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The mechanical properties of co-continuous Si_3N_4/Al composites manufactured by squeeze casting

机译：挤压铸造共连续Si_3N_4 / Al复合材料的力学性能

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摘要

The co-continuous S1_3N_4/Al composites with different Al contents were fabricated through the squeeze casting of porous Si_3N_4 preforms with varied porosities obtained by combination of pressureless sintering and carbothermal reduction. The effects of volume fraction of Al phase and the heat treatment temperature on the mechanical properties were investigated. When the volume percentage of Al increased from 24.13% to 70.23%, the Vickers hardness of the composite decreased from 762.33 to 175.09 Hv, the flex-ural strength decreased from 795.06 to 331.53 MPa and the fracture toughness increased from 3.66 to 11.52 MPa m~(1/2). The rod-like β-Si_3N_4 grains contributed to the fracture toughness of composites by pull-out, crack deflection and crack bridging. With an increase in the heat treatment temperature, the degree of interfacial reaction increased, the fracture modes changed from ductile intergranular fracture to brittle intergranular fracture.
机译：通过无压烧结和碳热还原相结合的多孔度不同的多孔Si_3N_4预成型坯的挤压铸造，制备了Al含量不同的共连续S1_3N_4 / Al复合材料。研究了Al相的体积分数和热处理温度对力学性能的影响。当Al的体积百分比从24.13％增加到70.23％时，复合材料的维氏硬度从762.33 Hv降低到175.09 Hv，抗弯强度从795.06 MPa降低到331.53 MPa，断裂韧性从3.66升高到11.52 MPa m〜 （1/2）。棒状β-Si_3N_4晶粒通过拉出，裂纹偏斜和裂纹桥接来提高复合材料的断裂韧性。随着热处理温度的升高，界面反应程度增加，断裂方式从韧性的晶间断裂变为脆性的晶间断裂。

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  • 来源
    《Materials Science and Engineering》 |2010年第23期|p.6289-6299|共11页
  • 作者

    Yuan Lu; Jianfeng Yang; Weizhong Lu; Rongzhen Liu; Guanjun Qiao; Chonggao Bao;

  • 作者单位

    State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China;

    rnState Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China;

    rnState Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China;

    rnState Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China;

    rnState Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China;

    rnState Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China;

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  • 正文语种 eng
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  • 关键词

    composites; squeeze casting; fracture modes; mechanical properties;

    机译：复合材料挤压铸造断裂模式机械性能;

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