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The mechanical properties of electrodeposited Ni-TiH2 composite coatings annealed at 1, 000°C were studied and discussed in terms of metallographic structure. The hardness and 0.2% proof strength of the annealed composite coatings increased from Hv 150 to Hv 300 and 260Mpa to 830Mpa, respectively with increasing Ti content in the coatings from 5.2at% to 10.3at%. It was considered that these increases were due to the multiplication effects of solid solution hardning based on solute Ti in the matrix, dispersion strengthening, and keeping of the matrix fine grains caused by the dispersion of fine particles produced by heat treatment. The annealed coatings having a structure of fine matrix grains and fine dispersed particles were formed in a short-time annealing (15min), and further, the structure and mechanical properties did not vary durring further annealing (20h). The ductility of the annealed coatings was improved to a greater extent as compared with that of as-deposited coatings.
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