Alloy design for Al addition on microstructure and mechanical properties of Ni3(Si,Ti) alloy

Fujimoto, Yasunori; Kaneno, Yasuyuki; Yoshida, Mitsutoshi; Takasugi, Takayuki

doi:10.1016/j.msea.2011.01.083

Cited by 6 publications

(2 citation statements)

References 14 publications

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“…Furthermore, Ni3(Si,Ti) with 2 at.% Cr 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 as well as the Ni3(Si,Ti) with Mo and Al (Kaneno et al, 2011). In addition, it was also found that the addition Cr was slightly effective in improving hightemperature ductility property (Fujimoto et al,2011). On the Ni3(Si,Ti) with 2 at.% Cr, before conducting polarization test, Gadang and co-workers also found that the main element of Ni was present uniformly (Priyotomo et al,2012).…”

Section: Introductionmentioning

confidence: 95%

Pitting Corrosion of Ni3(Si,Ti)+2Cr Intermetallic Compound at Various Chloride Concentrations

2014

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The pitting corrosion of Ni3(Si,Ti) with 2 at% Cr containing two regions of a Ni3(Si,Ti) single-phase of L12 structure and a mixture phase of of (L12 +Niss) was investigated as function of chloride concentrations by using a polarization method, scanning electron microscope and energy dispersive X-Ray spectroscopy in neutral sodium chloride solutions at 293 K. The pitting corrosion of Ni3(Si,Ti) with and without the addition of aluminium and type C276 alloy were also studied under the same experimental condition for the comparison. The pitting potential obtained for the Ni3(Si,Ti) with 2 at% Cr decreased with increasing chloride concentration. The specific pitting potentials and the pitting potentials were decreased in the order of C276 alloy > Ni3(Si,Ti) > Ni3(Si,Ti) + 2Cr > Ni3(Si,Ti) + 4Al, which means that the pitting corrosion resistance of Ni3(Si,Ti) with 2 at% Cr was higher than Ni3(Si,Ti) with 4 at% Al, but lower than that of Ni3(Si,Ti). A critical chloride concentration of Ni3(Si,Ti) with 2 at% Cr was found to be higher than that of Ni3(Si,Ti) with at% Al. In addition, the presence of high concentration for oxygen indicates the occurrence of pit formation.

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Section: Introductionmentioning

confidence: 95%

Pitting Corrosion of Ni3(Si,Ti)+2Cr Intermetallic Compound at Various Chloride Concentrations

2014

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“…It has been actually reported by the present author's group that the mechanical and chemical properties of Ni 3 (Si,Ti) were improved by the addition of some quaternary elements. [13][14][15][16][17] Therefore, to predict the substitution behavior as well as the solubility limits of quaternary elements in Ni 3 (Si,Ti) is a critical issue to further improve mechanical and chemical properties of Ni 3 (Si,Ti).…”

Section: Introductionmentioning

confidence: 99%

Alloying Behavior of Quaternary Elements in Ni<SUB>3</SUB>(Si,Ti)

2011

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The thermodynamic treatment, which is based on the difference of heat of formation among three extreme cases for the substitution of a quaternary element X, was applied to predict the substitution behavior of quaternary elements in Ni 3 (Si,Ti). The heat of formation of a hypothetical ternary compound Ni 6 SiTi in which X elements substitute for relevant sites was calculated by using a geometric model based on an extended Miedema's theory. According to the prediction, Cr and W (6), Mn and Re (7), Fe and Os (8), Co and Ir (9), Pt (10), and Cu and Au (11) substitute for Ni atoms. Ge (14) substitutes for Si atoms. Zr and Hf (4), V, Nb, and Ta (5), Mo (6), and Al (13) substitute for Ti atoms. Ga (13) substitutes for Si or Ti atom. The prediction for Ta is consistent with the reported experimental result. Also, the solubility limits of quaternary elements for the Ti site in Ni 3 (Si,Ti) are ranked in the sequence of Ta > Nb > V > Hf > Zr, and correlated with the size misfit parameter between Ti and the quaternary element X, and the difference in heats of formation between Ni 6 SiTi and Ni 6 SiX.

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