Structural changes induced by microalloying in Cu46Zr47−Al7Gd  metallic glasses

Xi, X.K.; Sandor, Magdalena; Liu, Yan Hui; Wang, Wei Hua; Wu, Yue

doi:10.1016/j.scriptamat.2009.08.002

Cited by 23 publications

(15 citation statements)

References 21 publications

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“…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.…”

Section: Introductionmentioning

confidence: 99%

“…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.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

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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“…For example, the regularity of a Cu 6 Zr 5 Y 1 Al 1 <0,2,8,2> VC is obviously different from that of another Cu 6 Zr 5 Y 1 Al 1 <0,2,8,2> counterpart, as shown in Figure 5. In previous work, it was suggested that the regularity of clusters may influence the glass formation in alloys [25,43,44]. Thus, we should know whether or not the regularity of VCs contributes to the GFA of Cu 46 Furthermore, the VC's shape strongly depends on the "stoichiometry" of its containing atoms, due to the atomic radial diversity among heterogeneous atoms [42].…”

Section: Resultsmentioning

confidence: 99%

Structural Origin of the Enhanced Glass-Forming Ability Induced by Microalloying Y in the ZrCuAl Alloy

Guo

Yang

2016

Metals

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Abstract:In this work, the structural origin of the enhanced glass-forming ability induced by microalloying Y in a ZrCuAl multicomponent system is studied by performing synchrotron radiation experiments combined with simulations. It is revealed that the addition of Y leads to the optimization of local structures, including: (1) more Zr-centered and Y-centered icosahedral-like clusters occur in the microstructure; (2) the atomic packing efficiency inside clusters and the regularity of clusters are both enhanced. These structural optimizations help to stabilize the amorphous structure in the ZrCuAlY system, and lead to a high glass-forming ability (GFA). The present work provides an understanding of GFAs in multicomponent alloys and will shed light on the development of more metallic glasses with high GFAs.

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“…In previous work, it was proposed that the local structures closest to the spherical symmetry leads to the best GFA, 46,47 which suggested that the regularity of clusters also may be a structural feature contributing to the GFA. It is acknowledged that the more regular a polyhedron is, the more compact it should be, such as the regular tetrahedron, the cube, and the sphere.…”

Section: Experimental and Simulation Methodsmentioning

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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Structural changes induced by microalloying in Cu46Zr47−Al7Gd metallic glasses

Cited by 23 publications

References 21 publications

Phase formation, glass forming ability, mechanical and thermal properties of Cu50Zr50−x Al x (0⩽x⩽11.0) glass forming 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 Enhanced Glass-Forming Ability Induced by Microalloying Y in the ZrCuAl Alloy

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

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