Tensile properties of glassy MgZnCa wires and reliability analysis using Weibull statistics

Zberg, Bruno; Arata, Edward R.; Uggowitzer, Peter J.; Löffler, Jörg F.

doi:10.1016/j.actamat.2009.03.028

Cited by 98 publications

(46 citation statements)

References 31 publications

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“…A similar observation was made in a series of in situ SEM tensile tests on amorphous metallic wires, where homogeneous plastic deformation before shear band activity was observed. 37 At large depth of penetration, deformation through shear bands occurs, amply reflected by the pop-ins in the P-h curves in Fig. 1 as well as by the observation of indents in Fig.…”

Section: B Advantages Of the Indentation Methodsmentioning

confidence: 99%

Free-volume dependent pressure sensitivity of Zr-based bulk metallic glass

et al. 2009

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Instrumented indentation experiments on a Zr-based bulk metallic glass (BMG) in as-cast, shot-peened and structurally relaxed conditions were conducted to examine the dependence of plastic deformation on its structural state. Results show significant differences in hardness, H, with structural relaxation increasing it and shot peening markedly reducing it, and slightly changed morphology of shear bands around the indents. This is in contrast to uniaxial compressive yield strength, s y , which remains invariant with the change in the structural state of the alloys investigated. The plastic constraint factor, C = H/s y , of the relaxed BMG increases compared with that of the as-cast glass, indicating enhanced pressure sensitivity upon annealing. In contrast, C of the shot-peened layer was found to be similar to that observed in crystalline metals, indicating that severe plastic deformation could eliminate pressure sensitivity. Microscopic origins for this result, in terms of shear transformation zones and free volume, are discussed.

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Section: B Advantages Of the Indentation Methodsmentioning

confidence: 99%

Free-volume dependent pressure sensitivity of Zr-based bulk metallic glass

et al. 2009

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“…Ca also enhances the strength, castability and creep and corrosion resistance of Mg alloys [3], whereas the addition of Zn to binary Mg-Ca alloys improves the age hardening response [4]. While many researchers [2][3][4] have concentrated on the Mg-rich compositions, a biocompatible metallic glass has recently been found by Zberg et al [5,6] in Ca-Mg-Zn alloys containing approximately 28 at.% Zn. This metallic glass shows great potential for the development of biodegradable implants.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of the Ca–Mg–Zn system using diffusion couples and key alloys

Zhang

Kevorkov

Bridier

et al. 2011

Science and Technology of Advanced Materials

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Nine diffusion couples and 32 key samples were prepared to map the phase diagram of the Ca-Mg-Zn system. Phase relations and solubility limits were determined for binary and ternary compounds using scanning electron microscopy, electron probe microanalysis and x-ray diffraction (XRD). The crystal structure of the ternary compounds was studied by XRD and electron backscatter diffraction. Four ternary intermetallic (IM) compounds were identified in this system: Ca 3 Mg x Zn 15−x (4.6 x 12 at 335• C, IM1), Ca 14.5 Mg 15.8 Zn 69.7 (IM2), Ca 2 Mg 5 Zn 13 (IM3) and Ca 1.5 Mg 55.3 Zn 43.2 (IM4). Three binary compounds were found to have extended solid solubility into ternary systems: CaZn 11 , CaZn 13 and Mg 2 Ca form substitutional solid solutions where Mg substitutes for Zn atoms in the first two compounds, and Zn substitutes for both Ca and Mg atoms in Mg 2 Ca. The isothermal section of the Ca-Mg-Zn phase diagram at 335• C was constructed on the basis of the obtained experimental results. The morphologies of the diffusion couples in the Ca-Mg-Zn phase diagram at 335• C were studied. Depending on the terminal compositions of the diffusion couples, the two-phase regions in the diffusion zone have either a tooth-like morphology or contain a matrix phase with isolated and/or dendritic precipitates.

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“…Conversely, MgZnCa bulk metallic glass composites (BMGCs) were found to present much lower corrosion rates than the other Mg-based crystalline alloys. Unfortunately, monolithic MgZnCa bulk metallic glasses are quite brittle, limiting their further applications [2][3][4][5][6]. There have hitherto been a number of studies reporting on effective methods that enhance the strength as well as the plasticity of Mg-based BMGCs through the dispersion of ductile metallic particles such as those of Mo, Fe, Nb, and Ti [7][8][9][10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Mechanical Properties of MgZnCa Bulk Metallic Glass Composites with Ti-Particle Dispersion

Wong¹,

Lee

Tsai

et al. 2016

Metals

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Rod samples of Mg 60 Zn 35 Ca 5 bulk metallic glass composites (BMGCs) dispersed with Ti particles have been successfully fabricated via injection casting. The glass forming ability (GFA) and the mechanical properties of these Mg-based BMGCs have been systematically investigated as a function of the volume fraction (V f ) of Ti particles. The results showed that the compressive ductility increased with V f . The mechanical performance of these BMGCs, with up to 5.4% compressive failure strain and 1187 MPa fracture strength at room temperature, can be obtained for the Mg-based BMGCs with 50 vol % Ti particles, suggesting that these dispersed Ti particles can absorb the energy of the crack propagations and can induce branches of the primary shear band into multiple secondary shear bands. It follows that further propagation of the shear band is blocked, enhancing the overall plasticity.

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Tensile properties of glassy MgZnCa wires and reliability analysis using Weibull statistics

Cited by 98 publications

References 31 publications

Free-volume dependent pressure sensitivity of Zr-based bulk metallic glass

Free-volume dependent pressure sensitivity of Zr-based bulk metallic glass

Experimental study of the Ca–Mg–Zn system using diffusion couples and key alloys

Enhanced Mechanical Properties of MgZnCa Bulk Metallic Glass Composites with Ti-Particle Dispersion

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