Phase relation and microstructure in multi-phase intermetallic alloys based on Ni3Al–Ni3Ti–Ni3V pseudo-ternary alloy system

Nunomura, Y.; Kaneno, Yasuyuki; Tsuda, Hiroshi; Takasugi, Takayuki

doi:10.1016/j.intermet.2003.12.011

Cited by 92 publications

(67 citation statements)

References 21 publications

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“…[1][2][3][4] However, monolithic Ni 3 X-type intermetallic alloys have some drawbacks, poor ductility at room temperature, low creep strength at high temperature and so on. So-called Nibased dual two-phase intermetallic alloys [5][6][7][8][9][10][11][12][13] based on Ni 3 Al (L1 2 : a = 0.3572 nm) -Ni 3 V (D0 22 : a = 0.3542 nm and c/a = 2.036) pseudo-binary alloy system ( Fig. 1) 14) have a unique microstructure: the alloys with a hypereutectoid alloy composition exhibit a mono-phase microstructure of Ni solid solution (A1 phase) at temperatures below melting point and subsequently a two-phase microstructure of the cuboidal Ni 3 Al phase surrounded by the A1 phase with decreasing temperature.…”

Section: Introductionmentioning

confidence: 99%

“…The dual two-phase microstructures are highly coherent among the constituent phases (structures), and display high microstructural stability. 5,6,8,9) In addition, high-temperature mechanical properties (such as tensile and creep strength) of the Ni-based dual twophase intermetallic alloys were superior to those of many conventional superalloys. 7,9) Further improving the Ni-based dual two-phase intermetallic alloys is necessary to develop as next generation-type high temperature structural materials.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Si Addition on Microstructure and Mechanical Properties of Dual Two-Phase Ni3Al and Ni3V Intermetallic Alloys

2016

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The effects of Si addition on the microstructures and mechanical properties of dual two-phase Ni 3 Al and Ni 3 V intermetallic alloys with a composition of Ni 75 Al 9 V 13 Nb 3 (expressed by at%) were investigated, focusing on the substitution manner of Si for Ni, Al or V. Solubility limit of Si in the present microstructure was less than 2 at% Si irrespective of the substitution manner of Si for Ni, Al or V. The eutectoid microstructure in the channel region was degenerated when Si was substituted for V. Third-phase dispersions containing Nb, i.e., Ni 16 Si 7 Nb 6 (G phase: D8a) were present at grain boundaries of the alloys exceeding the solubility limit. In the alloy in which Si was substituted for Ni, unit cell volume of the constituent Ni 3 Al phase increased while that of the constituent Ni 3 V phase little changed. In the alloy in which Si was substituted for Al, unit cell volumes of both phases decreased. The alloys in which Si was substituted for Al or Ni hardened while the alloy in which Si was substituted for V softened. The hardening in the former alloys was attributed to solid solution hardening due to Si substituted for solvent atoms Ni, Al and/or V while the softening in the latter alloy was attributed to the degenerated eutectoid microstructure in the channel region. Also, it was shown that the third-phase dispersions little affected hardness as well as yield strength.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Si Addition on Microstructure and Mechanical Properties of Dual Two-Phase Ni3Al and Ni3V Intermetallic Alloys

2016

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“…Therefore these compounds have been used as precipitated phases, i.e., strengtheners in actually used nickel superalloys 4) and as constituent phases of Ni-base multi-phase intermetallic alloys recently developed by the present author's group. [5][6][7][8][9][10] The addition of third element to these binary Ni 3 M-type GCP compounds or alloying element to the constituent Ni 3 M phases in Ni-base multi-phase intermetallic alloys might modify not only the mechanical properties but also other properties such as oxidation or corrosion property. Therefore, to study substitution behavior or a solubility limit of alloying element in Ni 3 M-type GCP compounds is a critical issue to develop a new type of high-temperature structural material based on intermetallic compounds.…”

Section: Introductionmentioning

confidence: 99%

Alloying Behavior of Ni3M-Type Compounds with D0a Structure

2011

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The atom substitution preference of ternary additions in Ni 3 M-type GCP (geometrically close-packed) compounds with D0 a structure was determined from the direction of single-phase region of the GCP phase on the reported ternary phase diagrams. In Ni 3 Nb, Co and Cu preferred the substitution for Ni-site, Hf, Ta, Ti, V and W the substitution for Nb-site, and Fe the substitution for both sites. In Ni 3 Ta, Co, Cu, Fe, Ir, Mn and Re preferred the substitution for Ni-site, Mo and Nb the substitution for Ta-site, and Al and Cr the substitution for both sites. In Ni 3 Mo, Pd and W preferred the substitution for Ni-site, and Al, Nb, Ta, Ti and Zr the substitution for Mo-site. The thermodynamic model, which was based on the change in heat of formation of the host compound by a small addition of ternary solute, was applied to predict the atom substitution preference of ternary additions. The heat of compound formation used in the thermodynamic calculation was derived from Miedema's formula. Good agreement was obtained between the thermodynamic model and the result of the literature search. For Ni 3 Mo, with a small negative heat of formation, a weak binding force between the constituent elements is often enhanced by the addition of the ternary elements that substitute for Mo-site.

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“…Therefore these compounds have been used as precipitated phases, i.e., strengtheners in actually used nickel superalloys 3) and as constituent phases of Ni-base multi-phase intermetallic alloys recently developed by the present author's group. [4][5][6][7][8][9] The addition of ternary element to these binary Ni 3 X-type GCP compounds or alloying element to the constituent Ni 3 X phases in Ni-base multi-phase intermetallic alloys might modify not only the mechanical properties but also other properties such as oxidation or corrosion property. Therefore, to study a solubility limit or substitution behavior of alloying element in Ni 3 X-type GCP compounds is a critical issue to develop a new type of high-temperature structural material based on intermetallic compounds.…”

Section: Introductionmentioning

confidence: 99%

“…Those compounds have been used as constituent phases in the Ni-base multi-phase intermetallic alloys. [4][5][6][7][8][9] In this paper, we treat Ni 3 Nb. It is known that Ni 3 Nb is a Berthollide-type compound and its structure is stable to the melting point.…”

Section: Introductionmentioning

confidence: 99%

Alloying Behavior of Ni3Nb

2010

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The site preference of ternary additions in Ni 3 Nb (D0 a ) was determined from the direction of solubility lobes of the GCP phases which were available from the reported ternary phase diagrams and constructed in the present work. It was shown that Cr, Co and Cu preferred the substitution for Ni-site, Ti, V, Hf, Ta and W the substitution for Nb-site, and Fe the substitution for both sites. The thermodynamic model, which was based on the change in total bonding energy of the host compound by a small addition of ternary solute, was applied to predict the site preference of ternary additions. The bond energy of each nearest neighbor pair used in the thermodynamic calculation was derived from the heat of compound formation by Miedema's formula. The agreement between the thermodynamic model and the experimental result was excellent. From both experimental and theoretical results, both the transition and B-subgroup elements have two possibilities, i.e., the case of substitution for Ni-site or the case of substitution for Nb-site, depending on the relative value of two interaction energies.

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Phase relation and microstructure in multi-phase intermetallic alloys based on Ni3Al–Ni3Ti–Ni3V pseudo-ternary alloy system

Cited by 92 publications

References 21 publications

Effect of Si Addition on Microstructure and Mechanical Properties of Dual Two-Phase Ni<sub>3</sub>Al and Ni<sub>3</sub>V Intermetallic Alloys

Effect of Si Addition on Microstructure and Mechanical Properties of Dual Two-Phase Ni<sub>3</sub>Al and Ni<sub>3</sub>V Intermetallic Alloys

Alloying Behavior of Ni<SUB>3</SUB>M-Type Compounds with D0<SUB>a</SUB> Structure

Alloying Behavior of Ni<SUB>3</SUB>Nb

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