Yielding and intrinsic plasticity of Ti–Zr–Ni–Cu–Be bulk metallic glass

Fornell, Jordina; Concustell, A.; Suriñach, S.; Li, W.H.; Cuadrado, Núria; Gebert, A.; Baró, María Dolors; Sort, Jordi

doi:10.1016/j.ijplas.2008.11.002

Cited by 107 publications

(74 citation statements)

References 69 publications

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“…As seen in Fig. 2, the curve from D-P criterion prediction is close to that by the M-C criterion in most regime of the normal stress, which explains why both criteria can capture the deformation of metallic glasses in certain boundary-value problems [21][22][23][24]. The D-P and M-C values are very consistent with Lewandowiski's report [3] using superimposed method.…”

Section: Resultssupporting

confidence: 83%

“…We hence use the term ''failure" instead of ''yielding" to describe the critical combinations of shear and normal stress which trigger fracture in Zr 41 Ti 14 Cu 12.5 Ni 10 Be 22.5 . It is noted that there could be possibilities when shear banding does not lead to catastrophic failure, for example in bending tests [37] and in indentation experiments [21][22][23][24]. In those states of stress, ''yielding" apparently differs from ''failure".…”

Section: Resultsmentioning

confidence: 99%

“…Both parameters could be determined from experiments. As D-P criterion was also applied to the deformation of metallic glasses to capture its pressure dependent failure and plastic flow behavior [22][23][24]. We present the predictions by the D-P criterion with A = 1.066 ± 0.018 GPa and B = À0.016 ± 0.008 from the least square fitting using Eq.…”

Section: Resultsmentioning

confidence: 99%

“…Instrumented indentation and finite element simulations have also been employed to examine the pressure sensitivity of strength in BMGs [21][22][23][24] and they all suggested that pressure sensitive M-C or D-P [25] were better suited to capture deformation in structures with complex stress state. Finite-element modeling with embedded M-C criterion is able to captured typical features seen from systematic experimental characterizations of BMGs [26].…”

Section: Introductionmentioning

confidence: 99%

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Spiral fracture in metallic glasses and its correlation with failure criterion

Lei

Wei

2015

Acta Materialia

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a b s t r a c tWe report the observation of spiral fracture of the metallic glass Zr 41 Ti 14 Cu 12.5 Ni 10 Be 22.5 (at.%) subjected to both shear and normal stresses. The spiral angle (that between the spiral line and the loading axis) increases as we gradually change the normal stress from tensile (positive) to compressive (negative). The spiral nature of the fractured surface leads to a left-handed helix fractography pattern in tension, and a right-handed helix in compression. The Mohr-Coulomb type of failure is essential for the unique spiral fracture. The use of spiral angles resulted from torsion-tension experiments provide another novel experimental strategy to examine the failure criterion as well as stress state dependence of deformation mechanisms which lead to failure in metallic glasses.

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Section: Resultssupporting

confidence: 83%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Spiral fracture in metallic glasses and its correlation with failure criterion

Lei

Wei

2015

Acta Materialia

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“…Ti-based bulk metallic glasses (BMGs), as promising lightweight structural materials, have attracted more and more attention during recent years [3][4][5][6][7][8][9][10][11][12]. Ti 40 Zr 25 Ni 8 Cu 9 Be 18 BMG, as one of the best Ti-based BMGs known today, was found to exhibit a good combination of glass forming ability (GFA, the maximum diameter could be 8 mm) and mechanical properties (high compressive strength and large compressive plastic strain) [9,13,14], which could be a potential structural material.…”

Section: Introductionmentioning

confidence: 99%

Structural relaxation of Ti40Zr25Ni8Cu9Be18 bulk metallic glass

Mei

Soubeyroux

Blandin

et al. 2011

Journal of Non-Crystalline Solids

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The enthalpy relaxation behavior of Ti 40 Zr 25 Ni 8 Cu 9 Be 18 bulk metallic glass follows the general characteristics of that for amorphous materials although its unique quenched-in nuclei/amorphous matrix structure: the annealing time dependence of recovery enthalpy follows a stretched exponential function with the mean relaxation time obeying an Arrhenius law, which may be due to the longer incubation time for crystallization τ inc than the relaxation time τ leading to the enthalpy relaxation Two parameters, β g and τ g , representing the stretching exponent and the mean structural relaxation time at the calorimetric glass transition temperature, respectively, are correlated with glass forming ability and thermal stability, respectively. The high value of β g for Ti 40 Zr 25 Ni 8 Cu 9 Be 18 BMG that is much higher than 0.84 and approaches unity reveals its good glass forming ability; however, its low value of τ g indicates a worse thermal stability compared with typical BMGs.

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The Influence of Deformation‐Induced Martensitic Transformations on the Mechanical Properties of Nanocomposite Cu‐Zr‐(Al) Systems

et al. 2010

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The microstructure and mechanical properties of Cu46.5Zr48.5Al5 and Cu50Zr50 rods are investigated. Cu50Zr50 is composed of nanostructured martensitic phases, while the Cu46.5Zr48.5Al5 alloy comprises micrometer‐sized dendrites (mainly austenitic phase) in an amorphous matrix. Both samples show considerable plasticity under compression and a work‐hardening ability. Martensitic phase transformations during deformation play a significant role with regard to the mechanical properties. Nanoindentation tests on the different phases comprising the alloys indicate that the amorphous matrix in Cu46.5Zr48.5Al5 is harder than the crystalline phases and has a less‐pronounced indentation‐size effect.

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Yielding and intrinsic plasticity of Ti–Zr–Ni–Cu–Be bulk metallic glass

Cited by 107 publications

References 69 publications

Spiral fracture in metallic glasses and its correlation with failure criterion

Spiral fracture in metallic glasses and its correlation with failure criterion

Structural relaxation of Ti40Zr25Ni8Cu9Be18 bulk metallic glass

The Influence of Deformation‐Induced Martensitic Transformations on the Mechanical Properties of Nanocomposite Cu‐Zr‐(Al) Systems

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