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Refining and toughening mechanism of Nb-16Si-20Ti-2ZrC-xY composite materials by constitutional supercooling and edge-to-edge model
- Source :
- Materials & Design, Vol 244, Iss , Pp 113175- (2024)
- Publication Year :
- 2024
- Publisher :
- Elsevier, 2024.
-
Abstract
- To explore the mechanism of the refinement and toughening of Nb-Si-based composites with different Y contents, Nb-16Si-20Ti-2ZrC-(0, 0.05, 0.1, 0.5) Y composites were prepared by arc melting. The results show that Y has a positive effect on the shift of the eutectic point and promotes it moving to the low Si side. Adding 0.1 at.% Y refines the Nbss phase from 38.7 to 11.2 μm. Y2O3 forms due to the strong affinity of Y to O. The edge-to-edge model predicted that there was no phase relationship between Y2O3 and Nbss and primary γ-(Nb,X)5Si3, which was verified by TEM. Y refines the Nbss and the Nbss/γ-(Nb,X)5Si3 cluster with compositional supercooling. As Y content increased, the fracture toughness at room temperature increased and decreased. When the Y content was 0.1 %, the KQ value reached 17.2 MPa·m1/2. The internal oxygen consumption of Y and the refinement of Nbss lead to the toughness improvement of the Nbss phase, promoting the formation of a large number of dimples. Microcracks form in the fine γ-(Nb,X)5Si3 of eutectoid cluster, which hinder the primary crack growth and enhance the ambient fracture toughness. These findings are of great significance for the further development of high-performance Nb-Si-based matrix composites.
Details
- Language :
- English
- ISSN :
- 02641275
- Volume :
- 244
- Issue :
- 113175-
- Database :
- Directory of Open Access Journals
- Journal :
- Materials & Design
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.36292287b8ec440f85b2fb9296b94208
- Document Type :
- article
- Full Text :
- https://doi.org/10.1016/j.matdes.2024.113175