Microstructures and mechanical properties of in situ TiC-ß-Ti-Nb composites with ultrafine grains fabricated by high-pressure sintering

Liu, Z, Zhang, D, Gong, L, Lin, J and Wen, C 2018, 'Microstructures and mechanical properties of in situ TiC-ß-Ti-Nb composites with ultrafine grains fabricated by high-pressure sintering', Scientific Reports, vol. 8, no. 1, pp. 1-9.


Document type: Journal Article
Collection: Journal Articles

Title Microstructures and mechanical properties of in situ TiC-ß-Ti-Nb composites with ultrafine grains fabricated by high-pressure sintering
Author(s) Liu, Z
Zhang, D
Gong, L
Lin, J
Wen, C
Year 2018
Journal name Scientific Reports
Volume number 8
Issue number 1
Start page 1
End page 9
Total pages 9
Publisher Nature Publishing Group
Abstract In this study, an in situ ß-Ti-Nb composites reinforced with TiC particles with an ultrafine grain size were fabricated using a powder metallurgical (PM) method. The microstructures and mechanical properties of the composites were characterized using X-ray diffraction (XRD) analysis, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and compression tests. TiC particles were formed in the ball-milled powders after annealing at 600 °C due to a chemical reaction between stearic acid and titanium. Using high-pressure sintering (HPS) on an apparatus with six tungsten carbide anvils, a fully dense ß-Ti-Nb composite reinforced with fine in situ TiC particles was obtained. The TiC particles exhibit particle sizes of ~500 nm, uniformly distributed in the composite matrix, which had grain sizes of ~600 nm. Thus, the TiC-ß-Ti-Nb composite show very high compression yield strength and relatively high plasticity contributed by grain refinement and TiC particles strengthening. The composite with 45 vol.% TiC exhibited excellent mechanical properties, with a yield compressive strength of 1990 MPa and plastic strain of 9.12%. More over, a modified rule-of-mixture (ROM) was presented to describe the combined strengthening effect of grain refinement and TiC particles.
Subject Biomaterials
Metals and Alloy Materials
DOI - identifier 10.1038/s41598-018-27535-6
Copyright notice © The Author(s) 2018. Creative Commons Attribution 4.0 International License
ISSN 2045-2322
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