Mechanical behavior of Fe65.5Cr4Mo4Ga4P12C5B5.5 bulk metallic glass

Stoica, M.; Eckert, J.; Roth, S.; Zhang, Z.F.; Schultz, L.; Wang, W.H.

doi:10.1016/j.intermet.2004.12.016

Cited by 109 publications

(47 citation statements)

References 21 publications

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“…1,2 The high strength of BMGs is often accompanied by more or less pronounced plastic deformation and their deformation and fracture mechanisms are quite different from crystalline materials. [3][4][5][6][7][8][9][10][11][12] At temperatures below or around the glass transition and rather high strain rates metallic glasses deform by the formation of localized shear bands, [3][4][5]8 whereas homogeneous flow of the supercooled liquid is observed at elevated temperatures and/or low strain rates. 13,14 For the former case, it was previously considered that the compressive fracture usually proceeds along a shear plane inclined by 45°to the loading axis, 15 i.e., the maximum shear stress plane.…”

Section: Introductionmentioning

confidence: 99%

Strain distribution in Zr64.13Cu15.75Ni10.12Al10 bulk metallic glass investigated by in situ tensile tests under synchrotron radiation

Stoica

Das

Bednarčı́k

et al. 2008

Journal of Applied Physics

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We report on the evolution of the atomic-scale strain tensor of ductile Zr64.13Cu15.75Ni10.12Al10 bulk metallic glass under tensile loading by using x-ray synchrotron radiation. The same kind of samples was previously investigated under compressive loading and revealed yielding at 1690 MPa together with large deformability of up to 160% strain. In tension the samples fracture at a lower stress, 1500 MPa, with no sign of yielding or plastic deformation. With no macroplasticity observed under tension, large differences in the elastic constants obtained from the strain tensor and from ultrasonic sound velocity measurements are revealed. This paper presents in detail the measuring procedure as well as the calculation of the tensile tensor and pair distribution functions of Zr64.13Cu15.75Ni10.12Al10 at different stages of deformation. The results are discussed in comparison with other reported data obtained from x-ray diffraction measurements using synchrotron radiation.

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Section: Introductionmentioning

confidence: 99%

Strain distribution in Zr64.13Cu15.75Ni10.12Al10 bulk metallic glass investigated by in situ tensile tests under synchrotron radiation

Stoica

Das

Bednarčı́k

et al. 2008

Journal of Applied Physics

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“…[3][4][5][6][7] Bulk metallic glasses have strengths approaching the theoretical limit, 8 but their plasticity at room temperature is typically very low. In uniaxial tension, the plastic strain is almost zero.…”

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confidence: 99%

Mechanical response of metallic glasses: Insights from in-situ high energy X-ray diffraction

Stoica¹,

Das

Bednarčı́k

et al. 2010

JOM

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How would you… INTRODUCTIONDue to the lack of crystalline structure, bulk metallic glasses (BMGs) may achieve interesting properties, including high strength and high hardness, excellent corrosion resistance, high wear resistance, very good soft magnetic properties, and, depending on composition, biocompatibility.1,2 The high strength of BMGs is sometimes accompanied by plastic deformation and their deformation and fracture mechanisms are quite different from crystalline materials. [3][4][5][6][7] Bulk metallic glasses have strengths approaching the theoretical limit, 8 but their plasticity at room temperature is typically very low. In uniaxial tension, the plastic strain is almost zero. 9 For most of the known BMGs, plastic strain at room temperature is limited, less than 2%, even under compression, resulting from pronounced shear localization and work softening. The lack of plasticity makes BMGs prone to catastrophic failure in Mechanical Response of Metallic Glasses: Insights from In-situ High Energy X-ray DiffractionMihai Stoica, Jayanta Das, Jozef Bednarčik, Gang Wang, Gavin Vaughan, Wei Hua Wang, Jürgen Eckert load-bearing conditions and restricts their application. This also hinders the precise study of some fundamental issues in glasses, such as the deformation mechanism and the dynamics of plastic deformation, in which large plasticity is needed for detailed analysis.9 Plastic deformation of metallic glasses at room temperature occurs through the formation and evolution of shear bands and is localized in thin shear bands.10 Therefore, brittleness is regarded as an intrinsic defect of metallic glasses.Many methods have been developed and employed to rule out the deformation mechanisms characteristic to BMGs.11 Recently, characterization of amorphous materials by diffraction methods for the purpose of strain scanning was established.12 Several glasses were investigated since then, using different synchrotron sources: HASYLAB at Deutsches Elektronen-Synchrotron (DESY) Hamburg, Germany; European Synchrotron Radiation Facilities (ESRF) Grenoble, France; or Advanced Photon Source (APS) at Argonne National Laboratory, USA. Monochromatic hard x-rays with energies at 80-100 keV were used for these experiments.Ex-situ compression tests are usually performed to study the mechanical behavior of BMGs. This method is relatively simple and suitable for small samples. Tensile tests have technical limitations. First, for such tests a dog-bone shaped plate or rod sample is necessary, with a length of a few centimeters. This requires a BMG sample with quite large geometrical dimensions, which cannot be achieved by a poor glass former. The sample should be homogeneous, but in practice some small voids (as pores or oxides inclusions) may be present upon casting. Another limitation comes from the device used for tests-it is quite diffi cult to create a proper clamping system. Due to the difference in hardness between BMGs and the hardened steel used for tools, the BMG sample tends to slide from the grips.See the sidebar for ...

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“…(3), the material properties of Vit 1 BMG are t y ¼ 1 GPa, r ¼ 6125 kg m À3 and _ z ¼ 2400 m s À1 (the elastic shear wave speed). As the shear band is matured, the momentum diffusion stops and its transport distance z is equal to the shear-band spacing [26,30,31], which roughly ranges from 1 to 100 mm [9e15] and is sensitive to the loading mode [41,42], sample geometry [36] and material composition [43]. According to experimental observations, we choose the spacing as in the order of 50 mm.…”

Section: Theoretical Analysis and Discussionmentioning

confidence: 99%

Dynamic fragmentation induced by network-like shear bands in a Zr-based bulk metallic glass

et al. 2015

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Mechanical behavior of Fe65.5Cr4Mo4Ga4P12C5B5.5 bulk metallic glass

Cited by 109 publications

References 21 publications

Strain distribution in Zr64.13Cu15.75Ni10.12Al10 bulk metallic glass investigated by in situ tensile tests under synchrotron radiation

Strain distribution in Zr64.13Cu15.75Ni10.12Al10 bulk metallic glass investigated by in situ tensile tests under synchrotron radiation

Mechanical response of metallic glasses: Insights from in-situ high energy X-ray diffraction

Dynamic fragmentation induced by network-like shear bands in a Zr-based bulk metallic glass

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