CaAl-based bulk metallic glasses with high thermal stability

Guo, F.Q.; Poon, S. J.; Shiflet, G. J.

doi:10.1063/1.1637940

Cited by 113 publications

(68 citation statements)

References 11 publications

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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: 93%

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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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Section: Introductionmentioning

confidence: 93%

“…r small /r large Cu-Zr [10][11][12] 0.7039 Cu-Hf [7][8][9] 0.6971 Ni-Nb [13] 0.7525 Ca-Al [14] 0.6082 that q ranges from 0.55 to 0.80. Here, we use a binary colloid system to simulate the situation of binary BMGs with large particle (d = 2.9 m) and smaller particles (d = 2.0 m).…”

Section: Alloy Systemmentioning

confidence: 99%

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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“…The maximum amorphous thicknesses achieved for the CaMg-Al alloys, both in plates and rods, were in the range of~1 to 2 mm, [15,30] and the bulk glassy alloys were produced in a much narrower composition range (identified by an oval area in Figure 3(c)). This composition range corresponds to the CaMg 2 phase field and is close to the eutectic composition.…”

Section: A Ternary Systemsmentioning

confidence: 99%

“…Indeed, depending on the alloy composition, T g varies from 130°C to 240°C, T x from 152°C to 282°C, and DT x from 20°C to 57°C. [15,30] The best glass formers in this system, which show a critical plate thickness s max~2 mm, are Ca 70 Mg 15 Al 15 (T g = 147°C, DT x = 40°C, and T rg = 0.54) and Ca 65 Mg 15 Al 20 (T g = 190°C, DT x = 28°C, and T rg = 0.60) ( Table I). The Ca-Mg-Al glasses do not contain heavy transition metals, and, therefore, they have the lowest densities among all Ca-based metallic glasses, as well as all other glasses.…”

Section: A Ternary Systemsmentioning

confidence: 99%

Development and Characterization of Low-Density Ca-Based Bulk Metallic Glasses: An Overview

Senkov

Miracle

Keppens

et al. 2007

Metall Mater Trans A

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Ca-based bulk metallic glasses (BMGs) have unique properties and represent a new seventh group of BMGs. Many of them have excellent GFA, which can be related to their efficient atomic packing, low onset driving force for crystallization, and high viscosity (high relaxation time) of the supercooled liquid. The Ca-based glasses have the lowest density and elastic moduli among all BMGs discovered to date. Unfortunately, as many other glasses, Ca-based BMGs are brittle below the glass transition temperature, and they also have marginal oxidation and corrosion resistance. The latter can be improved by proper selection of alloying elements. In this article, we review recent work on the development of low-density Ca-based BMGs and discuss the effect of alloy composition on the thermal, physical, and chemical properties of these glasses.

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“…These rules do not strictly apply in many cases since new bulk metallic glasses have been discovered in some binary systems, [12][13][14][15][16] in compositions far from the eutectic points 14,[17][18][19][20] and in alloys where the addition of elements with a positive heat of mixing can induce phase separation and hence improve the GFA. 21 The lack of accuracy of these empirical rules shows the necessity for new tools with a reliable predictability in order to facilitate the search of new glass-forming compositions.…”

Section: Introductionmentioning

confidence: 99%

Prediction of good glass formers in the Al-Ni-La and Al-Ni-Gd systems using topological instability and electronegativity

Gargarella

Oliveira

Kiminami

et al. 2011

Journal of Applied Physics

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Surface rippling on bulk metallic glass under nanosecond pulse laser ablation Appl. Phys. Lett. 99, 191902 (2011) Construction of a disorder variable from Steinhardt order parameters in binary mixtures at high densities in three dimensions J. Chem. Phys. 135, 174109 (2011) Fragility of iron-based glasses Appl. Phys. Lett. 99, 161902 (2011) Communication: Are metallic glasses different from other glasses? A closer look at their high frequency dynamics J. Chem. Phys. 135, 101101 (2011) Temperature dependence of the thermoplastic formability in bulk metallic glasses J. Appl. Phys. 110, 043518 (2011) Additional information on J. Appl. Phys. A new criterion has been recently proposed combining the topological instability (k criterion) and the average electronegativity difference (De) among the elements of an alloy to predict and select new glass-forming compositions. In the present work, this criterion (k.De) is applied to the Al-Ni-La and Al-Ni-Gd ternary systems and its predictability is validated using literature data for both systems and additionally, using own experimental data for the Al-La-Ni system. The compositions with a high k.De value found in each ternary system exhibit a very good correlation with the glassforming ability of different alloys as indicated by their supercooled liquid regions (DT x ) and their critical casting thicknesses. In the case of the Al-La-Ni system, the alloy with the largest k.De value, La 56 Al 26.5 Ni 17.5 , exhibits the highest glass-forming ability verified for this system. Therefore, the combined k.De criterion is a simple and efficient tool to select new glass-forming compositions in Al-Ni-RE systems.

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CaAl-based bulk metallic glasses with high thermal stability

Cited by 113 publications

References 11 publications

Study on crystallization kinetics of binary alloys through model colloidal mixtures

Study on crystallization kinetics of binary alloys through model colloidal mixtures

Development and Characterization of Low-Density Ca-Based Bulk Metallic Glasses: An Overview

Prediction of good glass formers in the Al-Ni-La and Al-Ni-Gd systems using topological instability and electronegativity

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