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Mo-Si-B三元系復合材料的制備及室溫斷裂韌性

Preparation and Room-Temperature Fracture Toughness of Mo-Si-B Ternary System Composites

  • 摘要: 通過Mo,Si,B三種單質粉末原位合成熱壓的方法制備了成分為Mo-12Si-8.5B和Mo-28Si-8.5B的Mo-Si-B三元系復合材料.利用金相顯微鏡、金相偏光鏡、X射線衍射技術、掃描電鏡等對制備材料的組織進行了分析,研究了退火工藝對其組織的影響,測量了其室溫斷裂韌性,并對復合材料的增韌機制進行了初步的探討.

     

    Abstract: The alloys containing Mo-12Si-8.5B and Mo-28Si-8.5B respectively were prepared by the in-situ synthesis reaction of the elemental powders of Mo, Si and B by hot-pressing. The microstructures and the annealing processing were investigated by optical microscopy, polariscopy, scanning election microscopy (SEM), and X-ray diSractometry (XRD). The fracture toughness of the alloys at room temperature were determined to be 7.7 and 4.1 MPa·m1/2 respectively. The mechanism for toughening at ambient temperature was discussed.

     

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