Intergrowth microstructure and superior wear resistance of (TiB + TiC)/Ti64 hybrid coatings by gas tungsten arc cladding
作者： Qi An , Lujun Huang , Yang Jiao , Yang Bao , Bo Zhong
DOI: 10.1016/J.MATDES.2018.11.039
关键词:
摘要: Abstract For the sake of enhancing hardness and wear resistance Ti based materials, 50 vol% (TiB + TiC)/Ti64 composite coatings with different TiB/TiC ratios were fabricated by gas tungsten arc cladding (GTAC) on network structured 3.5 vol% TiBw (TiB whisker)/Ti64 substrate. The results showed that primary TiB TiC exhibited much larger sizes than their eutectic counterparts, two-scale reinforcements formed dissolution-precipitation mechanism predominated hybrid coatings. In particular, most was embedded within prism displaying an intergrowth structure “dissimilar-joining” characteristic, which contributed to improvement. remarkable improvement attributed following three-fold mechanisms: (a) load transfer strengthening from TiC; (b) Orowan eutectics; (c) Hall-Petch refined Ti64 matrix. Moreover, plastic deformation significantly improved reinforcements, leading enhanced anti-abrasion performance. Consequently, coating a comparatively low rate (7.35 × 10−5 mm3·N−1·m−1) compared substrate (54.89 × 10−5 mm3·N−1·m−1), corresponded mechanisms are summarized as: brittle debonding, oxidation slight micro-ploughing.
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