TY - JOUR
T1 - Construction of an in-situ TiC and (TiZr)5Si3 dual-scale network hierarchical structure in titanium matrix composites and its effect on mechanical properties
AU - Wang, Qiang
AU - Zhang, Zhao Hui
AU - Jia, Xiao Tong
AU - He, Yang Yu
AU - Zhou, Jin Zhao
AU - Sun, Yuan Hao
AU - Cheng, Xing Wang
N1 - Publisher Copyright:
© 2025
PY - 2025/8
Y1 - 2025/8
N2 - In this study, the pyrolysis products of polycarbosilane were used as sources of carbon and silicon to synthesize (TiZr)5Si3 and TiC reinforcements, enhancing the performance of titanium matrix composites. By controlling the particle scale of the matrix alloy powders, the scale of the reinforcement network structure was successfully manipulated. The microstructural features and mechanical behavior of the (TiC+(TiZr)5Si3)/TA15 composite were systematically examined. The findings show that the (TiZr)5Si3 and TiC reinforcements create a multi-scale hierarchical network structure within the composite, effectively inhibiting β grains coarsening. The TiC particles have an average size of approximately 3.1 μm, while the (TiZr)5Si3 particles are around 95 nm in size. Relative to pure TA15 alloy, the β grains were refined from 474.7 μm to 40.6 μm. Moreover, the strength of the composite decreased as the network structure size increased, with the maximum yield strength reaching 1423 MPa, a 47.3 % improvement over the TA15 matrix. Meanwhile, the maximum hardness reaches 402.1 HV, corresponding to a 15.8 % increase compared to the TA15 matrix. This improvement primarily results from the refined grains and the uniform dispersion of reinforcements, while the composite's plasticity remained nearly unaffected by the network structure dimensions.
AB - In this study, the pyrolysis products of polycarbosilane were used as sources of carbon and silicon to synthesize (TiZr)5Si3 and TiC reinforcements, enhancing the performance of titanium matrix composites. By controlling the particle scale of the matrix alloy powders, the scale of the reinforcement network structure was successfully manipulated. The microstructural features and mechanical behavior of the (TiC+(TiZr)5Si3)/TA15 composite were systematically examined. The findings show that the (TiZr)5Si3 and TiC reinforcements create a multi-scale hierarchical network structure within the composite, effectively inhibiting β grains coarsening. The TiC particles have an average size of approximately 3.1 μm, while the (TiZr)5Si3 particles are around 95 nm in size. Relative to pure TA15 alloy, the β grains were refined from 474.7 μm to 40.6 μm. Moreover, the strength of the composite decreased as the network structure size increased, with the maximum yield strength reaching 1423 MPa, a 47.3 % improvement over the TA15 matrix. Meanwhile, the maximum hardness reaches 402.1 HV, corresponding to a 15.8 % increase compared to the TA15 matrix. This improvement primarily results from the refined grains and the uniform dispersion of reinforcements, while the composite's plasticity remained nearly unaffected by the network structure dimensions.
KW - Mechanical properties
KW - Microstructure
KW - Spark plasma sintering
KW - Titanium matrix composites
UR - http://www.scopus.com/inward/record.url?scp=105003958518&partnerID=8YFLogxK
U2 - 10.1016/j.coco.2025.102437
DO - 10.1016/j.coco.2025.102437
M3 - Article
AN - SCOPUS:105003958518
SN - 2452-2139
VL - 57
JO - Composites Communications
JF - Composites Communications
M1 - 102437
ER -