Origin of nondetectable x-ray diffraction peaks in nanocomposite CuTiZr alloys

Jiang, J.Z.; Kato, Hidemi; Ohsuna, Tetsu; Saida, Junji; Inoue, Akihisa; Saksl, K.; Franz, H.; Ståhl, Kenny

doi:10.1063/1.1619220

Cited by 47 publications

(32 citation statements)

References 27 publications

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“…Although nanocrystals are clearly observed in the BF images, the SAED patterns show hallo without any sharp rings corresponding to the ring pattern for the fcc phase. This insensitivity to the crystallization in the diffraction was reported by Jiang et al 7) Although the as-spun ribbon was a single phase amorphous, a nanocrystalline microstructure was observed when the TEM specimen was prepared by ion milling without cooling by liquid nitrogen (data not shown here). This indicates that the temperature increase during ionmilling or ion beam irradiation induces nanocrystallization, so the previous report of nanocrystalline microstructure from the as-spun ribbon 6) may be due to the crystallization during ion milling.…”

Section: Resultsmentioning

confidence: 54%

Characterization of Nanocrystal Dispersed Cu60Zr30Ti10 Metallic Glass

et al. 2005

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The microstructures of Cu 60 Zr 30 Ti 10 metallic glass prepared by injection casting and melt-spinning have been investigated by transmission electron microscopy (TEM), and three dimensional atom probe (3DAP). The as-cast 2 mm diameter rod sample contained Cu-rich nanocrystals in the amorphous matrix, while the melt-spun ribbon was fully amorphous. The composition of the Cu-rich nanocrystals was around Cu 76 Zr 19 Ti 5 with the fcc structure (lattice parameter a ¼ 0:37 nm), which is a metastable Cu phase supersaturated with Zr and Ti. Annealing the as-cast rod at 713 K (T g ) for 10 min led to a decrease in compressive plastic strain from 1.8 to 0.6% accompanied by an increase in the volume fraction of the Cu-rich crystal.

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Section: Resultsmentioning

confidence: 54%

Characterization of Nanocrystal Dispersed Cu60Zr30Ti10 Metallic Glass

et al. 2005

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“…Up to now, there is only one paper [9], in which the Laves phase with lattice parameters a ¼ 0.5105 and c ¼ 0.8231 nm is reported, namely as a secondary phase in the alloy Zr 30 Ti 10 Cu 60. However, no chemical composition is given for the Laves phase.…”

Section: Introductionmentioning

confidence: 97%

Crystal structure, phase stability and elastic properties of the Laves phase ZrTiCu2

et al. 2008

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“…In this work, we shall illustrate this on the example of the ternary Cu 60 Ti 20 Zr 20 alloy which has been studied recently by experiment (see references in Refs. 5,[35][36][37][38][39][40] and simulation with parametrized potentials [41][42][43][44] for its importance as a model system of transition-metal-based BMGs, and its technological relevance. To our knowledge, this alloy has not been studied from first-principles simulation, in contrast with Cu-based binary alloys (see for example Refs.…”

Section: Introductionmentioning

confidence: 99%

Structure of the glass-forming metallic liquids by ab-initio and classical molecular dynamics, a case study: Quenching the Cu60Ti20Zr20 alloy

Amokrane

Ayadim

Levrel

2015

Journal of Applied Physics

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We consider the question of the amorphization of metallic alloys by melt quenching, as predicted by molecular dynamics simulations with semi-empirical potentials. The parametrization of the potentials is discussed on the example of the ternary Cu-Ti-Zr transition metals alloy, using as reference the ab-initio simulation. The pair structure in the amorphous state is computed from a potential of the Stillinger Weber form. The transferability of the parameters during the quench is investigated using two parametrizations: from solid state data, as usual, and from a new parametrization on the liquid structure. When the adjustment is made on the pair structure of the liquid, a satisfactory transferability is found between the pure components and their alloys. The liquid structure predicted in this way agrees well with experiment, in contrast with the one obtained using the adjustment on the solid. The final structure, after quenches down to the amorphous state, determined with the new set of parameters is shown to be very close to the ab-initio one, the latter being in excellent agreement with recent X-rays diffraction experiments. The corresponding critical temperature of the glass transition is estimated from the behavior of the heat capacity. Discussion of the consistency between the structures predicted using semi-empirical potentials and ab-initio simulation, and comparison of different experimental data underlines the question of the dependence of the final structure on the thermodynamic path followed to reach the amorphous state.

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Origin of nondetectable x-ray diffraction peaks in nanocomposite CuTiZr alloys

Cited by 47 publications

References 27 publications

Characterization of Nanocrystal Dispersed Cu<SUB>60</SUB>Zr<SUB>30</SUB>Ti<SUB>10</SUB> Metallic Glass

Characterization of Nanocrystal Dispersed Cu<SUB>60</SUB>Zr<SUB>30</SUB>Ti<SUB>10</SUB> Metallic Glass

Crystal structure, phase stability and elastic properties of the Laves phase ZrTiCu2

Structure of the glass-forming metallic liquids by ab-initio and classical molecular dynamics, a case study: Quenching the Cu60Ti20Zr20 alloy

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