Designing New Multi-Phase Intermetallic Materials Based on Phase Compatibility Considerations

Dual multi-phase intermetallic alloy, which is composed of Ni3Al(L12) and Ni solid solution (A1) phases at high temperature annealing and is additionally refined by a eutectoid reaction at low temperature annealing, according to which the Al phase is transformed into the Ni3Al(L12)+Ni3V(D022) phases, was prepared. High-temperature tension and creep test were conducted using single crystalline materials. The alloy with such a novel microstructure showed extremely high yield and tensile stresses with good temperature retention. The creep test conducted at high temperature showed extremely low creep rate and creep rupture time when compared with advanced Ni-based superalloys. The results obtained are promising for the development of a new-type of high-temperature structural materials.

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The effect of second-phase dispersions on mechanical property of Ni3Si based multi-phase intermetallic alloys

Materials Science and Engineering A ◽

10.1016/j.msea.2007.04.085 ◽

2008 ◽

Vol 476 (1-2) ◽

pp. 112-119 ◽

Cited By ~ 15

Author(s):

M. Fujita ◽

Y. Kaneno ◽

T. Takasugi

Keyword(s):

Mechanical Property ◽

Second Phase ◽

Intermetallic Alloys ◽

Phase Intermetallic ◽

Multi Phase

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Microstructures and Mechanical Properties in Ni3Si-Ni3Ti-Ni3Nb-Based Multi-Intermetallic Alloys

MRS Proceedings ◽

10.1557/proc-842-s2.5 ◽

2004 ◽

Vol 842 ◽

Author(s):

T. Takasugi ◽

K. Ohira ◽

Y. Kaneno

Keyword(s):

High Temperature ◽

Tensile Stress ◽

Oxidation Resistance ◽

Tensile Elongation ◽

Intermetallic Alloy ◽

Boron Addition ◽

Intermetallic Alloys ◽

Phase Intermetallic ◽

Si Content ◽

Multi Phase

ABSTRACTMicrostructure, high-temperature tensile deformation and oxidation property of Ni3Si-Ni3Ti-Ni3Nb multi-phase intermetallic alloys with a microstructure consisting of L12, D024 and D0a phases were investigated. The tensile stress as well as the tensile elongation of these multi-phase alloys increased with increasing Si content, i.e. the volume fraction of L12 phase in the wide range of test temperatures. 50-ppm boron addition to these multi-phase intermetallic alloys resulted in increased tensile stress and tensile elongation. The multi-phase intermetallic alloy with a high Si content had good oxidation resistance, and also the boron addition to this alloy resulted in enhanced oxidation resistance. From an overall evaluation of the properties examined, it was shown that the multi-phase intermetallic alloy, which has a high Si content and is composed of L12 matrix dispersed by D024 and D0a phases, had the most favorable properties as high-temperature mechanical and chemical materials.

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Microstructure and Mechanical Properties of Dual Two-Phase Intermetallic Alloys Composed of GCP Ni3Al and Ni3V Phases containing Nb

MRS Proceedings ◽

10.1557/proc-980-0980-ii05-27 ◽

2006 ◽

Vol 980 ◽

Author(s):

Wataru Soga ◽

Yasuyuki Kaneno ◽

Takayuki Takasugi

Keyword(s):

High Temperature ◽

Creep Test ◽

Alloy System ◽

High Yield ◽

Intermetallic Alloys ◽

Two Phase ◽

Electron Microscopies ◽

Compression Creep ◽

Phase Intermetallic ◽

Multi Phase

AbstractDual multi-phase intermetallic alloys composed of Ni3X (X: Al and V) containing Nb were developed, on the basis of the Ni3Al-Ni3Nb-Ni3V pseudo-ternary alloy system. The dual multi-phase intermetallic alloys were characterized by scanning electron and transmission electron microscopies. High-temperature compression and tension tests, and compression creep test were conducted. It was found that the dual multi-phase intermetallic alloys show high yield and tensile strength with good temperature retention, accompanied with reasonable tensile ductility. The compression creep test conducted at high temperature showed lower creep rate in the dual multi-phase intermetallic alloys than in conventional Ni-base superalloys. The obtained results are superior to the dual multi-phase intermetallic alloys containing Ti.

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