Titanium diboride–nickel graded materials prepared by field-activated, pressure-assisted synthesis process
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The formation of four-layered functionally graded material (FGM) samples of TiB2–Ni/TiB2–Ni3A + Ni/Ni3Al/Ni by field-activated, pressure-assisted synthesis process (FAPAS) was investigated. The microstructure, phase composition of the interfaces, and mechanical properties of the graded material were characterized. Elemental concentration profiles across interfaces between layers showed significant interdiffusion, indicative of formation of good bonds. The measured microhardness values of the sample increased monotonically from the nickel substrate to the surface layer (TiB2–Ni). The values ranged from about 360 to over 3500 HK over a distance of 2 mm. The results of this investigation demonstrate the feasibility of the FAPAS process for rapid formation of FGMs with good diffusion bonds.
KeywordsNi3Al Functionally Grade Material Titanium Diboride Knoop Hardness Nickel Substrate
This study works were supported by the projects of the NSFC of China (50671070). The work was also partially supported by a grant from the Army Office of Research (ZAM).
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