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,2020,49(2):398~403.[Sun Shuyu,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.]
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
投稿时间:2019-07-11  修订日期:2019-09-14
中文关键词:  TC18钛基复合材料  辛纳拖曳力  组织细化规律  屈强比
基金项目:
中文摘要:
      使用原位自生法制备出四种TC18钛基复合材料,试验显示,热处理过程中随着增强体含量增加,β晶粒的合并速度加快,且β晶粒的尺寸分布标准差呈现下降的趋势。该组织现象和增强体对β晶界迁移的影响有关,本文揭示出增强体对晶界迁移钉扎能力的下降是导致该细化规律的首要原因。TiB和TiC摩尔比为4:1的复合材料在拉伸试验中塑性俱佳,但是屈强比却均高于0.96,且随着增强体含量增加呈现增加的趋势。拉伸过程中晶界对位错的吸收致使位错强化增加减缓,增强体加速了晶界对位错的吸收从而导致了上述结果,也正因为如此,晶粒细化对增韧作用的贡献会随着增强体含量增加而增加。
Effect of weight fraction of reinforcements on microstructure refinement and mechanical properties of in-situ synthesized TC18 Ti matrix composite
英文关键词:TC18 Ti matrix composite  Zener dragging force  Microstructure refinement law  Yield ratio
英文摘要:
      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.
作者单位E-mail
孙曙宇 台州学院 sun_shuyu@126.com 
吕维洁 上海交通大学材料学院  
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