钨骨架/Zr基非晶合金材料的静态力学行为

Study on the static mechanical behavior of tungsten skeleton /Zr based amorphous alloy composite material

  • 摘要: 利用渗流铸造法制备出直径为8mm、钨颗粒体积分数达40%的钨骨架/Zr基非晶合金复合材料,在室温下通过电子万能试验机对材料进行静态压缩实验。实验结果表明:材料在静态加载条件下屈服强度不具有应变率效应,其值基本保持不变; 材料塑性良好, 具有应变强化效应。通过扫描电子显微镜(SEM)技术对复合材料的原始组织和断裂特征、裂纹扩展等情况进行研究。发现复合材料断裂模式为一种混合断裂模式,在变形带间交界处发现若干裂纹。非晶基体阻碍了钨骨架中裂纹的扩展,钨骨架防止复合材料发生大范围的流变。

     

    Abstract: Tungsten skeleton/Zr-based amorphous composites were fabricated by melt infiltrating casting method. The samples are 6mm in diameter with the tungsten skeleton are 40% in volume fraction. They were tested by electronic universal testing machine at room temperature. The experimental results show that the static yield strength doesn't has strain rate effect, the vaule basically maintain unchanged. The composites has good plastic elongation as well as strain strengthening effect. The original structure and fracture characteristics as well as crack propagation etc were examined using scanning electron microscopy. The results show that the composites has complex fracture mode and some cracks appears on the junction of the deformation bands. The propagation of crack in tungsten skeleton is blocked by amorphous and the tungsten skeleton restricts the flow of amorphous.

     

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