Microstructural evolution of dual multi-phase intermetallic alloys composed of geometrically close packed Ni3X (X: Al and V) type structures

2007 ◽  
Vol 15 (3) ◽  
pp. 338-348 ◽  
Author(s):  
S. Shibuya ◽  
Y. Kaneno ◽  
H. Tsuda ◽  
T. Takasugi
Keyword(s):  
Microstructural Evolution ◽  
Intermetallic Alloys ◽  
Phase Intermetallic ◽  
Multi Phase

Microstructural Evolution of Dual Multi-Phase Intermetallic Alloys Composed of GCP Ni3Al and Ni3V Phases Containing Ti

2006 ◽  
Vol 980 ◽  
Author(s):  
Takayuki Takasugi ◽  
Yasuyuki Kaneno ◽  
Hiroshi Tsuda
Keyword(s):  
Aging Time ◽  
Microstructural Evolution ◽  
Microstructural Change ◽  
Intermetallic Alloys ◽  
Two Phase ◽  
Early Aging ◽  
Phase Intermetallic ◽  
Multi Phase ◽  
Interfacial Plane

AbstractThe microstructural evolution of intermetallic alloys, which have dual two-phase microstructure composed of Ni3Al (L12) and Ni3V (D022) phases, was investigated as a function of aging time at 1273K by TEM. At early aging time, the lower microstructure showed structurally decomposed clusters composed of L12 phase and three D022 variant structures. With proceeding aging time, the decomposed L12 and D022 phases coarsened and transformed to lamellar-like microstructures. At longer aging time, the L12 phase disappeared from the lamellar-like microstructure and alternatively the D022 phase composed of two different variant structures prevailed over the lamellar-like microstructures. Corresponding to this microstructural change, the direction of the lamellar and its interfacial plane rotated from <001> to <011> and from {001} to {011}, respectively.

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

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.

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

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.

Microstructure and Mechanical Properties of Dual Multi-Phase Intermetallic Alloys Composed of Geometrically Close Packed Ni3X Structures

2007 ◽  
Vol 561-565 ◽  
pp. 375-378
Author(s):  
Takayuki Takasugi ◽  
Yasuyuki Kaneno
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Tensile Ductility ◽  
High Yield ◽  
Intermetallic Alloys ◽  
Two Phase ◽  
Low Temperature Annealing ◽  
Wide Range ◽  
Phase Intermetallic ◽  
Multi Phase

Dual two-phase intermetallic alloys composed of geometrically close packed (GCP) structures of Ni3Al(L12) and Ni3V(D022) containing Nb were investigated in terms of the microstructural evolution during low temperature annealing (aging) and the related mechanical properties. The eutectoid region, i.e. the prior Al phase (Ni solid solution) is composed of the lamellar-like structure consisting of Ni3Al(L12) and Ni3V(D022) phases. The lamellar-like structure tended to align along <001> direction and on {001} plane in the prior A1 phase (or the L12 phase). In a wide range of temperature, the dual two-phase intermetallic alloys showed high yield and tensile strength, and also reasonable tensile ductility, accompanied with ductile fracture mode.

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