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对粉末冶金法制备的两种不同钨含量的钨合金材料进行SHPB试验和原位拉伸试验,研究了钨合金中钨含量与其显微组织、断裂方式及力学性能之间的关系。结果表明,在拉伸情况下随着钨含量的增加,钨合金的破坏方式由W-W间开裂转变为钨颗粒开裂,材料由韧性变为脆性。利用Ostwald烧结理论,对两种材料的微观结构进行预测,结果与实验符合较好。利用细观力学模型对所观察的实验结果进行了定量解释。烧结理论和细观力学相结合,可建立材料烧结条件、体积分数及力学性能之间的关系,为材料的设计、制备和力学性能的预测提供理论依据。
The SHPB and in-situ tensile tests of two tungsten alloys with different tungsten contents prepared by powder metallurgy were carried out to study the relationship between tungsten content and the microstructure, fracture mode and mechanical properties of the tungsten alloy. The results show that with the increase of tungsten content, the failure mode of tungsten alloy changes from cracking of W-W to cracking of tungsten particles, and the material becomes ductile from ductility. Using the Ostwald sintering theory, the microstructures of the two materials are predicted. The results are in good agreement with the experimental results. The meso-mechanics model was used to quantitatively explain the observed experimental results. Sintering theory and mesomechanics combined to establish the material sintering conditions, volume fraction and mechanical properties of the relationship between the material for the design, preparation and mechanical properties to provide a theoretical basis for prediction.