机械球磨热压烧结Mo-50%Cu合金的组织性能

Microstructure and Properties of Mo-50%Cu Alloy by Mechanical Milling and Pressure-Assisted Solid State Sintering

摘要:

采用机械球磨-真空热压固相烧结工艺制备Mo-50%Cu(质量分数, 下同)合金，研究机械球磨Mo/Cu复合粉末的组织形貌及热压烧结Mo-50%Cu合金的组织与物理、力学性能。结果表明：热压固相烧结工艺是制备高致密、高Cu含量Mo-Cu合金材料的有效途径；通过机械球磨可以显著细化Mo/Cu复合粉末及烧结态Mo-Cu合金中Mo相组元的尺寸并使其分布均匀化；获得的Mo-50%Cu合金中Mo相细小、均匀弥散分布于Cu基体中，既没有形成对导电性有较大负面影响的网络结构，又能充分发挥Mo相的弥散强化作用，因此，具有优异的物理与力学综合性能

Abstract:

Mo-50%Cu alloy was fabricated by mechanical milling and pressure-assisted solid state sintering under vacuum. Both the microstructure/morphology of the as-milled Mo/Cu composite powders and the microstructure and physical, mechanical properties of the as-sintered alloy were investigated. The results show that the pressure-assisted solid state sintering process is a feasible way to fabricate highly-densified Mo-Cu alloy product with high content of Cu. By mechanical milling, the Mo phases can be refined markedly and distributed more uniformly in the Mo/Cu composite powders and the as-sintered Mo-Cu alloy. For the Mo-50%Cu alloy fabricated by the present study, the Mo phases are found to be very fine and dispersed homogeneously in the Cu matrix, with no connecting skeleton structure of Mo observed. Therefore, the negative effect of Mo on the conductivity is weakened, and the strengthening effect of Mo is increased, resulting in a good combination of physical and mechanical properties