Ultrasonic Vibration Facilitates the Micro-Formability of a Zr-Based Metallic Glass

Han, Guangchao; Zhuo, Peng; Xu, Linzhi; Li, Ning

doi:10.3390/ma11122568

Cited by 14 publications

(7 citation statements)

References 28 publications

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“…Zr-based MGs are typical MG systems that show superplastic deformation at room temperature [2][3][4]. It has been proved that Zr 35 Ti 30 Cu 8.25 Be 26.75 can be microformed by using the ultrasonic-vibration technique [5]. Lateral extrusion experiments of the Zr 55 Cu 30 Al 10 Ni 5 MG with low-frequency vibration also reveal an enhanced micro-formability under vibratory loading [6].…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic-assisted plastic flow in a Zr-based metallic glass

Yuan

Pang

et al. 2020

Sci. China Mater.

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Ultrasonic vibration can be used for the micromolding of metallic glasses (MGs) due to stress-softening and fast surface-diffusion effects. However, the structural rearrangement under ultrasonic vibration and its impact on the mechanical response of metallic glasses remain a puzzle. In this work, the plastic flow of the Zr 35 Ti 30 Cu 8.25 Be 26.75 metallic glass with the applied ultrasonic-vibration energy of 140 J was investigated by nanoindentation. Both Kelvin and Maxwell-Voigt models have been adopted to analyze the structural evolution during the creep deformation. The increase of the characteristic relaxation time and the peak intensity of relaxation spectra can be found in the sample after ultrasonic vibration. It effectively improves the activation energy of atomic diffusion during the glass transition (E g ) and the growth of the crystal nucleus (E p ). A more homogenous plastic deformation with a weak loading-rate sensitivity of stress exponent is observed in the ultrasonic-vibrated sample, which coincides with the low pile-up and penetration depth as shown in the cross profile of indents. The structural rearrangement under resonance actuation demonstrated in this work might help us better understand the defect-activation mechanism for the plastic flow of amorphous systems.

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Section: Introductionmentioning

confidence: 99%

Ultrasonic-assisted plastic flow in a Zr-based metallic glass

Yuan

Pang

et al. 2020

Sci. China Mater.

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“…This behavior allows to BMGs to have a high viscosity, high formability and be insensitive to heterogeneous influences, which is comparable to plastics [19]. As a result, many TPF-based processes [20] were developed for BMGs in SCLR to achieve high dimensional accuracy in complex geometries, especially in the micro-forming industry [21,22].…”

Section: Preparation Of Micro-channel and Sharklet Diesmentioning

confidence: 99%

Bio-Inspired Functional Surface Fabricated by Electrically Assisted Micro-Embossing of AZ31 Magnesium Alloy

Wang

et al. 2020

Materials

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Developing bio-inspired functional surfaces on engineering metals is of extreme importance, involving different industrial sectors, like automotive or aeronautics. In particular, micro-embossing is one of the efficient and large-scale processes for manufacturing bio-inspired textures on metallic surfaces. However, this process faces some problems, such as filling defects and die breakage due to size effect, which restrict this technology for some components. Electrically assisted micro-forming has demonstrated the ability of reducing size effects, improving formability and decreasing flow stress, making it a promising hybrid process to control the filling quality of micro-scale features. This research focuses on the use of different current densities to perform embossed micro-channels of 7 μm and sharklet patterns of 10 μm in textured bulk metallic glass dies. These dies are prepared by thermoplastic forming based on the compression of photolithographic silicon molds. The results show that large areas of bio-inspired textures could be fabricated on magnesium alloy when current densities higher than 6 A/mm2 (threshold) are used. The optimal surface quality scenario is obtained for a current density of 13 A/mm2. Additionally, filling depth and depth–width ratio nonlinearly increases when higher current densities are used, where the temperature is a key parameter to control, keeping it below the temperature of the glass transition to avoid melting or an early breakage of the die.

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“…To analyze the ultrasonic micro-forming characteristics of different ultrasonic vibration modes, the ultrasonic vibration of micro-forming tool or workpiece would better be superimposed with the same ultrasonic system. To fit for this special requirement, a self-developed 19.5 kHz ultrasonic vibration system was designed to excite the tool or workpiece respectively [14,15]. The ultrasonic vibration system included a TJS-3000 ultrasonic generator, two YP5020-4D ultrasonic transducers, two step ultrasonic horns (which were all from Hangzhou Successful Ultrasonic Equipment Co. Ltd, Hangzhou, China), and a special self-developed porous sonotrode.…”

Section: Experimental Set-upmentioning

confidence: 99%

“…vibration system was designed to excite the tool or workpiece respectively [14,15]. The ultrasonic vibration system included a TJS-3000 ultrasonic generator, two YP5020-4D ultrasonic transducers, two step ultrasonic horns (which were all from Hangzhou Successful Ultrasonic Equipment Co. Ltd, Hangzhou, China), and a special self-developed porous sonotrode.…”

Section: Experimental Set-upmentioning

confidence: 99%

Research on the Micro-Extrusion Process of Copper T2 with Different Ultrasonic Vibration Modes

Lei

Zhang

et al. 2019

Metals

Self Cite

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As an effective method for the fabrication of miniature metallic parts, the development of micro-forming process (MFP) is still restricted by the existence of size effect. To improve the micro-forming performance of metal material, ultrasonic vibration assisted MFP had been studied extensively for its superiorities in improving materials flow stress and reducing interfacial friction. However, from the literature available, the high frequency vibration was usually found to be superimposed on the forming tool while seldom on the workpiece. Our group developed a special porous sonotrode platform which can realize tool vibration and workpiece ultrasonic vibration independently. In this work, ultrasonic micro-extrusion experiments for copper T2 material under tool vibration and the workpiece vibration condition, respectively, were conducted for comparing the micro-forming characteristic of different vibration modes. The micro-extrusion experiment results of copper T2 show that the lower extrusion flow stress, the higher micro-extrusion formability and surface micro-hardness, and more obvious grain refinement phenomenon can be obtained under the workpiece vibration condition compared with that of tool vibration. These findings may enhance our understanding on different ultrasonic forming mechanisms and energy transmission efficiency under two different vibration modes.

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Ultrasonic Vibration Facilitates the Micro-Formability of a Zr-Based Metallic Glass

Cited by 14 publications

References 28 publications

Ultrasonic-assisted plastic flow in a Zr-based metallic glass

Ultrasonic-assisted plastic flow in a Zr-based metallic glass

Bio-Inspired Functional Surface Fabricated by Electrically Assisted Micro-Embossing of AZ31 Magnesium Alloy

Research on the Micro-Extrusion Process of Copper T2 with Different Ultrasonic Vibration Modes

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