Bulk metallic glass formation in the binary Cu–Zr system

Wang, D.; Li, Y.; Sun, Bin; Sui, Manling; Lu, K.; Ma, Evan

doi:10.1063/1.1751219

Cited by 480 publications

(274 citation statements)

References 18 publications

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“…Bulk metallic glasses (BMGs) have a unique range of properties that make them of considerable scientific and technological interest [1][2][3][4][5]. Their atomic structures are amorphous, without crystalline order, which means that no dislocation defects exist, and so BMGs can have strengths "far exceeding any conventional metallic material" [6].…”

Section: Introductionmentioning

confidence: 99%

Atomic structure of biodegradable Mg-based bulk metallic glass

Christie

2015

Phys. Chem. Chem. Phys.

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We have used highly accurate first-principles molecular dynamics simulations to elucidate the structure of Mg 60 Zn 35 Ca 5 and Mg 72 Zn 23 Ca 5 bulk metallic glasses, which are candidate materials for biomedical implants; these two compositions exhibit different behaviours when implanted. The environments of each species are different, and average coordination numbers are ∼ 13 for Mg, ∼ 11 for Zn and ∼ 18 − 19 for Ca. A wide range of local environments were found and icosahedral motifs, often seen in bulk metallic glasses, were among the most common for both Mg and Zn.Through the computation of a chemical short-range order parameter, a moderate avoidance of ZnZn bonding over Zn-Mg or Zn-Ca was observed. No statistically significant difference in structure was observed between the two compositions.

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Section: Introductionmentioning

confidence: 99%

Atomic structure of biodegradable Mg-based bulk metallic glass

Christie

2015

Phys. Chem. Chem. Phys.

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“…5b and Table 1 show the decrease of the T m and T L by Al addition, the lowest T m of Cu 50 Zr 46 Al 4 alloy and the lowest T L of Cu 50 Zr 45 Al 5 alloy. Nevertheless, previous researches [42][43][44] have clarified that the best GFA composition for the alloy is close to deep eutectic point. It is obviously from Fig.…”

Section: Articlesmentioning

confidence: 99%

“…1. It is well-known that the decrease of the T m or T L is advantageous of the stability of the alloy liquid, resulting in the increase of the GFA [36][37][38][39][42][43][44]. Fig.…”

Section: Articlesmentioning

confidence: 99%

Phase formation, glass forming ability, mechanical and thermal properties of Cu50Zr50−x Al x (0⩽x⩽11.0) glass forming alloys

Cai

Liu

et al. 2015

Sci. China Mater.

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Phase formation, glass forming ability, mechanical and thermal properties of Cu50Zr50−xAlx (0x 11.0) glass forming alloys were systematically investigated. The results show that Cu50Zr47Al3 alloy has the best glass forming ability (GFA), lowest fragility index (m) and highest fracture strength. There are B2 CuZr and B19' CuZr phases for Cu50Zr50−xAlx (0x5.0) alloys. B2 CuZr phase disappears and two new phases (Cu10Zr7 and CuZr2) appear when 5.05.0). Cu50Zr50−xAlx (0x4.0) alloys are off-eutectic compositions while near-eutectic compositions for Cu50Zr50−xAlx (5.0x11.0) alloys. The Eg, Ex, and Ep decrease with increasing sensitive factor (β) for the studied Cu-based alloys characterized in the room-temperature brittleness. The dependence of the phase formation and GFA on the Al content is discussed. INTRODUCTIONCu-based bulk metallic glasses (BMGs) have been extensively investigated due to their interestingly properties including work hardening [1], martensitic transformation [2-5], magnetism [6], catalytic activity [7,8], cryogenic temperature plasticity [9] and room-temperature plasticity [10][11][12][13][14], which enable their applications as structural and functional materials.Cu-Zr binary alloy system is characterized by good glass forming ability (GFA) and wide composition region for the formation of glass alloys [15] Element minor addition/substitution is a well-known method for improving the GFA and other properties of glass forming alloys [6,[12][13][14]19,20]. For example, Mattern et al. [6] found that a ferromagnetic Gd-enriched nanocluster could form in Cu 50 Zr 50−x Gd x (x=5) metallic glasses due to the phase separation by Gd minor addition. Xi et al. [20] found that Gd minor addition improved the combination of the GFA and the room-temperature plasticity of Cu 46 Zr 47 Al 7 BMG. Ma et al. [12] investigated the effect of substituting Al by Ti on the GFA and the mechanical properties of brittle Cu 46 Zr 46 Al 8 BMG and found that the Ti addition significantly increased the plasticity although the characteristic temperatures including the glass transition temperature (T g ), onset crystallisation temperature (T x ) and supercooled liquid region (ΔT x ) decreased with increasing Ti content. Kuo et al. [13] investigated the effect of V on the phase formation and plasticity in Cu 47.5 Zr 47.5 Al 5 glassy alloy and found that V minor addition improved the plasticity by doubling the fracture strain to 9.4% in (Cu 47.5 Zr 47.5 Al 5 ) 99 V 1 due to the formation of B2-CuZr precipitates. Recently, Cai et al. [14] found that the substitution of Ti by Ni significantly influences the GFA, mechanical, electrical and thermal properties of Cu 50 Zr 40 Ti 10...

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“…This compositional complexity makes it extremely difficult for different atoms to rearrange their spatial positions so that they are frozen directly into a disordered glassy structure upon cooling. Recently, binary BMG forming alloys have also been developed in a few alloy families [6][7][8][9][10][11][12][13][14], and their GFA is found to be very sensitive to the minor change of chemical composition [15,16]. These further confuse the criterions of GFA in metallic alloys.…”

Section: Introductionmentioning

confidence: 94%

Study on crystallization kinetics of binary alloys through model colloidal mixtures

Ding

Dai

et al. 2010

Journal of Alloys and Compounds

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a b s t r a c tSince the discovery of amorphous alloys, extensive attentions have been paid to understand the mechanism of glass-forming. The structural studies on its underlying mechanism have met challenge on direct structural characterization. It has been shown that the phase behavior of colloids dispersed in a solvent is thermodynamically equivalent to that of atoms and small molecules, however, colloids can be studied with optical microscopy due to their relatively large size. In this work, we use a binary colloidal model system with the particle size ratio comparable to atomic ratio of reported binary bulk metallic glasses to study the topological effect on crystallization and glass-forming ability of binary metallic alloys (Cu-Hf and Cu-Zr systems). The crystallization kinetics and structure of the colloid system were studied by realtime optical examination and light scattering technique. The results exhibit that there are two confined regions in the mixing ratio (composition) range in the colloid system with an enhanced glass-forming ability and retarded crystallization kinetics. The agreement between results of the model system and the experimental data on the binary bulk metallic glass formation suggests that purely topological factor plays an important role in determining the glass-forming ability.

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Bulk metallic glass formation in the binary Cu–Zr system

Cited by 480 publications

References 18 publications

Atomic structure of biodegradable Mg-based bulk metallic glass

Atomic structure of biodegradable Mg-based bulk metallic glass

Phase formation, glass forming ability, mechanical and thermal properties of Cu50Zr50−x Al x (0⩽x⩽11.0) glass forming alloys

Study on crystallization kinetics of binary alloys through model colloidal mixtures

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