“Work-Hardenable” Ductile Bulk Metallic Glass

Das, J.; Tang, Mingdong; Kim, Ki Buem; Theissmann, Ralf; Baier, F.; Wang, Wei Hua; Eckert, J.

doi:10.1103/physrevlett.94.205501

Cited by 887 publications

(515 citation statements)

References 23 publications

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“…Although one or two kind of fully amorphous bulk metallic alloys have been recently found to exhibit enhanced ductility [21,22], methods for improving the plasticity of bulk amorphous alloys still focus around the addition of a second phase having a different strength and Young's modulus into the glass matrix. This will modify the stress field near the second phase within the amorphous matrix during loading.…”

Section: Discussionmentioning

confidence: 99%

Formation, thermal stability and deformation behavior of graphite-flakes reinforced Cu-based bulk metallic glass matrix composites

Yangshan

Shek

Guan

et al. 2006

Materials Science and Engineering: A

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Graphite-flake reinforced Cu 47 Ti 34 Zr 11 Ni 8 bulk metallic glass matrix composite was fabricated by water-cooled copper mould cast. Most of the graphite flakes still keep unreacted and distribute uniformly in the amorphous matrix except that some reactive wetting occurs by the formation of TiC particles around the flakes. It reveals that the presence of graphite flakes does not affect the onset of the glass transition temperature, crystallization reaction and liquidus of the metallic glass. The resulting material shows obvious serrated flow and higher fracture strength under room temperature compressive load, comparing with the monolithic bulk metallic glass (BMG). Three types of interaction between the shear bands and graphite flakes, namely, shear band termination, shear bands branching and new shear bands formation near the graphite flakes can be observed by quasi-static uniaxial compression test and bonded interface technique through Vickers indentation.

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Section: Discussionmentioning

confidence: 99%

Formation, thermal stability and deformation behavior of graphite-flakes reinforced Cu-based bulk metallic glass matrix composites

Yangshan

Shek

Guan

et al. 2006

Materials Science and Engineering: A

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“…From previous investigations, it has been determined that atomic/nanoscale chemical fluctuation occurs in (TiCu)- [22] and (ZrCu)- [12] based BMGs developed from equiatomic binary Ti 50 Cu 50 and Zr 50 Cu 50 alloys. Especially, the (TiCu)-based BMGs devitrify into the metastable NiTi-type B2 compound followed by the stable c-TiCu phase.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, some BMGs with relatively large plastic strain were developed, and the potential mechanisms for the enhanced macroscopic plasticity of the BMGs were proposed based upon theoretical and experimental results. [10][11][12][13][14][15] From the theoretical approach, [12,[16][17][18] the flow of metallic glassforming liquids and the flow and fracture of metallic glasses and their relation to elastic constants, i.e.,…”

Section: Introductionmentioning

confidence: 99%

Combinatorial Influence of Bimodal Size of B2 TiCu Compounds on Plasticity of Ti-Cu-Ni-Zr-Sn-Si Bulk Metallic Glass Composites

Hong

Kim

Lee

et al. 2013

Metall Mater Trans A

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We report on the formation of Ti-Cu-Ni-Zr-Sn-Si bulk metallic glass composites containing bimodal size of B2 TiCu compounds. The small B2 TiCu compound with a size of 1 to 10 lm has a strong influence on the oscillation of the shear stress, thus causing wavy propagation of the shear bands. In contrast, the large B2 TiCu compound with a size of 70 to 150 lm dissipates the shear stress by branching and multiplication of the shear bands. By forming the bimodal size of B2 TiCu compound, it is possible to determine the harmonic influence to further enhance the plasticity of the Ti-Cu-Ni-Zr-Sn-Si bulk metallic glass composites.

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“…Nevertheless, the localized deformation within the shear bands was still primarily responsible for the observed plasticity in both Cu 50 Zr 50 and ͑Cu 50 Zr 50 ͒ 95 Al 5 BMGs. 12 Therefore, the precise mechanisms responsible for the plastic deformation of the Cu 50 Zr 50 and ͑Cu 50 Zr 50 ͒ 95 Al 5 BMGs require further investigations. 13,14 Recently, it was reported that the ductility of BMGs was closely related to their Poisson's ratio.…”

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confidence: 99%

Thermophysical and elastic properties of Cu50Zr50 and (Cu50Zr50)95Al5 bulk-metallic-glass-forming alloys

Fan

Freels

Choo

et al. 2006

Applied Physics Letters

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By employing a containerless high-temperature high-vacuum electrostatic levitation technique, the thermophysical properties, including the ratio between the specific heat capacity and the hemispherical total emissivity, the specific volume, and the viscosity, of Cu 50 Zr 50 and ͑Cu 50 Zr 50 ͒ 95 Al 5 bulk-metallic-glass ͑BMG͒-forming liquids have been measured. Compared with Cu 50 Zr 50 , the improved glass-forming ability of ͑Cu 50 Zr 50 ͒ 95 Al 5 can be attributed to its dense liquid structure and its high value of viscosity. Additionally, the relationship between the viscosity of various BMG forming liquids at the melting temperature and the elastic properties of the corresponding glasses at room temperature will be compared. © 2006 American Institute of Physics. ͓DOI: 10.1063/1.2408634͔The processing, the thermophysical, and mechanical properties of low-cost Cu-based bulk-metallic glasses ͑BMGs͒ have been intensively studied recently. [1][2][3][4][5] The Cubased BMGs exhibit extraordinarily high strength and good compressive ductility, which are comparable with the Zrbased BMGs. In order to frustrate the crystal formation during the copper-mold casting process, previous studies indicate that BMG alloys should typically consist of at least three components, which have varying atomic sizes. 6 However, it was reported recently that binary Cu-Zr alloys can be cast into bulk amorphous structures with sample diameters up to 2 mm. 7-10 Subsequent studies reveal that small amounts of Al additions ͑several at. %͒ further increase its glass-forming ability ͑GFA͒ in the ternary Cu-Zr-Al alloys. 11 Das et al. 12 reported that both Cu 50 Zr 50 and ͑Cu 50 Zr 50 ͒ 95 Al 5 BMGs exhibit good compressive ductility at room temperature. Most strikingly, the Cu 50 Zr 50 and ͑Cu 50 Zr 50 ͒ 95 Al 5 BMGs exhibit "strain hardening" effects during the compressive tests, which were not expected for the BMG alloys since there is no dislocation activities in the amorphous structure. Strain hardening is a desirable factor for the prevention of the strain localization. Nevertheless, the localized deformation within the shear bands was still primarily responsible for the observed plasticity in both Cu 50 Zr 50 and ͑Cu 50 Zr 50 ͒ 95 Al 5 BMGs. 12 Therefore, the precise mechanisms responsible for the plastic deformation of the Cu 50 Zr 50 and ͑Cu 50 Zr 50 ͒ 95 Al 5 BMGs require further investigations. 13,14 Recently, it was reported that the ductility of BMGs was closely related to their Poisson's ratio. [15][16][17] For example, Ptbased BMG with high Poisson's ratio of about 0.41 shows an excellent compressive ductility. 15 Nivikov and Sokolov 18 reported that Poisson's ratio of a glass at room temperature correlates with the fragility of liquids at high temperature. This correlation was recently challenged by Yannopoulos and Johari 19 by compiling extensive experimental data covering various glass-forming systems. In this letter, in an effort to further understand the relationship between the fragility and the elastic properties of glass-...

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“Work-Hardenable” Ductile Bulk Metallic Glass

Cited by 887 publications

References 23 publications

Formation, thermal stability and deformation behavior of graphite-flakes reinforced Cu-based bulk metallic glass matrix composites

Formation, thermal stability and deformation behavior of graphite-flakes reinforced Cu-based bulk metallic glass matrix composites

Combinatorial Influence of Bimodal Size of B2 TiCu Compounds on Plasticity of Ti-Cu-Ni-Zr-Sn-Si Bulk Metallic Glass Composites

Thermophysical and elastic properties of Cu50Zr50 and (Cu50Zr50)95Al5 bulk-metallic-glass-forming alloys

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