期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2020.139924
关键词
Titanium matrix composites; Polycarbosilane; TiC; Mechanical properties
类别
资金
- Fundamental Research Funds for the Central Universities [FRF-TP-19005C1Z]
- National Natural Science Foundation of China [51874037, 51922004]
- State Key Lab of Advanced Metals and Materials, University of Science and Technology Beijing [2019-Z14]
In this work, we developed a powder conditioning process that involves coating polycarbosilane (PCS) on Ti particles. After sintering, the conditioned Ti powder was converted into Ti composites. TiC was derived from the pyrolysis of PCS and forming an in-situ reinforcement. There exists a specific orientation relationship of (111)(TiC )parallel to(10 (1) over bar0)(Ti); and [11 (2) over bar](TiC)parallel to[1 (2) over bar 10](Ti). The average grain size of alpha-Ti decreases significantly from 100.5 mu m in pure Ti to 16.1 mu m in the Ti-3 wt.% PCS composite. When the PCS content is 4 wt%, Ti3Si particles precipitate out, and they are combined with TiC forming an aggregated network architecture. Among these Ti composites, the 3 wt% PCS sample exhibits a high tensile strength of 861 MPa, high yield strength of 754 MPa and reasonably large elongation of 10.8%, respectively.
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