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采用快速热挤压技术对细晶93W-4.9Ni-2.1Fe-0.03Y%进行变形强化,研究了高应变率下挤压态细晶钨合金动态力学性能及失效行为。结果表明:在较低应变速率下的挤压态细晶钨合金的屈服强度相近,约2000 MPa;断面上的钨颗粒被严重拉长直至破碎,破碎的细小钨颗粒粘附在软化的粘结相中,随着应变率的增加钨颗粒变形更加明显;剖面观察发现:沿着断裂面的钨颗粒发生了高度的剪切变形,而内部区域则基本没有变形,表现出了剪切局域化迹象。实验结果证明了挤压态细晶钨合金在动态加载条件下的失效方式是绝热剪切失效。
The rapid hot extrusion technology was used to deform the fine grained 93W-4.9Ni-2.1Fe-0.03Y%. The dynamic mechanical properties and failure behavior of the as-extruded fine grained tungsten alloy at high strain rate were studied. The results show that the yield strength of the as-extruded fine grained tungsten alloy at a low strain rate is about 2000 MPa; the tungsten particles on the cross-section are severely elongated until they are broken; the broken fine tungsten particles adhere to the softened bond In the phase, the deformation of tungsten particles becomes more obvious with the increase of strain rate. The cross-section observation shows that the tungsten particles along the fracture surface have high shear deformation, while the inner region has almost no deformation, showing the shear localization sign. The experimental results show that the failure mode of the as-extruded fine grained tungsten alloy under dynamic loading is adiabatic shear failure.