Novel application of the electrodeposition on bulk metallic glasses

Qiu, Sheng-Bao; Yao, Kefu

doi:10.1016/j.apsusc.2008.07.077

Cited by 42 publications

(14 citation statements)

References 22 publications

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“…It has been reported that the room temperature plasticity of Zr-based BMGs can be improved by various surface modification technologies including shot peening [188] and surface coating [189,190]. As Ti-based BMGs possess properties similar to Zr-based BMGs, these strategies can also be adopted to improve the room temperature plasticity of Ti-based BMGs.…”

Section: Surface Treatmentmentioning

confidence: 99%

Review on the Research and Development of Ti-Based Bulk Metallic Glasses

Gong

Deng

Jin

et al. 2016

Metals

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Abstract:Ti-based bulk metallic glasses (BMGs) are very attractive for applications because of their excellent properties such as high specific strength and high corrosion resistance. In this paper, we briefly review the current status of the research and development of Ti-based bulk metallic glasses. Emphasis is laid on glass-forming ability, mechanical properties, corrosion resistance, and biocompatibility.

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Section: Surface Treatmentmentioning

confidence: 99%

Review on the Research and Development of Ti-Based Bulk Metallic Glasses

Gong

Deng

Jin

et al. 2016

Metals

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“…A compressive strain as large as 80% for a previously brittle BMG was obtained under constrained conditions, by tuning the strain rate and aspect ratio [13]. Large plasticity has also been obtained by shot-peening [16], electrodeposition [17,18] and use of a metal sleeve [19]. Very recently it has been…”

mentioning

confidence: 99%

“…So to enhance the plasticity of BMGs, it is necessary to promote the activation of multiple shear bands [2][3][4][5][6][7][8][9][10] and hinder the localization and rapid propagation of shear bands [11][12][13][14][15][16][17][18][19]. Indeed much important progress has been made in enhancing the ductility of BMGs by various ways [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19], such as by introducing second phase particles on the nanoscale/microscale [2][3][4][5] or solid solution particles [6] which restrict the severe localization and rapid propagation of shear bands, the as-prepared BMG composites could exhibit a global plasticity of about 7% [7].…”

mentioning

confidence: 99%

“…Indeed much important progress has been made in enhancing the ductility of BMGs by various ways [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19], such as by introducing second phase particles on the nanoscale/microscale [2][3][4][5] or solid solution particles [6] which restrict the severe localization and rapid propagation of shear bands, the as-prepared BMG composites could exhibit a global plasticity of about 7% [7]. Because the partially relieved local heating and hindrance of the propagation of shear bands, both the strength and the ductility of a Zr-based BMG are enhanced at cryogenic temperatures [12].…”

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confidence: 99%

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Work toughening effect in Zr41Ti14Cu12.5Ni10Be22.5 bulk metallic glass

2011

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Work hardening is a well-known phenomenon occurring in crystalline metals during deformation, which has been widely used to increase the strength of metals although their ductility is usually reduced simultaneously. Here we report that the plastic strain of Zr 41 Ti 14 Cu 12.5 Ni 10 Be 22.5 (at.%) bulk metallic glasses has been increased from 0.3% for the as-cast sample to 2.5%-8.0% for samples that have experienced pre-deformation under constrained conditions. The pre-deformed glassy alloys possess more free volume and abundant introduced shear bands, which are believed to promote the activation of shear bands in post-deformation and result in an increase in plasticity. The orientation of the pre-introduced shear bands relative to the loading direction will affect the deformation behavior of pre-deformed samples. The present results show that pre-deformation of this glassy alloy will result in work toughening. This work toughening effect can be removed by isothermal annealing at a sub-T g (glass transition) temperature, which causes annihilation of free volume and healing of shear bands. It is well known that most bulk metallic glasses (BMGs) possess super-high strength but very low global plasticity. The accepted reason for the limited plasticity of BMGs is that BMGs possess a tendency to form highly-localized shear bands which result in early fracture of the materials. It is obvious that deformation behavior of BMGs is quite different from crystalline metals, in which plastic deformation corresponds to the generation and motion of large numbers of dislocations. As the dislocation density increases with the plastic deformation, the interactions among dislocations are also increased, resulting in an increase in the resistance to dislocation movement. Then, further deformation requires an increase in the applied stress. This is the so-called "strain hardening" or "work hardening". However, since there are no dislocations in glassy alloys, absolutely no strain hardening resulting from interactions among dislocations can be observed in BMGs. So it is very difficult for glassy alloys to deform uniformly. Instead, highly localized shear bands [1] form easily during the deformation process, resulting in limited global plasticity of BMG. So to enhance the plasticity of BMGs, it is necessary to promote the activation of multiple shear bands [2-10] and hinder the localization and rapid propagation of shear bands [11][12][13][14][15][16][17][18][19]. Indeed much important progress has been made in enhancing the ductility of BMGs by various ways [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19], such as by introducing second phase particles on the nanoscale/microscale [2][3][4][5] or solid solution particles [6] which restrict the severe localization and rapid propagation of shear bands, the as-prepared BMG composites could exhibit a global plasticity of about 7% [7]. Because the partially relieved local heating and hindrance of the propagation of shear bands, both the strength and the ductility of a Zr-bas...

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“…Yu et al used Cu tubes as geometric constraints to improve the plasticity of a Zr-based BMG, hereafter, the surface modification strategy was often called geometric constraint method [27]. Following similar strategy, Qiu et al used electroplating to coat Zr-based BMG with Cu coating, and found that the thicker coating shows greater toughening effect [28]. Then, the thickening of the coating become the focus in such studies, stimulating the development of Cu/Ni composite coating [29].…”

Section: Introductionmentioning

confidence: 99%

Improved Plasticity of Ti-Based Bulk Metallic Glass at Room Temperature by Electroless Thin Nickel Coating

Wang¹,

Hu²,

Zhao³

et al. 2017

Metals

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By restricting the dilated deformation, surface modification can stimulate multiple shear banding and improve the plasticity of bulk metallic glasses (BMGs). Aimed at modifying the surface of BMGs by thin layers, a crystalline Ni coating with ultrafine grains was coated on the surface of a Ti-based BMG by electroless plating. With a thickness of about 10 µm, the prepared thin coating could effectively limit the fast propagation of primary shear bands and stimulate the nucleation of multiple shear bands. As a result, the compression plasticity of the coated Ti-based BMG was improved to about 3.7% from near 0% of the non-coated BMG. Except for a small amount of Ni coating was adhered to the BMG substrate after fracture, most of the coatings were peeled off from the surface. It can be attributed to the abnormal growth of some coarse grains/particles in local region of the coating, which induces a large tensile stress at the interface between the coating and the BMG substrate. It is suggested that, for electroless nickel plating, improving the adhesive bonding strength between the coating and the substrate has a better geometric restriction effect than simply increasing the thickness of the coating.

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Novel application of the electrodeposition on bulk metallic glasses

Cited by 42 publications

References 22 publications

Review on the Research and Development of Ti-Based Bulk Metallic Glasses

Review on the Research and Development of Ti-Based Bulk Metallic Glasses

Work toughening effect in Zr41Ti14Cu12.5Ni10Be22.5 bulk metallic glass

Improved Plasticity of Ti-Based Bulk Metallic Glass at Room Temperature by Electroless Thin Nickel Coating

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