材料科学
蠕动
极限抗拉强度
复合材料
位错
微观结构
复合数
钛
压力(语言学)
冶金
语言学
哲学
作者
Yunfei Zheng,Lijuan Xu,Dazhao Chi,Zhiwei Liang,Shiwei Han,Xiang Xue,Shulong Xiao,Jing Tian,Yuyong Chen
标识
DOI:10.1016/j.msea.2022.144279
摘要
In this paper, the microstructure characterization, tensile properties and creep behaviors under different temperature conditions of titanium matrix composites reinforced with 2 vol% and 4 vol% (TiB + TiC) were systematically studied. The results showed that two composites possessed the basket-weave structure with some equaixed-like α phases. The increased reinforcements reduced the length of the α lamellae and promoted the formation of TiB/TiC interfaces. The inergrowth TiB/TiC structures were stable in the tensile and creep process. Accompanied by the synergistic effect between TiB and TiC in TiB/TiC structure, the composite with higher reinforcement content possessed better tensile and creep properties under the given experimental conditions. In the creep process, α/β interfaces, reinforcements and silicides restricted the dislocation movement, promoting the dislocation rearrangement and the formation of sub-grains. The dislocation structure at 650 °C was mainly flat edge dislocations. Combined with the stress exponent, the dislocation climbing can be determined as the creep control mechanism. With the creep temperature increasing to 700 °C, the sub-grain size increased, and a large number of screw dislocations characterized by short jogs along the screw segments were observed.
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