Electron microscopy of bulk metallic glass machining chips

Bakkal, Mustafa

doi:10.1016/j.jnoncrysol.2009.07.018

Cited by 5 publications

(4 citation statements)

References 17 publications

(25 reference statements)

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“…Several studies implied the limitation to cut BMG using conventional machining at dry condition, namely high cutting forces, high cutting temperature, and excessive tool wear [10,11]. The high cutting forces and temperature can induce crystallization on amorphous body occurred on both machined surface and chip, subsequently deteriorate the amorphous nature of materials and lower its application [12,13]. De-spite the fact that the problem can be minimized by applying lower cutting speed and cutting fluid during machining, but for processing Zr 54 Al 17 Co 29 BMG having low GFA (compared with BMG used on the preceding studies), the crystallization tends to occur easily through conventional machining.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Discharge Current and Pulse-On Time on Biocompatible Zr-based BMG Sinking-EDM

et al. 2020

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AbstractThe machinability information of Zr-based bulk metallic glasses (BMGs) are recently limited but essential to provide technological recommendation for the fabrication of the medical devices due to the material’s metastable nature. This study aims to investigate the material removal rate (MRR) and surface roughness under different current and pulse-on time of newly developed Ni- and Cu-free Zr-based BMG using sinking-electrical discharge machining (EDM). By using weightloss calculation, surface roughness test and scanning electron microscopy (SEM) observation on the workpiece after machining, both MRR and surface roughness were obtained to be increased up to 0.594 mm3/min and 5.50 μm, respectively, when the higher current was applied. On the other hand, the longer pulse-on time shifted the Ra into the higher value but lower the MRR value to only 0.183 mm3/min at 150 μs. Contrary, the surface hardness value was enhanced by both higher current and pulse-on time applied during machining indicating different level of structural change after high-temperature spark exposure on the BMG surface. These phenomena are strongly related to the surface evaporation which characterize the formation of crater and recast layer in various thicknesses and morphologies as well as the crystallization under the different discharge energy and exposure time.

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Section: Introductionmentioning

confidence: 99%

The Effect of Discharge Current and Pulse-On Time on Biocompatible Zr-based BMG Sinking-EDM

et al. 2020

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“…Nanocrystalline phases of %10 nm in size were also formed of compositions Zr 2 Cu, ZrAl 2 , and Zr 2 Ni. [235] The feed rate of the specimen is another important consideration to avoid devitrification. For Zr 52.5 Ti 5 Cu 17.9 Ni 14.6 Al 10 rods cut in dry conditions without coolant, [236] a higher feed rate of 4000 mm min À1 resulted in specimens that did not crystallize, even though the temperature that was reached during cutting was greater than the glass transition temperature.…”

Section: Machining and Cutting Techniquesmentioning

confidence: 99%

“…Nanocrystalline phases of ≈10 nm in size were also formed of compositions Zr 2 Cu, ZrAl 2 , and Zr 2 Ni. [ 235 ]…”

Section: Manufacturing Approachesmentioning

confidence: 99%

Latest Advances in Manufacturing and Machine Learning of Bulk Metallic Glasses

et al. 2023

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In this review, two interrelated areas are focused on for the development of novel amorphous metallic alloys, namely, materials processing and machine learning techniques for the design of new alloy compositions. Findings, barriers, and opportunities are described, targeting powder production and sintering, additive manufacturing, and postprocessing techniques, followed by the latest developments in artificial intelligence algorithms for both the design of new alloys and for alloy classification tasks.

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“…Several efforts conducted to machine BMG using conventional machining such as turning, milling, and drilling reported that the high cutting force and elevated cutting temperature indicating by the presence of light emission from cutting region were noticed during cutting, thus they induced excessive tool wear and break risking on the cutting eficiency [8], [9]. Moreover, the phase transformation from amorphous to crystalline was also observed on both chip and machined surface caused by high cutting temperature indicating the degradation of the amorphous nature and limit its application [10]. Although these phenomena can be minimized using the lower cutting speed and cutting fluid application, but for cutting Zr54Al17Co29 BMG having low GFA compared with BMG used on previous studies, the crystallization is susceptibly achieved at higher level using conventional machining.…”

Section: Introductionmentioning

confidence: 99%

Measuring the Influence of Process Parameter on CuCr Electrode Tool Wear Rate for Biocompatible Zr-Based BMG Cutting Using Sinking-EDM

Pradana

Fanani

Aminnudin

et al. 2020

KEM

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Subsequent processing through machining for biocompatible Zr-based BMG previously developed is needed in order to enlarge the material application, especially for medical devices. In this study the performance of CuCr tool on EDM process was investigated to cut biocompatible Zr-based BMG having low machinability nature. The experiment utilized volume loss technique to measure the TWR and consecutive SEM observation to reveal the tool wear mechanism of selected tool samples. The tool wear behavior was strongly characterized by the combination of discharge current and pulse-on time, where the larger TWR obtained by higher current and shorter pulse-on time. By SEM analysis, the irregular-shaped surface morphology with the presence of debris was observed on the tool wear region resulted by high discharge energy process. Additionally, the larger crater size, microvoids and numerous debris particles were also appeared on BMG workpiece surface machined using higher discharge energy.

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Electron microscopy of bulk metallic glass machining chips

Cited by 5 publications

References 17 publications

The Effect of Discharge Current and Pulse-On Time on Biocompatible Zr-based BMG Sinking-EDM

The Effect of Discharge Current and Pulse-On Time on Biocompatible Zr-based BMG Sinking-EDM

Latest Advances in Manufacturing and Machine Learning of Bulk Metallic Glasses

Measuring the Influence of Process Parameter on CuCr Electrode Tool Wear Rate for Biocompatible Zr-Based BMG Cutting Using Sinking-EDM

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