On the wire EDM of metastable atomic structured bulk metallic glasses

Chang, Weijie; Li, Xiangxiang; Yang, Haidong; Zhang, Junsheng; Zhang, Juchen; Tang, Huohong; Chen, Shun Hua

doi:10.1007/s00170-022-09068-5

Cited by 11 publications

(6 citation statements)

References 32 publications

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“…The discharge energy of a single pulse is the main parameter determining the size of the discharge craters, which affects the material removal rate ( MRR ) [ 27 , 36 ]. The discharge energy of a single pulse can be determined by the discharge voltage, current, and the pulse-on time, as described by the equation [ 28 ]:

where W o is the discharge energy of a single pulse, u(t) is the instantaneous discharge voltage, i(t) is the instantaneous discharge current, and t i is the continuous discharge time. It can be seen that the discharge energy W o increased with the increase of u(t) , i(t) , and t i .…”

Section: Resultsmentioning

confidence: 99%

“…[ 32 ], the BCC2 phase is enriched with Zr and Nb elements with a relatively lower melting point, while the BCC1 phase is enriched with the W and Ta elements with a higher melting point. Differing from the significant carbonization effect of the BMGs during the WEDM [ 28 ], the BCC1 phase with high melting point elements (W and Ta) was not affected by sparking. While the BCC2 phase with Zr and Nb in the Zr1.0 RHEA disappeared.…”

Section: Resultsmentioning

confidence: 99%

“…As a well-known non-traditional machining technology with non-contact force [ 22 , 23 ], wire electrical discharge machining (WEDM) has been widely employed to process difficult-to-cut materials, including bulk metallic glasses (BMGs), ceramics, and carbides [ 24 , 25 , 26 , 27 , 28 ]. For example, Chang et al [ 28 ] studied the effects of WEDM processing parameters on the surface roughness and cutting efficiency of BMGs, where a good surface quality was achieved at a higher cutting efficiency, based on the optimization of the processing parameters. The mechanisms for the change of the parent elements during the sparking were discussed, and the findings have validated the feasibility of processing the BMGs using the WEDM technique.…”

Section: Introductionmentioning

confidence: 99%

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On the WEDM of WNbMoTaZrx (x = 0.5, 1) Refractory High Entropy Alloys

Chen

Chang

et al. 2022

Entropy

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As a potential candidate for the next generation of high-temperature alloys, refractory high entropy alloys (RHEAs) have excellent mechanical properties and thermal stability, especially for high-temperature applications, where the processing of RHEAs plays a critical role in engineering applications. In this work, the wire electrical discharge machining (WEDM) performance of WNbMoTaZrx (x = 0.5, 1) RHEAs was investigated, as compared with tungsten, cemented carbide and industrial pure Zr. The cutting efficiency (CE) of the five materials was significantly dependent on the melting points, while the surface roughness (Ra) was not. For the RHEAs, the CE was significantly affected by the pulse-on time (ON), pulse-off time (OFF) and peak current (IP), while the surface roughness was mainly dependent on the ON and IP. The statistical analyses have shown that the CE data of RHEAs have relatively-smaller Weibull moduli than those for the Ra data, which suggests that the CE of RHEAs can be tuned by optimizing the processing parameters. However, it is challenging to tune the surface roughness of RHEAs by tailoring the processing parameters. Differing from the comparative materials, the WEDMed surfaces of the RHEAs showed dense spherical re-solidified particles at upper recast layers, resulting in larger Ra values. The proportion of the upper recast layers can be estimated by the specific discharge energy (SDE). Following the WEDM, the RHEAs maintained the main BCC1 phase, enriched with the W and Ta elements, while the second BCC2 phase in the Zr1.0 RHEA disappeared. Strategies for achieving a better WEDMed surface quality of RHEAs were also proposed and discussed.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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On the WEDM of WNbMoTaZrx (x = 0.5, 1) Refractory High Entropy Alloys

Chen

Chang

et al. 2022

Entropy

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“…A lower frequency was served by the packet pulse, which was attributed to the lower values of CE. On the other hand, higher energy per unit time was generated during the rectangular pulse, which resulted The performance of wire EDM in machining Zr-based BMG was assessed by Chang et al [108] They further compared the wire EDM machinability of BMG with that of heattreated BMGs (HBMGs) and industry-grade pure zirconium [108]. Molybdenum wire was used as the tool electrode during wire EDM, whereas a mixture of water and base oil (water: oil = 19:1) was considered as the dielectric medium.…”

Section: Liu Et Al (2019a)mentioning

confidence: 99%

Multi-Scale Traditional and Non-Traditional Machining of Bulk Metallic Glasses (BMGs)—Review of Challenges, Recent Advances, and Future Directions

Jahan,

Niraula,

Nafi

et al. 2024

Micromachines

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Bulk metallic glasses (BMGs) are growing in popularity prominently due to their potential in micro-electromechanical systems (MEMSs) and aerospace applications. BMGs have unique mechanical properties, i.e., high strength, hardness, modulus of elasticity, and wear resistance, due to their disordered atomic structure. Due to their unique mechanical properties and amorphous structures, machining of BMGs remains a challenge. This paper aims to carry out a detailed literature review on various aspects of the machining of bulk metallic glasses using both conventional and non-conventional processes, including experimental approaches, modeling, statistical findings, challenges, and guidelines for machining this difficult-to-machine material. Conventional machining processes were found to be challenging for machining bulk metallic glasses due to their high hardness, brittleness, and tendency to convert their amorphous structure into a crystalline structure, especially at the machined surface and sub-surface. Although their high electrical conductivity makes them suitable for machining by non-conventional processes, they impose new challenges such as heat-affected zones and crystallization. Therefore, the successful machining of BMGs requires more in-depth analysis of cutting forces, tool wear, burr formation, surface finish, recast layers or heat-affected zones, crystallization, and mechanical property changes among different varieties of BMGs. This review paper provides guidelines emerging from in-depth analysis of previous studies, as well as offering directions for future research in the machining of BMGs.

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“…Bulk metallic glass material (BMG) exhibits excellent properties such as high strength, high hardness, and good corrosion resistance [1][2][3][4] . Compared to conventional crystalline materials, BMG exhibits excellent mechanical properties such as high strength, high hardness, large elastic limit, high corrosion resistance and high wear resistance [5][6][7] .…”

Section: Introductionmentioning

confidence: 99%

Effects of processing parameters on the surface roughness of Zr-based bulk metallic glass processed by Wire Electrical Discharge Machining

Tang¹,

Cheng²,

Chang³

et al. 2022

Preprint

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Bulk metallic glass (BMG) is one of the predominant materials that are progressively used in the aerospace, medical devices, electronics, sporting goods and engineering materials. Examples include springs, miniature gears, high-end cell phones, slatted track covers, baseball clubs and computer shields. Making of components by BMG is still confrontation. Conventional methods of machining are restricted in use due to more tool wear and slower processing efficiency. Non-traditional methods of machining have been widely used for processing hard materials. Wire Electrical Discharge Machining (WEDM) is one among the promising approach of machining for hard and conductive materials, especially for the new BMG metal material. The preliminary aim of this exploration is to predict the temperature field distribution using the modified Gaussian heat source mode during WEDM multi-pulse discharge process. The impact of various variables like pulse off time and peak current over the pit depth and surface roughness is investigated. Taguchi's orthogonal arrays are espoused to analyze the influence of these parameters and to determine the better machining performance.

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On the wire EDM of metastable atomic structured bulk metallic glasses

Cited by 11 publications

References 32 publications

On the WEDM of WNbMoTaZrx (x = 0.5, 1) Refractory High Entropy Alloys

On the WEDM of WNbMoTaZrx (x = 0.5, 1) Refractory High Entropy Alloys

Multi-Scale Traditional and Non-Traditional Machining of Bulk Metallic Glasses (BMGs)—Review of Challenges, Recent Advances, and Future Directions

Effects of processing parameters on the surface roughness of Zr-based bulk metallic glass processed by Wire Electrical Discharge Machining

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