Mechanical behaviour of Al3Ti intermetallic and L12 phases on its basis

Milman, Yu.V.; Miracle, D.B.; Chugunova, S. І.; Voskoboinik, I.V.; Korzhova, N. P.; Legkaya, T.N.; Podrezov, Yu. N.

doi:10.1016/s0966-9795(01)00073-5

Cited by 116 publications

(75 citation statements)

References 25 publications

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“…Uniaxial compression along the PTP induces structural transformations to a stress-free bodycentred-cubic (B) and further to a face-centred tetragonal (T) phase. The bcc states B (1) are realised at strains of ε = −19.9% and ε = −20.4%, the structural energy differences are 96 meV and 35.1 meV for Al and Cu, respectively. The lattice constants of the bcc phases are a bcc = 3.240Å and a bcc = 2.890Å for Al and Cu (corresponding to an expansion of the atomic volume of 2.7% and 0.7%), respectively.…”

Section: Fcc Metals Under Uniaxial [100] Loadmentioning

confidence: 99%

“…The lattice constants of the bcc phases are a bcc = 3.240Å and a bcc = 2.890Å for Al and Cu (corresponding to an expansion of the atomic volume of 2.7% and 0.7%), respectively. The energy of the state B (1) represents a transition barrier to a stress-free face-centred tetragonal state T (1) realised at strains of ε = −30.8% and ε = −23.3%, at energies which are 69 meV and 34.7 meV higher than for the fcc phase for Al and Cu, respectively. Their lattice constants and axial ratios are a 1 = 2.799Å, a 3 /a 1 = a 2 /a 1 = 1.7701 and a 1 = 2.785Å, a 3 /a 1 = a 2 /a 1 = 1.493 Figure 2.…”

Section: Fcc Metals Under Uniaxial [100] Loadmentioning

confidence: 99%

“…Trialuminides of early transition-metal (TM) elements (Al 3 TM, TM=Sc, Ti, V) are of great technological interest because of their potential applications as light-weight high performance structural materials [1][2][3]. However, their practical applications are limited because of high brittleness and poor ductility at room temperature.…”

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confidence: 99%

“…Hill and Milstein [16] had been shown a bifurcation to a secondary deformation path with orthorhombic guiding symmetry can occur under strictly uniaxial loading at a special "invariant eigenstate", where the elastic moduli satisfy C 22 = C 23 . This special state is directly associated with an shear instability which is required for a departure from tetragonality in the absence of a transverse load 1 .…”

mentioning

confidence: 99%

“…For these metals it is known that the uniaxial tensile or compressive stresses required to initiate a transformation from bcc to fcc are two orders of magnitude lower than the hydrostatic pressures required to initiate this transition. Case (II) is realised e.g., for the 1 Note that the invariance condition has been formulated for uniaxial strain along [100] where C 22 = C 33 and C 12 = C 13 . Under uniaxial [001] loading where C 11 = C 22 and C 13 = C 23 the "invariance condition" reads C 11 = C 12 .…”

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confidence: 99%

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Response of fcc metals andL1₂andD0₂₂type trialuminides to uniaxial loading along [100] and [001]:ab initioDFT calculations

Jahnátek¹,

Krajčı́²,

Hafner³

2011

Philosophical Magazine

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Although the response of both pure fcc metals could be expected to be very similar, our results show a fundamental difference: whereas for Cu a special invariant state with C 22 = C 23 , leading to a bifurcation from the tetragonal to an orthorhombic deformation path, is reached at a strain of 10%, for Al this state is reached only at a strain of 33% close to the critical strain defining the ideal tensile strength. The reaction of the L1 2 -type trialuminides is comparable to the response of Al, no bifurcation to an orthorhombic deformation path is predicted.The response of the D0 22 -type trialuminides is different from that of the L1 2 -type phases because of the difference in the stacking of the atomic planes along the [001]. For D0 22 -type trialuminides, the uniaxial compression along this direction or epitaxial tension in the (001) leads to the formation of a stress-free D0 3 structure, in complete analogy to the fcc⇆bcc transformations observed for the pure metals. Under uniaxial [100] loading the guiding symmetry along the deformation path is orthorhombic and leads to the formation of special structures under both tension and compression parts, which are related to the D0 3 structure in the same way as the parent D0 22 -lattice to the L1 2 structure.

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Section: Fcc Metals Under Uniaxial [100] Loadmentioning

confidence: 99%

Section: Fcc Metals Under Uniaxial [100] Loadmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Response of fcc metals andL1₂andD0₂₂type trialuminides to uniaxial loading along [100] and [001]:ab initioDFT calculations

Jahnátek¹,

Krajčı́²,

Hafner³

2011

Philosophical Magazine

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Tailoring Materials Properties by Accumulative Roll Bonding

et al. 2010

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Accumulative roll bonding (ARB) as a method of severe plastic deformation (SPD) is an interesting established process to produce ultrafine‐grained (UFG) sheet materials with high potential for light weight constructions. The ARB process offers a high flexibility for tailored material design. Al2O3 particles, carbon fibers and titanium foils are used as reinforcement of aluminum sheets introduced during accumulative roll bonding. Furthermore multicomponent materials are produced by cladding of different aluminum alloys. These sandwich‐like structures allow to combine desired properties of the materials involved. Post‐ARB heat treatment offers another possibility for tailoring materials properties of graded structures as shown by formation of TiAl3 in Al/Ti laminates. The tailored materials are investigated by means of SEM, EDX, nanoindentation experiments and tensile testing.

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Uniting Strength and Toughness of Al Matrix Composites with Coordinated Al₃Ni and Al₃Ti Reinforcements

Heim

Zhang

2017

Adv Eng Mater

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Hybrid aluminum composites are fabricated in a novel manner to characteristically induce a layer‐wise aligned distribution of micro‐scale Al3Ni and Al3Ti intermetallic particles that are formed in situ within a ductile Al matrix. The simple and unique Rolling of Randomly Orientated Layer‐wise Materials (RROLM) manufacturing methodology enables microstructural tailoring of the intermetallic reinforcing particles to prescribe enhanced crack tip deflection caused by the complex interaction of local veins of reinforcement particles, in an effort to overshadow the classical loss of toughness in large‐particle reinforced composites. The complimentary reinforcements and their interface with the Al matrix are revealed to have a gradual transition zone that functions to maintain critical cohesion with the particles and the matrix, empowering the superior load transfer capability of the particles, and reducing microvoid penetration into the matrix. In situ three‐point bending observations combined with a local strain field analysis, demonstrate the distinctive crack deflection mechanisms exhibit by the composite. Deviating from the norm, this specialized particle reinforced composite exhibited both strengthening and toughening mechanisms simultaneously, over control samples. The investigated design strategy and model material will assist materials development toward light‐weight, stronger, and tougher particle reinforced Al matrix composites.

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Mechanical behaviour of Al3Ti intermetallic and L12 phases on its basis

Cited by 116 publications

References 25 publications

Response of fcc metals andL1₂andD0₂₂type trialuminides to uniaxial loading along [100] and [001]:ab initioDFT calculations

Response of fcc metals andL1₂andD0₂₂type trialuminides to uniaxial loading along [100] and [001]:ab initioDFT calculations

Tailoring Materials Properties by Accumulative Roll Bonding

Uniting Strength and Toughness of Al Matrix Composites with Coordinated Al₃Ni and Al₃Ti Reinforcements

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Mechanical behaviour of Al3Ti intermetallic and L12 phases on its basis

Cited by 116 publications

References 25 publications

Response of fcc metals andL12andD022type trialuminides to uniaxial loading along [100] and [001]:ab initioDFT calculations

Response of fcc metals andL12andD022type trialuminides to uniaxial loading along [100] and [001]:ab initioDFT calculations

Tailoring Materials Properties by Accumulative Roll Bonding

Uniting Strength and Toughness of Al Matrix Composites with Coordinated Al3Ni and Al3Ti Reinforcements

Contact Info

Product

Resources

About

Response of fcc metals andL1₂andD0₂₂type trialuminides to uniaxial loading along [100] and [001]:ab initioDFT calculations

Response of fcc metals andL1₂andD0₂₂type trialuminides to uniaxial loading along [100] and [001]:ab initioDFT calculations

Uniting Strength and Toughness of Al Matrix Composites with Coordinated Al₃Ni and Al₃Ti Reinforcements