Crystallization behavior of Zr41Ti14Cu12.5Ni10Be22.5 bulk metallic glass under the action of high-density pulsing current

Qiu, Sheng-Bao; Yao, Kefu

doi:10.1016/j.jnoncrysol.2008.03.001

Cited by 15 publications

(15 citation statements)

References 30 publications

(32 reference statements)

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“…Besides, the other two weak diffraction peaks around 2θ=40° and 45° may be attributed to (1 1 1 1 0 1) and (2 1 0 0 0 1). Therefore, the primary precipitate in the crystallization process of the Vit1 BMGs is i-phase, which is similar to the results observed in the as-prepared Vit1 BMG sample annealed at a similar temperature and in primary crystallized Vit1 BMG sample induced directly by HDPC treatment [21,22]. According to ref.…”

Section: Experiments Proceduressupporting

confidence: 84%

“…The previous literature reported that the diffusion and rearrangement of atoms can be accelerated by the extra force generated from the action of HDPC treatment [16][17][18][19][20][21]27,28], which promotes the formation of medium/short range orders (MRO/SRO) and annihilation of free volumes [18,19], and eventually the structural relaxation of amorphous alloy [29]. Holland et al [30] have applied the high density direct current plus isothermal annealing treatment to study the crystallization behavior of Zr 42.6 Ti 12.4 Cu 11.25 Ni 10 Be 23.75 (Vit1A) BMG.…”

Section: Effects Of Crystallization Fractions On the Compressive Behamentioning

confidence: 99%

“…Recent studies reported that the crystallization of Fe-Si-B [17,18] and Fe-Si-Cu-Nb-B [19] glassy ribbons, and Zr-based BMG [20,21] can be significantly promoted by high-density pulsing current (HDPC) treatment. In the present paper, the HDPC pre-treated Zr 41 Ti 14 Cu 12.5 Ni 10 Be 22.5 (Vit1) BMGs have been isothermally annealed at the initial crystallization temperature for various times.…”

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confidence: 99%

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Effects of crystallization fractions on mechanical properties of Zr-based metallic glass matrix composites

Qiu

Yao

Gong

2010

Sci. China Phys. Mech. Astron.

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The Zr 41 Ti 14 Cu 12.5 Ni 10 Be 22.5 (at.%) bulk metallic glass composites with various crystallization fractions were prepared by pretreating the bulk metallic glassy samples with pulsing current, and then by isothermal annealing at near initial crystallization temperature for different periods of time. The precipitations and crystallization fractions were studied by X-ray diffraction (XRD) and differential scanning calorimetry (DSC), and their effects on mechanical properties of the composite were studied by microhardness, uniaxial compression test and scanning electron microscopy (SEM). The experimental results show that the primary precipitate is quasicrystalline phase and other metastable phases including Be 2 Zr, Zr 2 Cu and FCC would precipitate subsequently. In the initial crystallization process, in which the crystallization fraction increases from 0 to 8.2%, both fracture strength and plastic strain increase, with the maximum plastic strain up to 6.4%. When the crystallization fraction is larger than 8.2%, the fracture strength and the plastic strain decrease sharply. Furthermore, the alloy with low crystallization fraction is fractured by shearing, while for high crystallization fraction it is fractured by splitting and cleavage. The results show that the mechanical properties of the glassy alloy could be optimized by controlling the processing parameters. bulk metallic glass, pulsing current, crystallization fraction, plasticity, shear band PACS: 64.70.Pf, 81.40.Lm, 81.30.Mh, 61.50.KsBulk metallic glasses (BMGs) possess extraordinary properties, such as high strength and strong corrosion resistance, which has attracted much attention from scientists in the area of materials and physics [1][2][3]. Usually the strengths of BMGs come up to theoretical values, much higher than those of the crystalline alloys with the same chemical compositions [1-4]. But BMGs exhibit very limited global plasticity since they deform by shearing through the formation of shear bands that tend to form highly localized shear bands, resulting in crack formation and premature fracture [1][2][3][4][5]. Recently, however, investigations have reported that some BMGs exhibit large plastic strains in compression due to the generation of multiple shear bands [6][7][8][9][10][11]. This implies possibility to enhance the plasticity of BMGs through effectively hindering the highly localized shear along the primary shear bands and promoting the activation of shear bands. The reported results show that one way for improving the ductility of BMGs is to introduce second phases to BMGs by in-situ formation [6] or by isothermal annealing [7], which might benefit the generation of shear bands. For instance, Sun et al. [10] reported that 12% compressive plastic strain could be achieved by in-situ forming spherical crystals within the glassy matrix, while Hofmann et al. [11] reported that Zr-Ti-based bulk metallic glass matrix composites (BMGCs) display tensile plasticity of 8.6%-13.1%. However, effects of different second phases and their cryst...

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Section: Experiments Proceduressupporting

confidence: 84%

Section: Effects Of Crystallization Fractions On the Compressive Behamentioning

confidence: 99%

mentioning

confidence: 99%

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Effects of crystallization fractions on mechanical properties of Zr-based metallic glass matrix composites

Qiu

Yao

Gong

2010

Sci. China Phys. Mech. Astron.

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“…Soon it became one of the most familiar metallic alloys, and got relevant industrial application for its large dimension. Recently, more attention has been paid on the structural transformation of glassy alloys induced by external conditions, such as high-pressure annealing [2,3], electropulsing [4][5][6][7][8], etc. Electropulsing, or highdensity pulsing current (HDPC), was directly adopted to improve the mechanical properties [9], and induce the crystallization of Fe-Si-B amorphous ribbons [4] in early studies.…”

Section: Introductionmentioning

confidence: 99%

“…Electropulsing, or highdensity pulsing current (HDPC), was directly adopted to improve the mechanical properties [9], and induce the crystallization of Fe-Si-B amorphous ribbons [4] in early studies. In our recent work, the glass transition and crystallization of the Vit1 BMG [5,6], Fe 73.5 Cu 1 Nb 3 Si 13.5 B 9 [7], and Cu 60 Zr 28 Ti 12 [8] amorphous ribbons after pulsing current treatment have been studied, and the significant influence of pulsing current on crystallization process has been found. This paper will present further studies through XRD and DSC on the crystallization kinetics of Vit1 BMGs in as-cast state and pulsing current pretreatment states.…”

Section: Introductionmentioning

confidence: 99%

Crystallization kinetics of Zr41Ti14Cu12.5Ni10Be22.5 bulk metallic glass in pulsing current pretreatment states

Qiu

Yao

2009

Journal of Alloys and Compounds

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A Novel Approach to Analysis of Complex Crystallization Behavior in Zr-Based Bulk Metallic Glass by Non-isothermal Kinetics Studies

Biały

Hasiak

Łaszcz

2023

Metall Mater Trans A

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The complex crystallization behavior of the Zr40Ti15Cu10Ni10Be25 bulk metallic glass (BMG) produced by suction-casting method was studied with the non-isothermal DSC measurements with the heating rate from 5 to 40 K/min. Three exothermic phenomena were observed for the investigated material. The novel evaluation procedure for qualitative and quantitative analysis of intricate crystallization kinetics for Zr-based BMGs is proposed. The unusual deconvolution of the DSC curves based on a Gaussian function and a two-phase exponential decay function allowed for separate, detailed analysis of overlapped peaks. The activation energies for each crystallization stage were studied based on overall (Kissinger) and local (Kissinger–Akahira–Sunose) procedures. The KAS method applied separately for both low and high heating rates showed a significant difference in local activation energies. Finally, the local Avrami exponent evaluation revealed that the first two stages of crystallization are diffusion-controlled with mainly increasing nucleation rate, whereas the third crystallization is more growth-dominated.

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Crystallization behavior of Zr41Ti14Cu12.5Ni10Be22.5 bulk metallic glass under the action of high-density pulsing current

Cited by 15 publications

References 30 publications

Effects of crystallization fractions on mechanical properties of Zr-based metallic glass matrix composites

Effects of crystallization fractions on mechanical properties of Zr-based metallic glass matrix composites

Crystallization kinetics of Zr41Ti14Cu12.5Ni10Be22.5 bulk metallic glass in pulsing current pretreatment states

A Novel Approach to Analysis of Complex Crystallization Behavior in Zr-Based Bulk Metallic Glass by Non-isothermal Kinetics Studies

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