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研究变形量对挤压态钨合金动态力学行为的影响及钨合金绝热剪切带内的微观开裂行为。结果表明,加载方向垂直于纤维取向时,随变形量由0增加至40.8%,挤压态钨合金绝热剪切敏感性显著增大;由对钨合金绝热剪切带内微观组织的SEM观察可知,靠近绝热剪切带中心处出现在微裂纹且微裂纹萌生于W-M界面及W颗粒内部;进一步的TEM观察可知,剪切带内W-M界面处存在大量的位错塞积,W颗粒中则出现亚晶内部及沿亚晶界扩展的微裂纹。
The effect of deformation on the dynamic mechanical behavior of tungsten alloy and the microscopic cracking behavior in the adiabatic shear band of tungsten alloy were investigated. The results show that when the loading direction is perpendicular to the fiber orientation, the adiabatic shearing sensitivity of the as-extruded tungsten alloy increases with the deformation amount from 0 to 40.8%. The SEM observation of the microstructure in the adiabatic shear band of the tungsten alloy shows , Near the center of the adiabatic shear zone, the micro-cracks appear and the micro-cracks initiate in the WM interface and the interior of the W particles. Further TEM observations show that there are a large number of dislocated plug products at the WM interface within the shear band and W particles Subgrains and along the subgrain growth within the micro-cracks.