Superplastic Forging of ZrTiCuNiBe-Bulk Glass for Shaping of Microparts

Zumkley, Thomas; Suzuki, Shiori; Seidel, Martin W.; Mechler, S.; Macht, M.‐P.

doi:10.4028/www.scientific.net/msf.386-388.541

Cited by 14 publications

(5 citation statements)

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“…Moreover, the fracture strength of these two composites did not drop significantly at 603 K. It has been pointed out that the viscosity of metallic glasses will increase due to the presence of crystalline phases at high temperature. [48] The strength of metallic glasses will correspondingly increase due to the change in its microstructure. [48] It is therefore supposed that the addition of tungsten fibers may increase the viscosity of the composite and maintains its high strength even at high temperature.…”

Section: B Shear or Splitting Fracture And Bending Failure Mechanismmentioning

confidence: 99%

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Effects of tungsten fiber on failure mode of zr-based bulk metallic glassy composite

Zhang

Wang

et al. 2006

Metall Mater Trans A

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The authors systematically investigated the effects of tungsten fiber on failure mode as well as deformation and fracture mechanisms in tungsten fiber-reinforced Zr 41.25 Ti 13.75 Ni 10 Cu 12.5 Be 22.5 bulk metallic glassy composite under uniaxial compression at room and high temperatures. At room temperature, the failure mode of the composite changes from shear fracture to longitudinal splitting failure with increasing fiber volume fraction. Similar to the observations in monolithic metallic glasses, the shear fracture angle of the composite is approximately equal to 39;40 deg, indicating that the Mohr-Coulomb criterion is suitable to give the critical shear fracture condition of the composite. When the compression tests were performed below the glass transition temperature of Zr 41.25 Ti 13.75 Ni 10 Cu 12.5 Be 22.5 metallic glass T g , the deformation behavior of the composite strongly depends on the strain rates and the test temperature, which is quite similar to the deformation behavior of monolithic metallic glasses in the supercooled liquid region. The corresponding failure mode of the composite changes from shear or splitting fracture to bending failure with decreasing strain rate or increasing test temperature. The failure modes at the temperature near T g are mainly controlled by the metallic glass matrix due to the decrease in its viscosity at high temperature. Based on these multiple failure modes, the effects of test temperature and tungsten fiber volume fraction on deformation and fracture mechanisms are summarized.

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Section: B Shear or Splitting Fracture And Bending Failure Mechanismmentioning

confidence: 99%

“…[48] The strength of metallic glasses will correspondingly increase due to the change in its microstructure. [48] It is therefore supposed that the addition of tungsten fibers may increase the viscosity of the composite and maintains its high strength even at high temperature.…”

Section: B Shear or Splitting Fracture And Bending Failure Mechanismmentioning

confidence: 99%

Effects of tungsten fiber on failure mode of zr-based bulk metallic glassy composite

Zhang

Wang

et al. 2006

Metall Mater Trans A

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“…The issue of the pressure effect on crystallization of metallic glasses is of interest from a fundamental viewpoint, and also with respect to the applicability of these materials by deformation in the supercooled liquid region. 8 Ingots of the Zr 46.8 Ti 8.2 Cu 7.5 Ni 10 Be 27.5 bulk glass were produced by alloying the pure components by induction melting in a levitation device under purified Ar atmosphere and quenching by contact with water-cooled copper surface. This material was remelted in a fused silica crucible and die cast into a copper mold, to obtain 60 mm long rods with a diameter of 5 mm.…”

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confidence: 99%

Pressure effect on crystallization kinetics in Zr46.8Ti8.2Cu7.5Ni10Be27.5 bulk glass

Jiang¹,

Gerward²,

Xu³

2002

Applied Physics Letters

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Crystallization kinetics of a Zr46.8Ti8.2Cu7.5Ni10Be27.5 bulk glass in the supercooled liquid region have been investigated by performing in situ high-temperature and high-pressure x-ray diffraction measurements using synchrotron radiation. A pressure–time–temperature–transformation diagram, describing the onset of crystallization as a function of time during isothermal annealing under pressure, is presented. Different pressure dependences of crystallization kinetics in the temperature range for the glass have been observed and further be explained by a model of competing processes of the thermodynamic potential barrier of nucleation and the diffusion activation energy under pressure.

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“…Bulk metallic glasses meet the mechanical and chemical requirements ideally [1,2] and can be formed superplastically into microstructures [3,4]. The new task of high aspect ratios, however, can only be fulfilled with new processing routes for metallic glasses.…”

Section: Introductionmentioning

confidence: 99%