A new criterion for evaluating the glass-forming ability of bulk glass forming alloys

Yuan, Zi-Zhou; Bao, Shi-Lei; Lu, Ye; Zhang, Dapeng; Lin, Yueqiang

doi:10.1016/j.jallcom.2007.05.037

Cited by 156 publications

(66 citation statements)

References 48 publications

(52 reference statements)

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“…The similarity in plots in Figure 3 Further analysis was performed in detail by focusing on the relationships among H-E alloys, BMGs and H-E BMGs on the basis of H mix - and H mix - 2 diagrams shown in Figure 5. Figure 5a is a revised H mix - diagram to the one reported in the authors' previous work [24] to which the sub x-axis according to Equation (11) and the data of 264 BMGs with the critical diameter (d c ) ranging 0.2-12 mm [25] and 25 BMGs with d c  half inch (~ 12.3 mm) [26] are added for comparison. Figure 5a indicates that almost all the BMGs and HE-BMGs are plotted under S  /k B < 0.7 ~ ln 2.…”

Section: Resultsmentioning

confidence: 99%

Entropies in Alloy Design for High-Entropy and Bulk Glassy Alloys

Takeuchi

Amiya

Wada

et al. 2013

Entropy

110

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High-entropy (H-E) alloys, bulk metallic glasses (BMGs) and high-entropy BMGs (HE-BMGs) were statistically analyzed with the help of a database of ternary amorphous alloys. Thermodynamic quantities corresponding to heat of mixing and atomic size differences were calculated as a function of composition of the multicomponent alloys. Actual calculations were performed for configurational entropy (S config. ) in defining the H-E alloys and mismatch entropy (S  ) normalized with Boltzmann constant (k B ), together with mixing enthalpy (H mix ) based on Miedema's empirical model and Delta parameter () as a corresponding parameter to S  /k B . The comparison between H mix - and H mix -σ B S k diagrams for the ternary amorphous alloys revealed S  /k B ~ ( /22) 2 . The zones S, S′ and B's where H-E alloys with disordered solid solutions, ordered alloys and BMGs are plotted in the H mix - diagram are correlated with the areas in the H mix -S  /k B diagram. The results provide mutual understandings among H-E alloys, BMGs and HE-BMGs.

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Section: Resultsmentioning

confidence: 99%

Entropies in Alloy Design for High-Entropy and Bulk Glassy Alloys

Takeuchi

Amiya

Wada

et al. 2013

Entropy

110

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“…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%

“…In addition, the GFA of the studied Cu-based alloys were evaluated by the GFA indicators, such as [36][37][38][39]. 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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“…1 So far, various rules, principles, and criteria have been presented to guide the development of amorphous alloys having high glass-forming ability (GFA) [2][3][4][5][6][7] because high GFA is required for a broad application of MGs as engineering materials. MGs with high GFA usually can be fabricated in multicomponent alloy systems containing at least three elements.…”

Section: Introductionmentioning

confidence: 99%

Structural origin of the pinpoint-composition effect on the glass-forming ability in the NiNb alloy system

2013

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Great research efforts to investigate the glass-forming ability (GFA) in alloys have been made, leading to an observation that a pinpoint composition produces the best glass-forming characteristics. The reason for this observation is still unknown, limiting the development of bulk metallic glasses (MGs) with a relatively large size. In this work, systematic experimental measurements coupled with calculations were performed to address this issue using the NiNb binary alloy system. It is found that the atomic-level packing efficiency and the clusters-level regularity parameters strongly contribute to their GFA. In particular, the best glass former found in a pinpoint composition possesses the local maximum of the atomic-packing efficiency and the highest degree of the cluster regularity. This work provides an understanding of GFA from atomic and cluster levels and will shed light on the development of more MGs with relatively large critical casting sizes.

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A new criterion for evaluating the glass-forming ability of bulk glass forming alloys

Cited by 156 publications

References 48 publications

Entropies in Alloy Design for High-Entropy and Bulk Glassy Alloys

Entropies in Alloy Design for High-Entropy and Bulk Glassy Alloys

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

Structural origin of the pinpoint-composition effect on the glass-forming ability in the NiNb alloy system

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