Selecting high-temperature structural intermetallic compounds: The engineering approach

Anton, Donald L.; Shah, D. M.; Duhl, D. N.; Giamei, A. F.

doi:10.1007/bf03220324

Cited by 72 publications

(26 citation statements)

References 4 publications

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“…13 Structural instability of intermetallic phase during heavy plastic deformation has been partially ascribed to dislocations and defected interfaces created during straining. [14][15][16][17][18][19][20][21] Dislocations in intermetallic phases are preferably nucleated from phase boundaries because of interface ledges/steps and slip transmission from matrix into precipitates. [15][16][17][18] Dislocations crossing the precipitates may drag interstitial or vacancy atoms with them out of the precipitate.…”

Section: Introductionmentioning

confidence: 99%

“…[14][15][16]19 In situ straining experiments of Al-Al 2 Cu composites in a transmission electron microscope (TEM) have shown dislocations bypassing through Al 2 Cu plate-shaped precipitates by shear at multiple locations along the interphase boundaries. 14 Moreover, dislocations have been demonstrated experimentally to climb in intermetallic phase, 20,21 and provide rapid diffusion channels and adiabatic heating of the samples during plastic deformation 22,23 Nevertheless, glide dislocations and their reactions and non-conservative motion of dislocations are presumed to be responsible for structural instability of intermetallic phase.…”

Section: Introductionmentioning

confidence: 99%

“…MD simulations also demonstrated the easy gliding of a <001> dislocation on plane (110) at room temperature. In situ heating experiments of two-phase alloys performed inside a TEM indicate that the motion of dislocations in structural alloys often involves climb besides glide 20,21 associated with change in their cores. It is questionable whether the planar extended core <001> dislocation can climb, as the climb requires a very compact core structure for the dislocation.…”

Section: Introductionmentioning

confidence: 99%

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Dislocations interaction induced structural instability in intermetallic Al2Cu

et al. 2017

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Intermetallic precipitates are widely used to tailor mechanical properties of structural alloys but are often destabilized during plastic deformation. Using atomistic simulations, we elucidate structural instability mechanisms of intermetallic precipitates associated with dislocation motion in a model system of Al 2 Cu. Interaction of non-coplanar <001> dislocation dipoles during plastic deformation results in anomalous reactions-the creation of vacancies accompanied with climb and collective glide of <001> dislocation associated with the dislocation core change and atomic shuffle-accounting for structural instability in intermetallic Al 2 Cu. This process is profound with decreasing separation of non-coplanar dislocations and increasing temperature and is likely to be operative in other non-cubic intermetallic compounds as well.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dislocations interaction induced structural instability in intermetallic Al2Cu

et al. 2017

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“…4 and 5 indicate that the temperature of the reaction products did not reach even the melting point of NiAl, 1911 K, which is the highest melting point in nickel-aluminum binary system, be- cause many intermetallic phases including the reactant material existed in the bead. Those intermetallic phases are considered to be the intermediate products that appear in the process of the NiAl synthesis from nickel and aluminum.…”

Section: Padding 321 Effect Of Initial Temperature On Reactivitymentioning

confidence: 99%

“…[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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The Effect of Hydrogen on the Fracture Behavior of Aluminum Titanium Metal Matrix Composites

Solovioff

Eliezer

1994

Hydrogen Effects in Materials

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Selecting high-temperature structural intermetallic compounds: The engineering approach

Cited by 72 publications

References 4 publications

Dislocations interaction induced structural instability in intermetallic Al2Cu

Dislocations interaction induced structural instability in intermetallic Al2Cu

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

The Effect of Hydrogen on the Fracture Behavior of Aluminum Titanium Metal Matrix Composites

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