Relative stability of LI2, DO22, and DO23 structures in MAl3 compounds

Carlsson, Anders; Meschter, P. J.

doi:10.1557/jmr.1989.1060

Cited by 130 publications

(52 citation statements)

References 4 publications

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“…We expect this discussion to be valid for other alloys in the DO 22 structure. Also, previous calculations predicted that the stability of the DO 22 structure increases rapidly as the transition-metal d-electron count increases, 7 which has been demonstrated since the Fermi-level DOS is lower in Al 3 Nb and Al 3 Ta than that in Al 3 Ti.…”

Section: Spin-lattice Relaxationmentioning

confidence: 84%

“…7,8 Also the larger K iso occurring at site I indicates more s electrons at this site. However, K iso is not entirely due to s-like conduction electrons because of s-d mixing and chemical shifts, described below.…”

Section: Quadrupole Interaction and Knight Shiftmentioning

confidence: 99%

“…29 The long T 1 is related to DOS reduction at the Fermi level, which has been suggested to account for the DO 22 phase stability. [7][8][9][10] For the aluminum atom, the states near the Fermi level are predominately s and p like, the mixture of d states being rather small. Since p and d hyperfine fields are generally an order of magnitude smaller than s hyperfine fields, the main hyperfine field in such alloys arise from contact electrons.…”

Section: Spin-lattice Relaxationmentioning

confidence: 99%

“…Electronic structure calculations have been performed to understand the stable structures in some of these alloys. [7][8][9][10] The calculated total density of states ͑DOS͒ exhibited a deep valley at the Fermi level in the DO 22 structure, attributed to hybridization between Al-p and X-d playing an important role for the DOS reduction. Nevertheless, there has been little quantitative work associated with the local properties in these materials, essential to interpret their structural stability.…”

Section: Introductionmentioning

confidence: 99%

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NMR study of trialuminide intermetallics

Lue

Chepin²,

Chepin³

et al. 1998

Phys. Rev. B

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We present a systematic study of the DO 22 -structure trialuminide intermetallic alloys using 27 Al NMR spectroscopy. The quadrupole splittings, Knight shifts, and spin-lattice relaxation times on Al 3 Ti, Al 3 V, Al 3 Nb, and Al 3 Ta have been identified. Knight-shift tensors were isolated by observation of quadrupole satellite lines and fitting to the central-transition powder patterns. The results are associated with the local electronic density of states for each crystallographic site. Universally small isotropic Knight shifts and long T 1 's are consistent with low Fermi-surface densities of states indicating the importance of Fermi-surface features for the phase stability of these alloys. Larger anisotropic Knight shifts occurring at aluminum site I indicate strong hybridization at this site, and the electric-field-gradient tensors confirm the strong ab plane bonding configuration. Local-moment magnetism is found in Al 3 V, yet electrically this material appears very similar to the other DO 22 aluminides. ͓S0163-1829͑98͒07112-4͔

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Section: Spin-lattice Relaxationmentioning

confidence: 84%

Section: Quadrupole Interaction and Knight Shiftmentioning

confidence: 99%

Section: Spin-lattice Relaxationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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NMR study of trialuminide intermetallics

Lue

Chepin²,

Chepin³

et al. 1998

Phys. Rev. B

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“…However, their practical applications are limited because of high brittleness and poor ductility at room temperature. These undesirable properties are immediately related to the structural properties: Al 3 Sc crystallises in the cubic L1 2 structure, while Al 3 (Ti,V) adopt the tetragonal D0 22 structure [4][5][6]. The observed poor ductility is attributed to the insufficient number of slip planes in the tetragonal structure to satisfy the von Mises criterion for slip deformation of polycrystalline aggregates [7,8].…”

mentioning

confidence: 99%

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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A Critical Review on the Properties of Intermetallic Compounds and Their Application in the Modern Manufacturing

Paul

Mukherjee

Singh

2021

Crystal Research and Technology

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Advancement in modern manufacturing processes is allowing researchers to develop new alloy configurations for different applications to reduce weight and increase efficiency. Many alloy combinations are produced that randomly generate different phases of intermetallic compounds (IMCs) in the structure during manufacturing which show unique mechanical and chemical properties. But, the fundamental knowledge of different IMCs is scattered across the material research domain. Thus, in this review, the crystal structures of IMCs are thoroughly discussed which are having structural and functional applications. Furthermore, the issues associated with the dissimilar Fe‐Al, Fe‐Ni, and Ni‐Al systems via modern manufacturing processes such as arc additive manufacturing have been discussed. Moreover, detailed knowledge of ferro‐nickel, nickel‐aluminides, and ferro‐aluminides formed at the interface during the dissimilar deposition in modern manufacturing is provided. Currently, a few transition metal IMCs and some Heusler alloys, are the most promising and are used in applications. The addition of a third alloying element provides the broadening effect on the phase domain of a specific IMC. Furthermore, it has been observed that modern manufacturing processes such as additive manufacturing and others are new and advanced manufacturing technologies used for dissimilar metal deposition, which can control the IMCs in a more favorable direction.

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Relative stability of LI₂, DO₂₂, and DO₂₃ structures in MAl₃ compounds

Cited by 130 publications

References 4 publications

NMR study of trialuminide intermetallics

NMR study of trialuminide intermetallics

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

A Critical Review on the Properties of Intermetallic Compounds and Their Application in the Modern Manufacturing

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Relative stability of LI2, DO22, and DO23 structures in MAl3 compounds

Cited by 130 publications

References 4 publications

NMR study of trialuminide intermetallics

NMR study of trialuminide intermetallics

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

A Critical Review on the Properties of Intermetallic Compounds and Their Application in the Modern Manufacturing

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Product

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Relative stability of LI₂, DO₂₂, and DO₂₃ structures in MAl₃ compounds

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