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氧化物掺杂对钼铼合金板材力学性能的影响

Effect of oxide doping on mechanical properties of molybdenum‒rhenium alloy plates

  • 摘要: 通过在钼铼合金中加入La2O3和ZrO2,研究了氧化物掺杂对烧结坯料相对密度以及最终轧制板坯室温力学性能的影响,比较了两种氧化物的不同作用。研究发现,掺杂氧化物可以明显降低合金粉末粒度、细化晶粒,掺杂ZrO2的钼铼合金晶粒尺寸最小,但会因晶型相变降低烧结坯的相对密度。轧制变形可以提高合金板材的硬度和强度,掺杂La2O3的钼铼合金可以获得更高的强度并且塑性几乎不变,掺杂ZrO2的钼铼合金则在强度提高的同时塑性降低。掺杂ZrO2的钼铼合金抗拉强度和屈服强度最大,分别为1034 MPa和888.2 MPa。

     

    Abstract: The La2O3 and ZrO2 were doped in the molybdenum‒rhenium alloys, the effects of oxide doping on the relative density of the sintered billets and the mechanical properties of the final rolled plates at room temperature were studied in this paper. The results show that, the doped oxide can significantly reduce the particle size of the alloy powders. The grain size of molybdenum‒rhenium alloys doped with ZrO2 is the smallest, but the relative density of the sintered billets is reduced due to the crystalline phase transformation. The rolling deformation can improve the hardness and strength of the alloy plates, the molybdenum‒rhenium alloys doped with La2O3 can obtain the higher strength with the plasticity almost unchanged, while the molybdenum‒rhenium alloys doped with ZrO2 show the increase of strength but the decrease of plasticity. The tensile strength and yield strength of the molybdenum‒rhenium alloys doped with ZrO2 are the highest, which are 1034 MPa and 888.2 MPa, respectively.

     

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