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孙曙宇,吕维洁.增强体含量对原位自生TC18钛基复合材料微观组织及力学性能的影响[J].稀有金属材料与工程(英文),2020,49(2):398~403.[Sun Shuyu and Lv Weijie.Effect of weight fraction of reinforcements on microstructure refinement and mechanical properties of in-situ synthesized TC18 Ti matrix composite[J].Rare Metal Materials and Engineering,2020,49(2):398~403.]
Effect of weight fraction of reinforcements on microstructure refinement and mechanical properties of in-situ synthesized TC18 Ti matrix composite
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Received:July 11, 2019  Revised:September 14, 2019
DOI:
Key words: TC18 Ti matrix composite  Zener dragging force  Microstructure refinement law  Yield ratio
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Sun Shuyu and Lv Weijie  
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Abstract:
      Four different kinds of TC18 Ti matrix composites containing trace TiB and TiC are fabricated by in-situ synthesis method in this work. The experiments show that the merging of β grains is accelerated with increasing the reinforcements during heat treatment, and the standard deviations of β grain size distributions tend to decrease. The microstructure phenomenon is associated with the influence of the reinforcements on the boundary migration of β grains. It is revealed that the decrease of the pinning capability of the reinforcements on the grain boundary migration plays the most important role in the microstructure refinement law. The plasticities of the composites are excellent during tensile test. However, when the molar ratio of TiB to TiC in the composites is 4:1, the yield ratios of the composites are all higher than 0.96, and gradually increase with the increase of the reinforcements. The grain boundaries absorb the dislocations, which slows down the increase of dislocation strengthening during the strengthening process. It is suggested that the reinforcements accelerate the absorption of dislocations, and thus lead to this result. Just because of this, the contribution of the microstructure refinement to the toughness increases with the increase of reinforcements.