Atomistic mechanism for nanocrystallization of metallic glasses

Liu, X.J.; Chen, G.L.; Hou, Huaiyu; Xian, Hui; Yao, K.; Lu, Zp P.; Liu, C.T.

doi:10.1016/j.actamat.2008.02.019

Cited by 79 publications

(43 citation statements)

References 42 publications

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“…4. While the common notion from the classic theory adopts a ''two-well'' concept [11,24], in which a disordered structure can be envisaged as jumping across an energy barrier directly into the corresponding crystalline phase, however, our results suggest that it is necessary to add a short-range ordered metastable state in between (Fig. 4).…”

Section: Prl 106 215505 (2011) P H Y S I C a L R E V I E W L E T T Econtrasting

confidence: 43%

“…3(c). Although short-range ordered atomic clusters have been proposed as the crystallization sites for metallic glasses in the literature [8,11], however, here our experimental results clearly indicate that the atomic clusters act mainly as obstacles to the formation of the global 1D periodicity. The presence of the atomic clusters raises lattice mismatch in the ordered atomic structures, causing delayed crystal nucleation and resulting in a pinning effect, Fig.…”

supporting

confidence: 45%

“…Since the advent of multicomponent bulk metallic glasses (BMGs) in the early 1990s, the stability of their glass-forming liquids with respect to crystallization have been extensively investigated owing to its scientific and technological importance [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. Despite substantial dedicated effort, one question yet to be resolved is why some BMGs exhibit a high crystallization resistance while others do not [12,15].…”

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confidence: 99%

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Atomic-Scale Structural Evolution and Stability of Supercooled Liquid of a Zr-Based Bulk Metallic Glass

et al. 2011

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In this Letter, direct experimental evidence is provided for understanding the thermal stability with respect to crystallization in the Zr 41:2 Ti 13:8 Cu 12:5 Ni 10 Be 22:5 glass-forming liquid. Through high-resolution transmission electron microscopy, the atomic-structure evolution in the glass-forming liquid during the isothermal annealing process is clearly revealed. In contrast with the existing theoretical models, our results reveal that, prior to nanocrystallization, there exists a metastable state prone to forming icosahedralike atomic clusters, which impede the subsequent crystallization and hence stabilize the supercooled liquid. The outcome of the current research underpins the topological origin for the excellent thermal stability displayed by the Zr-based bulk metallic glass.

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Section: Prl 106 215505 (2011) P H Y S I C a L R E V I E W L E T T Econtrasting

confidence: 43%

supporting

confidence: 45%

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confidence: 99%

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Atomic-Scale Structural Evolution and Stability of Supercooled Liquid of a Zr-Based Bulk Metallic Glass

et al. 2011

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“…As an example, the fcc-Zr 2 Ni SRO and MRO which were often observed in Zr-based MGs and their undercooled liquids can directly transform into the crystalline counterpart, the fcc-Zr 2 Ni crystal, when the MGs were annealed. 24,25 Despite the correlation between the primary phases and the atomic clusters in MGs has been perceived, a direct experimental evidence that bridges the link between the primary phases and the ISRO and CSRO in MGs is still missing. Furthermore, the competitive growth between ISRO and CSRO during crystallization has not been studied.…”

Section: Introductionmentioning

confidence: 99%

Correlation between primary phases and atomic clusters in a Zr-based metallic glass

Liu

Chen

Liu

2010

Journal of Applied Physics

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Electrical and spectroscopic analysis in nanostructured SnO2: "Long-term" resistance drift is due to in-diffusion J. Appl. Phys. 110, 093711 (2011) Study on the structural and physical properties of ZnO nanowire arrays grown via electrochemical and hydrothermal depositions J. Appl. Phys. 110, 094310 (2011) Silver/silicon dioxide/silver sandwich films in the blue-to-red spectral regime with negative-real refractive index Appl. Phys. Lett. 99, 181117 (2011) Fluorescence enhancement of light-harvesting complex 2 from purple bacteria coupled to spherical gold nanoparticles Appl. Phys. Lett. 99, 173701 (2011) Optical study of the effect of the impurity content on the ferroelectric properties of Er3+ doped SBN glassceramic samples J. Appl. Phys. 110, 084113 (2011) Additional information on J. Appl. Phys. Atomic clusters exiting in the Zr 65 Ti 10 Ni 25 metallic glass and primary phases generated during crystallization were studied by x-ray scattering and high-resolution transmission microscopy. An intrinsic correlation between the atomic clusters and the primary phases has been revealed. It is found that there are topological icosahedral short-range orders ͑ISROs͒ in the as-cast sample in addition to fcc-Zr 2 Ni-type chemical SROs. These topological ISRO and fcc-Zr 2 Ni-type chemical SRO can simultaneously quasicrystallize/crystallize into the corresponding nanoscaled icosahedral quasicrystalline phase ͑I-phase͒ and fcc-Zr 2 Ni crystal as primary products during crystallization. The synchronic precipitation of these two metastable phases can be understood in terms of their structural similarity between the fcc-Zr 2 Ni and I-phase in local atomic configuration. In comparison with fcc-Zr 2 Ni crystal, the I-phase has a smaller size and lower volume fraction due to its lower growth rate attributed to its more complex composition and higher structural symmetry. The competitive growth between these two phases results in the development of nanostructured materials in this alloy after annealing.

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“…This means that the atoms tend to form the densely-packed linear and planar order regions in the medium range, as the medium-range order in the system. That is, unlike the SRO, the MRO in glasses is of one or two dimensions, suggesting the imperfect ordered packing feature [45,46].…”

Section: Medium-rang Order and Atomic Packing Characteristicsmentioning

confidence: 99%

Short-to-Medium-Range Order and Atomic Packing in Zr48Cu36Ag8Al8 Bulk Metallic Glass

et al. 2016

Metals

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Due to its excellent glass-forming ability (GFA), the Zr 48 Cu 36 Al 8 Ag 8 bulk metallic glass (BMG) is of great importance in glass transition investigations and new materials development. However, due to the lack of detailed structural information, the local structure and atomic packing of this alloy is still unknown. In this work, synchrotron measurement and reverse Monte Carlo simulation are performed on the atomic configuration of a Zr-based bulk metallic glass. The local structure is characterized in terms of bond pairs and Voronoi tessellation. It is found that there are mainly two types of bond pairs in the configuration, as the body-centered cubic (bcc)-type and icosahedral (ico)-type bond pairs. On the other hand, the main polyhedra in the configuration are icosahedra and the bcc structure. That is, the bcc-type bond pairs, together with the ico-type bond pairs, form the bcc polyhedra, introducing the distortion in bcc clusters in short range. However, in the medium range, the atoms formed linear or planar structures, other than the tridimensional clusters. That is, the medium-range order in glass is of 1D or 2D structure, suggesting the imperfect ordered packing feature.

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Atomistic mechanism for nanocrystallization of metallic glasses

Cited by 79 publications

References 42 publications

Atomic-Scale Structural Evolution and Stability of Supercooled Liquid of a Zr-Based Bulk Metallic Glass

Atomic-Scale Structural Evolution and Stability of Supercooled Liquid of a Zr-Based Bulk Metallic Glass

Correlation between primary phases and atomic clusters in a Zr-based metallic glass

Short-to-Medium-Range Order and Atomic Packing in Zr48Cu36Ag8Al8 Bulk Metallic Glass

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