A new composition zone of bulk metallic glass formation in the Cu–Zr–Ti ternary system and its correlation with the eutectic reaction

Dai, Chunli; Hua, Guo; Li, Yang; Xu, Jie

doi:10.1016/j.jnoncrysol.2008.04.013

Cited by 29 publications

(17 citation statements)

References 31 publications

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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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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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“…Formation of BMGs in the Cu-rich Cu-Zr-Ti ternary system has been researched by Wang et al [10]; the BMGs on each composition line manifest decreased thermal stabilities and glass forming abilities with increasing Ti content. Dai et al [11] by Naoi et al [15] and its dealloying behavior has been analysed under free corrosion conditions [16] resulting in the idea, that dealloying metallic glasses may be a possible candidate for developing nanostructured metals. Moreover, Basu et al [17] have shown that Miedema's approach has been useful in determining the glass forming composition range for a particular alloy system (including the Cu-Zr-Ti system).…”

Section: Introductionmentioning

confidence: 99%

Atomic structure of Cu–Zr–Ti metallic glasses subjected to high temperature annealing

Durisin

Balga

Saksl

et al. 2014

Journal of Alloys and Compounds

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An influence of high temperature annealing process (before crystallization) on the atomic structure of two different as-prepared ribbon Cu-Zr-Ti metallic glasses (Cu 60 Zr 20 Ti 20 and Cu 55 Zr 16 Ti 29 , at. %) was experimentally studied by means of differential scanning calorimetry and in situ hard X-ray diffraction. Results of our experiments prove different atomic structure and behaviour of the glasses upon the annealing. Special emphasis is placed on the thermally activated effects which precede the crystallization. During the annealing, both glasses initially show with elevated temperature continuous short and middle range order thermal expansion and an overall decline of the atomic structure ordering. But above a temperature, which can be slightly different for every mean atomic neighbour (or every atomic coordination shell), one can observe a change in behaviour of the glasses: the glasses modify the thermal expansion rate of most of the mean atomic neighbours' distances and show a tendency to increase the degree of ordering of the atomic structure. Both these effects are more pronounced for Cu 55

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“…In addition, in the CuÀHf case, the optimized glass-forming composition is not severely off-eutectic, which is unlike the CuÀZr binary. 22,23,33 It can be attributed to the feature of nearly symmetric liquidus close to the eutectic of (L ! Cu 10 Hf 7 + CuHf 2 ), as seen in the phase diagram.…”

Section: Resultsmentioning

confidence: 99%

“…32,33,58 In the CuÀHf binary system, there is an additional BMG-forming composition related to the (L ! Cu 8 Hf 3 + Cu 10 Hf 7 ) eutectic.…”

Section: Discussionmentioning

confidence: 99%

“…It implies that its critical cooling rate for glass formation (less than 10 K/s) is at least an order of magnitude lower than that of CuÀHf binary glass former. Meanwhile, the GFA of Cu 49 Hf 42 Al 9 seems to be one of the strongest among the already-discovered ternary Cu/Zr-based alloys including CuÀZrÀAl, 10 ZrÀNiÀAl, 11 CuÀZrÀTi, [31][32][33] CuÀHfÀTi, 31 and CuÀZrÀAg. 34 Consequently, to understand the origin of the GFA improvement from the base binary CuÀHf to the ternary CuÀHfÀAl, it is useful to conduct a systematic comparison of the relevant eutectic reactions, solidification pathways of the melt, and fragility/strength of the liquid.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of bulk metallic glass formation between Cu-Hf binary and Cu-Hf-Al ternary alloys

Jia

2009

J. Mater. Res.

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Optimized compositions for bulk metallic glass (BMG) formation have been determined for the CuÀHf binary and CuÀHfÀAl ternary systems. The CuÀHfÀAl BMG-forming composition region is identified to correlate with the (L ! Cu 10 Hf 7 + CuHf 2 + CuHfAl) eutectic reaction. The eutectic temperature is reduced by nearly 50 K relative to that of the binary eutectic, demonstrating the significant role of the third element Al in stabilizing the liquid. The fragility parameter D* of the Cu 55 Hf 45 binary and Cu 49 Hf 42 Al 9 ternary supercooled liquid was determined from relaxation time measurements, indicating that Al incorporation also leads to a "stronger" liquid. The combination of these thermodynamic and kinetic effects is responsible for the dramatic enhancement of glass-forming ability from the CuÀHf binary to the CuÀHfÀAl ternary.

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A new composition zone of bulk metallic glass formation in the Cu–Zr–Ti ternary system and its correlation with the eutectic reaction

Cited by 29 publications

References 31 publications

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

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

Atomic structure of Cu–Zr–Ti metallic glasses subjected to high temperature annealing

Comparison of bulk metallic glass formation between Cu-Hf binary and Cu-Hf-Al ternary alloys

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