Plastic Flow and Fracture of B2 NiAl-based Intermetallic Alloys Containing a Ductile Second Phase.

Noebe, Ronald D.; Misra, Amit; Gíbala, R.

doi:10.2355/isijinternational.31.1172

Cited by 88 publications

(40 citation statements)

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“…3(a)) because the deformation mechanism changes from <I l I> slip to climb of <100> and <110> dislocations. Ni-rich, cube-oriented Ni-40A1 crystals undergo a similar brittle-to-ductile transition but at approximately 1000 K (Noebe, Misra, and Gibala 1991).…”

Section: Ductility and Fracturementioning

confidence: 99%

“…The toughness and ductility of Ni-rich Ni-Al alloys can be increased best by the formation of a two-phase microstructure. In directionally solidified materials, room-temperature tensile ductilities of 10 percent have been achieved in a binary Ni-30A1 alloy consisting of aligned y' rods in a NiAI matrix (Noebe, Misra, and Gibala 1991). Conventionally processed, two-phase, polycrystalline Ni-Al alloys consist of a Ni 3Al necklace structure surrounding 6-grains, with fracture toughness increasing roughly proportional to the amount of y' phase present ( fig.…”

Section: Microstructural Modificationmentioning

confidence: 99%

“…As yet, a successful counterpart to this system has not been identified for NIAI, though significant work is ongoing in this area. Because the development of two-phase NiAI-based alloys has been reviewed previously (Noebe, Misra, and Gibala 1991), only a brief discussion centering on more recent advances is presented.…”

Section: Microstructural Modificationmentioning

confidence: 99%

See 2 more Smart Citations

The Physical and Mechanical Metallurgy of NiAl

Noebe¹,

Bowman²,

Nathal³

1996

Physical Metallurgy and Processing of Intermetallic Compounds

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Section: Ductility and Fracturementioning

confidence: 99%

Section: Microstructural Modificationmentioning

confidence: 99%

See 1 more Smart Citation

The Physical and Mechanical Metallurgy of NiAl

Noebe¹,

Bowman²,

Nathal³

1996

Physical Metallurgy and Processing of Intermetallic Compounds

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“…One of the most promising intermetallic compounds will be nickel monoaluminide, NiAl, which offers many advantages over conventional superalloys, such as higher melting point, lower density, greater specific modulus and higher thermal conductivity. [1][2][3] However, it is reported that due to its poor ductility below approximately 800 K, joining of NiAl by a conventional fusion welding process is difficult. [4][5][6] Therefore, in order to fully utilize NiAl in structural applications, joining methods appropriate to NiAl will be required.…”

Section: Introductionmentioning

confidence: 99%

Padding, Welding and Freeform Fabrication of Nickel Aluminide Intermetallic Compound by Reactive Rapid Prototyping Process

et al. 2002

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A novel method for padding, welding and freeform fabrication of intermetallic alloys based on an exothermic synthesis reaction between powder and droplets is proposed, and its feasibility is examined using nickel monoaluminide, NiAl, as a demonstration material. In an experiment for NiAl padding on steel, a small amount of nickel powder was fed onto a steel surface, followed by supplying an aluminum droplet onto the powder. The nickel and aluminum exothermically reacted and produced a NiAl bead on the steel surface, bringing about strong bonding between the NiAl bead and the steel. In an experiment for welding of NiAl, when an aluminum droplet was dropped onto nickel powder fed into a root gap between two NiAl base metals, they exothermically reacted and produced a molten NiAl bead. The heat from the reaction melted the base metals near the interface with the molten NiAl bead. After solidification of the molten NiAl bead and the melted parts of the base metals, welding of the base metals was completed. In an experiment for freeform fabrication of NiAl, when an aluminum droplet was dropped onto a nickel powder bed, the two metals reacted and produced a small NiAl bead. When a next droplet was fallen to a position very close to the NiAl bead, a new NiAl bead was similarly produced and was bonded to the former one. By continuous dropping of aluminum droplets a two-dimensional structure of the NiAl beads was configurated. After the two-dimensional structure was finished, nickel powder was added until it wholly covered the structure on the former plane, and then a new structure was similarly configured in the added nickel powder bed. The NiAl beads were bonded to each other in both horizontal and vertical directions. Finally, a three-dimensional structure was finished after repeating the addition of the powder and the supply of the droplet.

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“…[1][2][3][4][5] However, NiAl has very low ductility at temperatures below 600 K, which is one of the most significant disadvantages of NiAl and impedes the practical use of NiAl as a structural material. [6][7][8] Although the ductility of NiAl can be improved by reducing the grain size or alloying some elements, the degree of the improvement is not very remarkable.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of NiAl/Steel Cladding by Reactive Casting.

2000

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A novel joining process based on reactive casting is proposed. By pouring molten aluminum and nickel onto a steel block, molten nickel monoaluminide, NiAl, is exothermically synthesized, and is joined to the steel block when it solidifies on the steel block. Heat generated by an exothermic reaction, NiϩAl→ NiAlϩDH p298 , is transferred from the synthesized NiAl to the steel block, and the surface layer of the steel block is melted. The depth of the melted steel increases with both the preheating temperature of the steel block and the thickness of the synthesized NiAl. Iron from the melted steel dissolves in the molten NiAl, and an NiAl-base intermetallic compound, (Ni, Fe)Al, is produced. Cracks or other intermetallic phases such as NiAl 3 or FeAl are not formed at all at the joint interface between the (Ni, Fe)Al and the steel block. The synthesized (Ni, Fe)Al has an excellent resistance to corrosion and oxidation.

show abstract

Plastic Flow and Fracture of B2 NiAl-based Intermetallic Alloys Containing a Ductile Second Phase.

Cited by 88 publications

References 0 publications

The Physical and Mechanical Metallurgy of NiAl

The Physical and Mechanical Metallurgy of NiAl

Padding, Welding and Freeform Fabrication of Nickel Aluminide Intermetallic Compound by Reactive Rapid Prototyping Process

Fabrication of NiAl/Steel Cladding by Reactive Casting.

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