High-strength Ti-base ultrafine eutectic with enhanced ductility

Das, J.; Kim, K. B.; Baier, F.; Löser, W.; Eckert, J.

doi:10.1063/1.2105998

Cited by 154 publications

(114 citation statements)

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“…It has been already reported that Ti 70.5 Fe 29.5 exhibits no plasticity under compression and usually breaks into multiple pieces under unconstrained geometry with a specimens aspect ratio of height: diameter of 2:1. 8 However, some plasticity can be obtained under constrained geometry. 13 Furthermore, it has been reported that addition of Sn refines the interlamellar spacing of Ti 70.5 Fe 29.…”

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“…Recently, homogeneous ultrafine composites without any micrometer-size second phase dispersions has been developed in Ti-Fe-Sn, 8,9 Fe-Nb-Al, 10 and Ni-Zr alloys. 11 The deformation mechanism on the improvement of plasticity has been explained due to the change in morphology of the phases upon ternary alloy additions, 9 which helps formation of large number of shear bands, 8,9,12 their rotation 10,11,13 or phase transition. 14 In this letter, we report on the microstructure evolution in differently deformed Ti 68.38 Fe 28.61 Sn 3 ultrafine composites to explore the mechanism of plastic deformation.…”

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“…5 and improves the plasticity. 8,12,16 The microstructure evolution upon deformation has been studied under SEM to reveal the mechanism of plastic deformation. The formation of profuse slip traces has been identified in β-Ti and FeTi in case of all the differently deformed specimens.…”

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Origin of plasticity in ultrafine lamellar Ti-Fe-(Sn) composites

Maity

Das

2012

AIP Advances

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Transmission electron microscopic studies of eutectic Ti68.38Fe28.61Sn3 upon 5% and 10% plastic deformation reveal slip transfer across the β-Ti/FeTi lamellae interface. Stroh's analysis suggests that addition of Sn to Ti70.5Fe29.5 increases the cleavage stress and reduces the slip stress around a dislocation pile-up at β-Ti/FeTi interface. The presence of ultrafine lamellar FeTi contributes strengthening whereas, dislocation slip is the origin of plasticity in high strength Ti-Fe-(Sn) composites

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Origin of plasticity in ultrafine lamellar Ti-Fe-(Sn) composites

Maity

Das

2012

AIP Advances

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“…FeTi is a thermodynamically stable [10][11][12] nonmagnetic [13] intermetallic compound with a bcc-based B2 structure and a melting point of approximately 1600 K. FeTi is of interest for its hydrogen absorption capabilities [14][15][16] and for its mechanical properties [17,18]. It has been the subject of a large number of experimental and theoretical studies including inelastic neutron scattering [19,20] and first-principles calculations [21][22][23].…”

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“…Recently a novel temperature-induced ETT has been reported to alter magnetoresistivity [9]. In this Letter, we show through first-principles calculations and ancillary experiments how a thermally driven ETT drives anomalous changes in phonon dynamics.FeTi is a thermodynamically stable [10-12] nonmagnetic [13] intermetallic compound with a bcc-based B2 structure and a melting point of approximately 1600 K. FeTi is of interest for its hydrogen absorption capabilities [14][15][16] and for its mechanical properties [17,18]. It has been the subject of a large number of experimental and theoretical studies including inelastic neutron scattering [19,20] Forces and atomic configurations in the AIMD simulations were used to compute phonon energies at different temperatures with the temperature-dependent effective potential (TDEP) method [47,48], in which a model HamiltonianĤ…”

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Thermally Driven Electronic Topological Transition in FeTi

et al. 2016

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Ab initio molecular dynamics, supported by inelastic neutron scattering and nuclear resonant inelastic x-ray scattering, showed an anomalous thermal softening of the M − 5 phonon mode in B2-ordered FeTi that could not be explained by phonon-phonon interactions or electron-phonon interactions calculated at low temperatures. A computational investigation showed that the Fermi surface undergoes a novel thermally driven electronic topological transition, in which new features of the Fermi surface arise at elevated temperatures. The thermally induced electronic topological transition causes an increased electronic screening for the atom displacements in the M − 5 phonon mode and an adiabatic electronphonon interaction with an unusual temperature dependence. DOI: 10.1103/PhysRevLett.117.076402 An electronic topological transition (ETT), first identified by Lifshitz [1], occurs when changes to a metal cause new features to appear in the topology of the Fermi surface [2]. Structural, mechanical, and electronic properties are usually altered by an ETT, which can be induced by alloying [3][4][5] or pressure [6][7][8]. Recently a novel temperature-induced ETT has been reported to alter magnetoresistivity [9]. In this Letter, we show through first-principles calculations and ancillary experiments how a thermally driven ETT drives anomalous changes in phonon dynamics.FeTi is a thermodynamically stable [10-12] nonmagnetic [13] intermetallic compound with a bcc-based B2 structure and a melting point of approximately 1600 K. FeTi is of interest for its hydrogen absorption capabilities [14][15][16] and for its mechanical properties [17,18]. It has been the subject of a large number of experimental and theoretical studies including inelastic neutron scattering [19,20] Forces and atomic configurations in the AIMD simulations were used to compute phonon energies at different temperatures with the temperature-dependent effective potential (TDEP) method [47,48], in which a model HamiltonianĤis used to sample the potential energy surface at the most probable atom positions, where p i and u i are the momentum and displacement of atom i, respectively, andΦ ij is a second-order force constant matrix. The force constants from Eq. (1) were used to obtain phonon dispersions and phonon DOS curves at temperatures from 300 to 1500 K (Fig. 1). Thermal expansion causes phonons to soften with temperature, and this was accounted for by the quasiharmonic calculations presented in the Supplemental Material [33]. The AIMD calculations were performed without thermal expansion, so Fig. 1 shows the thermal effects from pure anharmonicity and from the adiabatic EPI. These are significantly larger than the thermal softenings from quasiharmonicity reported in the Supplemental Material [33]. The nonadiabatic electron-phonon interaction (EPI) is well known from conventional superconductivity, where electrons are paired by phonons with wave vectors that span the Fermi surface [49,50]. With increasing temperature the PRL 117, 076402 (2016) P H Y S I C A L

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