Alloying Effect on the Electronic Structure of Ni<sub>3</sub>Al ( γ')

Morinaga, Masahiko; Yukawa, Natsuo; Adachi, Hirohiko

doi:10.1143/jpsj.53.653

Cited by 165 publications

(49 citation statements)

References 17 publications

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“…From the results of Figs. 9 and 10, a smaller difference between the Md and U6d levels results in a larger MSS, as previously reported by Morinaga et al (Morinaga et al, 1984(Morinaga et al, , 1985a. Namely, a smaller amount of CT between TM and γ-U provides a larger MSS for γ-U/ TM alloys.…”

Section: Correlation Between the MD (Or Effective Charges) And The Masupporting

confidence: 72%

“…Morinaga et al have first found that the d-electron energy (Md) plays an important role for the alloying behavior (Morinaga et al, 1984(Morinaga et al, , 1985a(Morinaga et al, , 1985b(Morinaga et al, , 1985c(Morinaga et al, , 1991(Morinaga et al, , 2005. In a similar manner, we have evaluated the Md of TMs in γ-U/ TM alloys from a weighted average of each component (d 3/ 2 and d 5/ 2 ), along with the U6d orbital energy.…”

Section: Relativistic Density-functional Methodsmentioning

confidence: 99%

“…In a similar manner, we have evaluated the Md of TMs in γ-U/ TM alloys from a weighted average of each component (d 3/ 2 and d 5/ 2 ), along with the U6d orbital energy. To compare Md values obtained for all TMs and U with each other, Md was shifted with respect to the Fermi level (E F ) of γ-U used as a reference (Morinaga et al, 1984(Morinaga et al, , 1985a.…”

Section: Relativistic Density-functional Methodsmentioning

confidence: 99%

“…To compare the difference in the electronic structure among the γ-U/ TM alloys, the MO energy level structure and chemical bonding of the alloys were examined (Kurihara et al, 2004). In the present works, the lattice relaxation in association with TM element substitution to γ-U solid was ignored, because the Md and OOP may not be affected significantly by the lattice relaxation (Morinaga et al, 1984(Morinaga et al, , 1985a(Morinaga et al, , 1985b. The lattice constant of γ-U crystal was taken from the experimental result of 6.659 au (Holden 1958).…”

Section: α-Uranium Metalmentioning

confidence: 99%

“…The Md has been found to play an important role of alloying for Ni 3 Al (Morinaga et al, 1984) and bcc Fe ( (Morinaga et al, 1985a). In this section, we first present the correlation between the maximum solid solubility (MSS) and Md for γ-U/ TM alloys (Kurihara et al, 2004(Kurihara et al, , 2008.…”

Section: Correlation Between the MD (Or Effective Charges) And The Mamentioning

confidence: 99%

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Relativistic Density – Functional Study of Nuclear Fuels

Kurihara¹,

Onoe²

2012

Advances in Nuclear Fuel

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Section: Correlation Between the MD (Or Effective Charges) And The Masupporting

confidence: 72%

Section: Relativistic Density-functional Methodsmentioning

confidence: 99%

Section: Relativistic Density-functional Methodsmentioning

confidence: 99%

Section: α-Uranium Metalmentioning

confidence: 99%

Section: Correlation Between the MD (Or Effective Charges) And The Mamentioning

confidence: 99%

See 3 more Smart Citations

Relativistic Density – Functional Study of Nuclear Fuels

Kurihara¹,

Onoe²

2012

Advances in Nuclear Fuel

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Development of Ni‐Based DS Superalloy with Excellent Oxidation Resistance and LCF Properties for Power‐Generation Gas Turbines

et al. 2012

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In advanced industrial gas-turbine systems, there is a great demand for a new, excellent superalloy which can be used for large gas-turbine blades. Because it is very difficult to produce a large-scale Ni-based Single Crystal (SC) blade, we have developed new Directionally Solidified (DS) superalloys with an excellent combination of high-temperature creep strength, lowcycle-fatigue strength, good oxidation resistance, castability and hot-corrosion resistance. In this study, three kinds of Ni-based DS superalloys were designed with the aid of the d-electrons concept. The chemical compositions of these alloys were in the range of 1.4%Ti, 8.2%Cr, 11%Co, (0-1.0)%Ru, 3.6%Ta, 9.2%W, 1.0%Re, 5.2%Al, 1.40%Hf and balanced Ni in weight percent (wt%). Creep rupture tests, hot-corrosion burner-rig tests, low-cyclefatigue tests and oxidation tests were conducted with heat-treated DS specimens of these alloys. Two of the designed alloys showed the same level of creep rupture life as those of the 2nd generation DS superalloys currently in wide use. Oxidation tests at 1313K proved that the oxidation resistance of all the designed alloys was superior to that of all the reference alloys. The results of the hotcorrosion burner-rig tests showed that all the designed alloys had better corrosion resistance than the 2nd generation DS superalloys. As for Low-Cycle-Fatigue (LCF) strength, it was found that even 0.6%Ru addition greatly improved LCF strength, and the 0.6%Ru containing Alloy-B showed better LCF strength than any commercially used reference DS superalloys. A casting test was accomplished in a model bucket of a first stage blade of a 25MWclass gas turbine.Alloy-B is potentially a suitable alloy for making gas turbine blades with prolonged lifetimes and low maintenance costs in recent 1500 °C-class or even higher class gas turbines for power generation.

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