In-situ crystalline Cr3C2 and amorphous SiO2 dual-particles reinforced NiCr-based composites

Autor: Guangmin Hu, Yanfeng Han, Sida Liu, Biao Yu, Wenqi Tang, Dong Li, Hui Xing, Xiangfa Liu, Jiao Zhang, Baode Sun
Jazyk: angličtina
Rok vydání: 2023
Předmět:
Zdroj: Materials & Design, Vol 230, Iss , Pp 111997- (2023)
Druh dokumentu: article
ISSN: 0264-1275
79246079
DOI: 10.1016/j.matdes.2023.111997
Popis: Strength and ductility of structural materials are mutually exclusive in general due to the strength-ductility trade-off. Using in-situ pyrolysis of polycarbosilane in NiCr powder green compacts, we fabricated NiCr-based composites with micro-sized crystalline Cr3C2 and amorphous SiO2 dual-particles. Tensile tests show that the NiCr-based composites have a combination of high strength and ductility with the yield strength, ultimate tensile strength and ductility as 449 MPa, 838 MPa and 20.5%, respectively. The amorphous SiO2 and crystalline Cr3C2 particles exhibit plastic deformation and transgranular fracture, respectively, under tensile stress. Besides solid solution strengthening, the generation and annihilation behavior of dislocations at amorphous/crystalline interface and the strain hardening of the ceramic particles by hindering the movement of dislocations mutually contributes to the combination of excellent strength and ductility of our composites.
Databáze: Directory of Open Access Journals
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