorb nearby impurity oxygen and then lead to the purification of Mo matrix. Furthermore, the low temperature sintered Mo-La_xMo_yO_z alloys possess high relative density (98.1%), which is due to the high sintering activities of ultrafine powders (56 nm). Comparing with available literature which involves oxide-dispersion-strengthened-molybdenum alloys (ODS-Mo), the freeze-dried Mo-La_xMO_yO_z alloys in our work possess the finest grain size (440 nm), the finest oxide particle size (mainly ＜5 nm), the highest hardness (495 HV_(0.2)) and high strength (1201 MPa) at 30% deformation.
机译：这项工作提出了一种创新的技术，用于通过冷冻干燥和低温烧结用超细纳米晶粒加强Mo-La-O纳米颗粒的创新技术。这些新型纳米MO-LA-O颗粒，包括LA_7MO_7O_（30），LA_5MO_3O_（16），LA_6MO_2O_（15），LA_5MO_4O_（12），LA_4MO_2O_（11），LA_4MO_2O_（11）和LA_2（MOO_6）保持与MO矩阵的相干或半相干接口加强他们的相界。此外，纳米MO-LA-O富含过量氧的颗粒吸收附近的杂质氧，然后导致MO基质的纯化。此外，低温烧结的Mo-La_xmo_yo_Z合金具有高相对密度（98.1％），这是由于超细粉末（56nm）的高烧结活性。与涉及氧化物分散的钼合金（ODS-MO）的可用文献相比，我们工作中的冷冻干燥的Mo-La_MO_YO_Z合金具有最好的粒度（440nm），最优质的氧化物粒径（主要是<5 NM），最高硬度（495 HV_（0.2））和高强度（1201MPa），变形30％。

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  • 来源
    《Materials Science and Engineering》 |2021年第22期|141448.1-141448.6|共6页
  • 作者

    Weiqiang Hu; Lei Wang; Zongqing Ma; Liming Yu; Yongchang Liu;

  • 作者单位

    State Key Laboratory of Hydraulic Engineering Simulation and Safety School of Materials Science and Engineering Tianjin University Tianjin 300072 China;

    China Petroleum Engineering Corporation Project Management Company Beijing 100000 China;

    State Key Laboratory of Hydraulic Engineering Simulation and Safety School of Materials Science and Engineering Tianjin University Tianjin 300072 China;

    State Key Laboratory of Hydraulic Engineering Simulation and Safety School of Materials Science and Engineering Tianjin University Tianjin 300072 China;

    State Key Laboratory of Hydraulic Engineering Simulation and Safety School of Materials Science and Engineering Tianjin University Tianjin 300072 China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Mo-La_xMo_yOz_ alloys; Freeze-drying; Low temperature sintering; Ultrafine grains; High hardness;

    机译：mo-la_xmo_yoz_合金;冷冻干燥;低温烧结;超细谷物;高硬度;

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