Microstructure and corrosion properties of laser-melted deposited Ti2Ni3Si/NiTi intermetallic alloy

Laser surface modification of titanium alloys

“…SiC particles, in the range 30-100 mm have been found to partially dissolve, giving the same phases described in (ii), Fig. 12.7 , (iv) intermetallic coatings of Ti-Al (Garcia et al, 2002), developed on Ti alloys by laser processing as a means of improving high temperature properties, while Ti 2 Ni 3 Si-toughened by a ductile NiTi (Dong and Wang, 2008) has potential for improved corrosion and wear resistance, (v) a series of amorphous alloys (Inoue, 2000), based on rare-earth (R-E) oxides, with a high glass-forming ability (GFA). A Zr based amorphous alloy with the widest supercooled liquid region has an extremely high glass-forming ability and was applied by to coat CPTi using Zr based alloy powders, and (vi) laser nitriding to form a hard TiN surface layer ~5 mm, followed by dendrites, needles and quasi-spherical particles at lower depths in the melt pool, Fig.…”

“…The un-lubricated coating showed a lower m, 0.17-0.25, than that of the amorphous alloy, ~0.52, while the predominant wear mechanisms were abrasion and peeling. A series of papers Wang and Liu, 2002;Dong and Wang, 2008) have highlighted the combination of excellent tribological and corrosion properties of a multiphase structure consisting of a brittle Laves phase Ti 2 Ni 3 Si, toughened by a ductile NiTi phase. The properties were attributed to the chemical stability of the phases and their strong inter-atomic bonds.…”

Production of Rounded Reactive Composite Ti/Al Powders for Selective Laser Melting by High-Energy Ball Milling

“…A new perspective trend in R&D of AM technology is the use reactive composite powders as a precursor. [12][13][14][15] In this case, a mixture of components with a relatively low melting point is used as a feedstock, so that the mixture is allowed to react during the SLS or SLM process to yield a refractory compound. If the reaction is exothermic, the reaction heat is added to that of laser heating.…”

Corrosion behaviors of (Cr,Fe)3Si/Cr13Fe5Si2 composite coating under condition of synergistic effects of electrochemical corrosion and mechanical erosion

“…Unfortunately, covalent bonding makes Cr 3 Si too brittle for industrial applications. Generally, production of a multi-phase structure and formation of ternary metal silicides are two feasible methods that can be used to improve the toughness of intermetallics [8,9]. To the best of our knowledge, there were no reports available in the literature with regard to the corrosion behaviors of metal silicides under condition of coupling effect of electrochemical corrosion and mechanical erosion.…”