Microstructure and properties of in-situ synthesized (Ti3Al + TiB)/Ti composites by laser cladding
作者： Yueqiao Feng , Kai Feng , Chengwu Yao , Zhuguo Li , Junhao Sun
DOI: 10.1016/J.MATDES.2018.07.045
关键词:
摘要: Abstract (Ti3Al + TiB)/Ti composites were fabricated on Ti6Al4V substrates by laser cladding (LC) to improve the wear and high temperature oxidation resistance simultaneously. The microstructures of coatings analyzed; strengthening mechanisms studied; investigated compared with those substrates. results showed that mixed Ti AlB2 powder 4:1 weight ratio was optimized as best material system for process. During cladding, fully reacted in molten pool in-situ form Ti3Al TiB particles α-Ti matrix. Dispersion provided most significant effect hardness coating. coating obviously improved substrate because produced reinforcements well maintained good toughness due a sufficient amount soft friction coefficient decreased from 0.65 0.29 average loss 12.5% substrate. gains lower than under each condition, indicating improvement coatings. A layer TiO2 Al2O3 generated coated sample. Compared substrate, existence made structure denser adhesion more excellent, effectively hindering diffusion oxygen atoms.
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