Alloying effect on microstructure and mechanical properties of thermomechanically processed Ni₃(Si,Ti) alloys

Pitting Corrosion of Ni3(Si,Ti) Intermetallic Compound at Various Chloride Concentrations

“…In addition, this compound was shown an excellent oxidation resistance in air at ambient and elevated temperatures (Kaneno et al, 2007). On the other hand, the compounds have shown to be suceptible to enviromental embrittlement (specifically hydrogen embrittlement) at ambient temperature in moisture in air and hydrogen gas (Kaneno et al,2011 ;Takasugi et al, 1993a ;Takasugi et al, 1993b). The addition of boron of Ni3(Si,Ti) was to suppres enviromental embrittlement (Takasugi et al, 1995), although the intergranular attack were observed for this as-homogenized Ni3(Si,Ti) compound (Priyotomo et al,2011) and Ni3(Si,Ti) compound after thermomechanical process (Priyotomo et al,2013) in acidic solutions, which took place by boron segregation at grain boundaries.…”

Pitting Corrosion of Ni3(Si,Ti)+4Al Intermetallic Compound at Various Chloride Concentrations

“…The nickel base intermetallic compounds such as Ni3(Si,Ti) with and without addition of Al, showing a high melting temperature, have advantages of lightweight and high-temperature oxidation resistance compared with conventional alloys such as steel and nickel-based alloys (Takasugi et al,1990 ;Kaneno et al, 2011 ;Kawahara et al, 2009). Therefore, those intermetallic compounds are as a candidate compound which could be used as hightemperature materials and chemical parts (Takasugi et al, 2002).…”

“…Therefore, those intermetallic compounds are as a candidate compound which could be used as hightemperature materials and chemical parts (Takasugi et al, 2002). On the other hand, an improvement in the mechanical property of the Ni3(Si,Ti) intermetallic compound was attempted with macro-alloying by adding aluminium (Al), which enhanced high-temperature tensile elongation at various operational temperatures (Kaneno et al,2011). Furthermore, the addition of Al in Ni3(Si,Ti) also improved the oxidation resistance at elevated operational temperatures (Kaneno et al,2011).…”

“…On the other hand, an improvement in the mechanical property of the Ni3(Si,Ti) intermetallic compound was attempted with macro-alloying by adding aluminium (Al), which enhanced high-temperature tensile elongation at various operational temperatures (Kaneno et al,2011). Furthermore, the addition of Al in Ni3(Si,Ti) also improved the oxidation resistance at elevated operational temperatures (Kaneno et al,2011). The Ni3(Si,Ti) with 4 at.% Al were composed of two regions of the L12 single-phase and a two phase mixture of L12 and Niss, where Niss was a fcc Ni solid solution (Kaneno et al, 2011).…”

“…Furthermore, the addition of Al in Ni3(Si,Ti) also improved the oxidation resistance at elevated operational temperatures (Kaneno et al,2011). The Ni3(Si,Ti) with 4 at.% Al were composed of two regions of the L12 single-phase and a two phase mixture of L12 and Niss, where Niss was a fcc Ni solid solution (Kaneno et al, 2011). Before performing electrochemical test, Gadang and co-workers also found that the main element of Ni was present uniformly, whereas Al, Ti and Si were enriched in the L12 single-phase region (Priyotomo et al, 2002).…”