Composition design, phase transitions of a new polycrystalline Ni-Cr-Co-W base superalloy and its isothermal oxidation dynamics behaviors at 1300 °C

Effect of Nanocrystalline Nickel Powder and Co, Mo, Ta, and Al Additions on Isothermal Oxidation Behavior of Ni–17Cr Alloy

“…Al 2 O 3 was detected when Al was added; in addition, Cr 2 O 3 and NiCr 2 O 4 were also observed, and these are known oxide formation for effective oxidation resistance at elevated temperature [27]. This further confirms the excellent oxidation resistance of the addition of Al.…”

“…The formation of protective spinels and oxides such as NiCr 2 O 4 , NiMoO 4 , Cr 2 O 3 , and Al 2 O 3 by these alloys offers them enhanced oxidation resistance. Similar spinels and oxides have been reported to enhance oxidation resistance of nickel-based superalloys[8,[25][26][27]. The formation of NiCr2O4 spinel on the surface of nickel-based alloys has been reported to enhance oxidation resistance, as this spinel noted for having smaller diffusion coefficients of anions and cations more than the constituents in their parent oxide[25].…”

“…This is due to the effect of milled nickel powder and nanocrystalline size nickel powder, which reduces the porosity level, and subsequently hinders the rate of inward and outward diffusion of oxidative elements. Figure 9 [8,[25][26][27]. The formation of NiCr2O4 spinel on the surface of nickel-based alloys has been reported to enhance oxidation resistance, as this spinel noted for having smaller diffusion coefficients of anions and cations more than the constituents in their parent oxide [25].…”