Free-volume-induced enhancement of plasticity in a monolithic bulk metallic glass at room temperature

Chen, Lianyi; Setyawan, Albertus D.; Kato, Hidemi; Inoue, Akihisa; Zhang, G.Q.; Saida, Junji; Wang, X.D.; Cao, Q.P.; Jiang, Jianzhong

doi:10.1016/j.scriptamat.2008.02.025

Cited by 119 publications

(42 citation statements)

References 37 publications

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“…The mechanical properties of our Zr-Cu glassy coatings ( Figure 9) confirm that lower free volume density enhance the hardness and Young's modulus as a function of copper content [35,36]. Therefore, the free volume seems to have an effect on the mechanical properties of metallic glass [37], while on corrosion resistance this effect has not yet been elucidated in prior studies [38].…”

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confidence: 53%

Insights on the Role of Copper Addition in the Corrosion and Mechanical Properties of Binary Zr-Cu Metallic Glass Coatings

et al. 2017

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Abstract:The effect of copper addition on the corrosion resistance and mechanical properties of binary Zr 100-x Cu x (x = 30, 50, 80, 90 at.%) glassy coatings was investigated by means of electrochemical measurements, scanning electron microscopy (SEM), energy dispersive analysis spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS) and nano-indentation techniques. The corrosion resistance in 0.01 M deaerated H 2 SO 4 solution and the mechanical properties of the Zr-Cu glassy coatings depend considerably upon the copper content in the glassy matrix. The top surfaces of the Zr-Cu coatings with lower Cu content were covered by a compact protective ZrO 2 passive film. The competition between the oxidation of Zr atoms (ZrO 2 film formation) and the oxidation-dissolution of Cu atoms assumed the most important role in the electrochemical behavior of the Zr-Cu glassy coatings. The generation of ZrO 2 on the surface benefited the formation of passive film; and the corrosion resistance of the metallic glass coatings depended on the coverage degree of ZrO 2 passive film. The evolution of free volume affected both the mechanical and corrosion behaviors of the Zr-Cu glassy coatings.

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confidence: 53%

Insights on the Role of Copper Addition in the Corrosion and Mechanical Properties of Binary Zr-Cu Metallic Glass Coatings

et al. 2017

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“…32) For metallic glasses with different compositions, even through their free volumes are identical, they may have a distinct degree of metallic bonding and dissimilar plasticity. In metallic glass with the same chemical composition but different processing conditions such as quenching rate, 33,34) annealing 35,36) and mechanical pre-deformation, 37,38) a good correlation between the free volume content and the plasticity can usually be found. Contrasting with the findings in this work, it can be concluded that although free volume in metallic glass changes with chemical composition, free volume alone cannot fully describe the influence of the composition on the structure and the mechanical properties of metallic glasses with different compositions.…”

Section: Resultsmentioning

confidence: 99%

Effect of Alloying Elements with Positive Heat of Mixing on the Free Volume and Compressive Plasticity in ZrCoCuAl Bulk Metallic Glasses

2013

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In this work, the effect of alloying an element with positive heat of mixing with Co on the free volume and compressive plasticity of a ZrCoAl bulk metallic glass was investigated. By substituting Co with Cu, fully amorphous rods of 2 mm diameter can be obtained over a wide composition range. With the addition of Cu, the free volume changes from 0.09 to 0.18%, and the fracture plastic strain changes from 1 to 12.4%. However, there is no strong correlation between the free volume and the compressive plasticity. In addition to the free volume content, other factors such as the size, shape and distribution of the free volume sites may also affect the plasticity of BMGs.

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“…It would be adverse to the plasticity. Usually, MGs of good plasticity can be obtained by using a high cooling rate, because during the process more randomly distributed free volume or wider FVD is inherited from the liquid [15,16,22,32]. Through compositional changes, Liu et al [17] designed super-plastic bulk metallic glasses which are composed of hard regions surrounded by soft regions.…”

Section: Resultsmentioning

confidence: 99%

“…We may expect that by controlling the free volume, large plasticity can be achieved in MGs. Recently, Chen et al [18,22] reported the enhancement of plasticity in monolithic MGs attributed to a large amount of randomly distributed free volume induced by minor alloying or a high cooling rate. Jiang and Dai [23] also found that the atomic structure with large packing dispersion within a MG leads to a bigger bulk-shear modulus ratio in favor of its global plasticity.…”

Section: Introductionmentioning

confidence: 99%

How does the initial free volume distribution affect shear band formation in metallic glass?

Chen

Jiang

Dai

2011

Sci. China Phys. Mech. Astron.

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Introducing heterogeneities into the structure is an effective way to enhance the plasticity in metallic glasses (MGs). As natural heterogeneity, the original randomly distributed free volume in MGs has been found to be in favor of plasticity. However, the exact correlation between the free volume distribution and mechanical response is still unclear. In this paper, we investigate the shear banding in MGs with different structural disorders, characterized by both the free volume concentration (FVC) and the free volume dispersion (FVD). It is found that, either high FVC or wide FVD leads to low activation stress of shear band; wide FVD promotes the multiplication of shear bands but high FVC restricts it. It reveals that the yield strength in MGs is dependent on the amount of free volume while the plasticity mainly relies on the distribution. An optimum combination of the two aspects probably helps to design a MG of both good plasticity and high strength. metallic glass, free volume, shear band, yield strength

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Free-volume-induced enhancement of plasticity in a monolithic bulk metallic glass at room temperature

Cited by 119 publications

References 37 publications

Insights on the Role of Copper Addition in the Corrosion and Mechanical Properties of Binary Zr-Cu Metallic Glass Coatings

Insights on the Role of Copper Addition in the Corrosion and Mechanical Properties of Binary Zr-Cu Metallic Glass Coatings

Effect of Alloying Elements with Positive Heat of Mixing on the Free Volume and Compressive Plasticity in ZrCoCuAl Bulk Metallic Glasses

How does the initial free volume distribution affect shear band formation in metallic glass?

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