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Amorphous silica particles reinforced nickel matrix composites fabricated by in-situ pyrolysis of polycarbosilane.

Authors :
Hu, Guangmin
Han, Yanfeng
Wang, Yujie
Li, Dong
Xing, Hui
Zhang, Jiao
Sun, Baode
Source :
Journal of Alloys & Compounds. Oct2023, Vol. 960, pN.PAG-N.PAG. 1p.
Publication Year :
2023

Abstract

Microstructures and mechanical properties of Ni matrix composites reinforced with amorphous SiO 2 particles by in-situ pyrolysis of polycarbosilane (PCS) coated on Ni powders were studied in this paper. The submicron spherical amorphous SiO 2 particles instead of traditional SiC uniformly distributing in the composites result from the generated silicon source by PCS pyrolysis combined with oxygen impurity in the preparation. The prepared composites achieve high yield strength, 172 MPa, and ultimate tensile strength, 494 MPa, as well as outstanding ductility, total elongation 28.4 %, which is improved 13.9 %, 50.6 % and 160.6 % compared with those for pure Ni samples, respectively. The effects of solid solution strengthening, grain refinement strengthening, reinforcement particle strengthening and dislocations behavior of at amorphous/crystalline interface on the combination of high strength and ductility of the composites were discussed. [Display omitted] • Amorphous SiO 2 reinforced Ni matrix composites were fabricated by in-situ pyrolysis of polycarbosilane coated on Ni powders. • Amorphous SiO 2 instead of crystalline SiC formed by the combination of silicon generated in the pyrolysis with oxygen. • The composites exhibit a combination of excellent tensile strength and ductility. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
09258388
Volume :
960
Database :
Academic Search Index
Journal :
Journal of Alloys & Compounds
Publication Type :
Academic Journal
Accession number :
164857385
Full Text :
https://doi.org/10.1016/j.jallcom.2023.170968