Diffusion mechanisms in metallic supercooled liquids and glasses

Tang, Xiaoping; Geyer, U.; Busch, Ralf; Johnson, William L.; Wu, Yue

doi:10.1038/45996

Cited by 322 publications

(160 citation statements)

References 21 publications

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“…For comparison, we also study the Zr 46.8 Ti 8.2 Cu 7.5 Ni 10 Be 27.5 bulk metallic glass, one of the most widely studied bulk metallic glasses. 6 We found that the glass transition temperature increases with pressure by 4.4 K/GPa, in good agreement with the data reported in Ref. 4, and the supercooled liquid range decreases with pressure by 2.9 K/GPa in a pressure range of 0-2.2 GPa.…”

supporting

confidence: 81%

Pressure effect of glass transition temperature in Zr46.8Ti8.2Cu7.5Ni10Be27.5 bulk metallic glass

Jiang¹,

Roseker²,

Sikorski³

et al. 2004

Applied Physics Letters

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10 Be 27.5 bulk glass have been investigated by performing in situ high-temperature and high-pressure x-ray powder diffraction measurements using synchrotron radiation. The glass transition was detected from the change of the slope of peak position as a function of temperature. It is found that the glass transition temperature increases with pressure by 4.4 K/GPa for the Zr 46.8 Ti 8.2 Cu 7.5 Ni 10 Be 27.5 bulk glass, and the supercooled liquid range decreases with pressure by 2.9 K/GPa in a pressure range of 0-2.2 GPa. This method opens a possibility to study the pressure effect of glass transition process in glassy systems under high pressures ͑Ͼ1 GPa͒.

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confidence: 81%

Pressure effect of glass transition temperature in Zr46.8Ti8.2Cu7.5Ni10Be27.5 bulk metallic glass

Jiang¹,

Roseker²,

Sikorski³

et al. 2004

Applied Physics Letters

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“…[1][2][3][4][5][6][7][8][9][10][11] BMGs produced so far usually contain three or more elements. 1-3 Until now, complex compositions have been considered necessary in order to inhibit crystallization of the liquid phase during cooling of the melt.…”

mentioning

confidence: 99%

Design of Cu8Zr5-based bulk metallic glasses

Yang

Xia

Wang

et al. 2006

Applied Physics Letters

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Basic polyhedral clusters have been derived from intermetallic compounds at near-eutectic composition by considering a dense packing and random arrangement of atoms at shell sites. Using such building units, bulk metallic glasses can be formed. Since the discovery of glassy systems, based on multicomponent alloys, in the early 1990s, bulk metallic glasses ͑BMGs͒ have been extensively studied because certain mechanical properties, such as strength, can be significantly improved over their crystalline counterparts. 1-11 BMGs produced so far usually contain three or more elements. 1-3 Until now, complex compositions have been considered necessary in order to inhibit crystallization of the liquid phase during cooling of the melt. However, simpler systems should be of great interest, fundamentally as well as technologically, since they would facilitate the atomic-structure determination for a given BMG, which has been a long-standing problem. [12][13][14][15][16][17][18][19][20][21][22][23][24] Originally, the dense-random-packed model was used to describe metallic glasses. 25 This model is based on the assumption that the glass consists of a random arrangement of spherical atoms ͑hard spheres͒ of each element. However, it has also been pointed out that localized, directional chemical bonding and the formation of groups of atoms are relevant factors to theories of glass formation and stability. 26 The local structure is well defined and similar to that of the crystalline form of the material. Recently, a topological model for metallic glass formation was proposed. 27,28 According to that model, a solute occupying either substitutional or interstitial sites in the host lattice can destabilize the lattice by producing a critical internal strain. Besides the structural models mentioned above, several criteria for structural stability of a BMG have been suggested: ͑1͒ large value of the reduced glass transition temperature T g / T l , where T g is the glass transition temperature and T l is the liquidus temperaure; 29 ͑2͒ three empirical rules for a large supercooled liquid region: ͑a͒ multicomponent system, ͑b͒ significant differences in atomic size, and ͑c͒ negative heats of mixing among the main constituent atoms; 1,3 ͑3͒ high gamma value, ␥ = T x / ͑T g + T l ͒, where T x is crystallization temperature; 30 ͑4͒ interaction between the Fermi surface and the Brillouin zone in a nearly-free-electron model; 31 ͑5͒ the critical concentration of a solute element required for amorphization decreases, reaches a minimum, and then increases with increasing ratio between the size of the solute and the solvent atoms; 27,32,33 ͑6͒ there is an optimum ratio R * between the size of the solute atom and the average size of the surrounding solvent atoms for dense packing. 28,34 In spite of the criteria mentioned above, the design of alloys with a high glass forming ability ͑GFA͒ remains to a large extent unpredictable due to lack of understanding of the local atomic structure. Although polyhedral clusters have been revealed in some met...

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“…Promising technological applications seem to be within reach for this novel class of materials. Thus, the study of bulk metallic glasses has become a most active research field in the past decade [2][3][4][5][6][7][8][9][10][11]. Bulk metallic glasses produced so far usually contain three or more elements [1].…”

mentioning

confidence: 99%

Amorphouslike Diffraction Pattern in Solid Metallic Titanium

et al. 2005

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Amorphouslike diffraction patterns of solid elemental titanium have been detected under high pressure and high temperature using in situ energy-dispersive x-ray diffraction and a multianvil press. The onset pressure and the temperature of formation of amorphous titanium is found to be close to the --! triple point in the P-T phase diagram. Amorphous Ti has been found to be thermally stable up to 1250 C for at least 3 min at some pressures. By analyzing the conditions for producing amorphous elemental Zr and Ti, we observed a multi-phase-point amorphization phenomenon for preparing single-element bulk amorphous metals. The results reported may open a new way to preparing single-element bulk amorphous metals with a high thermal stability.

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Diffusion mechanisms in metallic supercooled liquids and glasses

Cited by 322 publications

References 21 publications

Pressure effect of glass transition temperature in Zr46.8Ti8.2Cu7.5Ni10Be27.5 bulk metallic glass

Pressure effect of glass transition temperature in Zr46.8Ti8.2Cu7.5Ni10Be27.5 bulk metallic glass

Design of Cu8Zr5-based bulk metallic glasses

Amorphouslike Diffraction Pattern in Solid Metallic Titanium

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