Journal
MATERIALS & DESIGN
Volume 162, Issue -, Pages 34-44Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2018.11.039
Keywords
Titanium matrix composite coatings; Hybrid TiB plus TiC reinforcements; Gas tungsten arc cladding; Microstructure; Hardness; Wear
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Funding
- National Key R&D Program of China [2017YFB0703100]
- National Natural Science Foundation of China (NSFC) [51822103, 51731009, 51671068]
- Fundamental Research Funds for the Central Universities [HIT.BRETIV.201902]
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For the sake of enhancing hardness and wear resistance of Ti based materials, 50 vol% (TiB + TIC)/Ti64 composite coatings with different TiB/TiC ratios were fabricated by gas tungsten arc cladding (GTAC) on the network structured 3.5 vol% TiBw (TiB whisker)/Ti64 substrate. The results showed that primary TiB and TiC exhibited much larger sizes than their eutectic counterparts, and the two-scale reinforcements formed by the dissolution precipitation mechanism predominated the hybrid coatings. In particular, most TiC was embedded within the TiB prism displaying an intergrowth structure with dissimilar-joining characteristic, which contributed to the hardness and wear resistance improvement. The remarkable hardness improvement was attributed to the following three-fold mechanisms: (a) load transfer strengthening from the primary TiB and TiC; (b) Orowan strengthening from the eutectics; and (c) Hall-Petch strengthening from the refined Ti64 matrix. Moreover, the plastic deformation resistance was significantly improved by the hybrid reinforcements, leading to the enhanced the anti-abrasion performance. Consequently, the coating exhibited a comparatively low wear rate (7.35 x 10(-5) mm(3) . N-1 . m(-1)) compared with the substrate (54.89 x 10(-5) mm(3) . N-1. m(-1)), and the corresponded wear mechanisms are summarized as: brittle debonding, oxidation and slight micro-ploughing. (C) 2018 Published by Elsevier Ltd.
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