Micro-machinability of bulk metallic glass in ultra-precision cutting

Xiao Chen, Junfeng Xiao, Yan Zhu, Ruiji Tian, Xuewen Shu, Jianfeng Xu*

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

Mirco-machinability of Zr 55 Cu 30 Al 10 Ni 5 bulk metallic glass including surface integrity, cutting force, chip morphology, and tool wear was investigated by means of ultra-precision cutting with a diamond tool and a boron nitride tool. The results showed that the metallic glass only attained the lowest surface roughness of about R a 100 nm and was difficult to cut to achieve a mirror surface due to its viscous flow even using a depth of cut of 0.6 μm. An empirical metal micro-cutting force model was applicable for the bulk metallic glass only under the condition that the undeformed chip thickness was larger than the tool edge radius. The diamond tool showed a better wear resistance but a worse machined surface quality as compared to the PCBN tool. TEM observation and nanoindentation analysis indicated that nanocrystallization of the metallic glass and work softening were detected after the micro-machining. Besides, the generation of shear bands and its effect on the machinability of the bulk metallic glass were disscussed.

Original languageEnglish
Pages (from-to)1-12
Number of pages12
JournalMaterials and Design
Volume136
Early online date21 Sep 2017
DOIs
Publication statusPublished - 15 Dec 2017

Fingerprint

Machinability
Metallic glass
Diamond
Diamonds
Nanocrystallization
Boron nitride
Shear bands
Viscous flow
Nanoindentation
Wear resistance
Surface properties
Machining
Mirrors
Surface roughness
Metals
Wear of materials
Transmission electron microscopy

Keywords

  • Bulk metallic glass
  • Machinability
  • Microstructure
  • Surface roughness
  • Ultra-precision cutting

Cite this

Chen, Xiao ; Xiao, Junfeng ; Zhu, Yan ; Tian, Ruiji ; Shu, Xuewen ; Xu, Jianfeng. / Micro-machinability of bulk metallic glass in ultra-precision cutting. In: Materials and Design. 2017 ; Vol. 136. pp. 1-12.
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abstract = "Mirco-machinability of Zr 55 Cu 30 Al 10 Ni 5 bulk metallic glass including surface integrity, cutting force, chip morphology, and tool wear was investigated by means of ultra-precision cutting with a diamond tool and a boron nitride tool. The results showed that the metallic glass only attained the lowest surface roughness of about R a 100 nm and was difficult to cut to achieve a mirror surface due to its viscous flow even using a depth of cut of 0.6 μm. An empirical metal micro-cutting force model was applicable for the bulk metallic glass only under the condition that the undeformed chip thickness was larger than the tool edge radius. The diamond tool showed a better wear resistance but a worse machined surface quality as compared to the PCBN tool. TEM observation and nanoindentation analysis indicated that nanocrystallization of the metallic glass and work softening were detected after the micro-machining. Besides, the generation of shear bands and its effect on the machinability of the bulk metallic glass were disscussed.",
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Micro-machinability of bulk metallic glass in ultra-precision cutting. / Chen, Xiao; Xiao, Junfeng; Zhu, Yan; Tian, Ruiji; Shu, Xuewen; Xu, Jianfeng.

In: Materials and Design, Vol. 136, 15.12.2017, p. 1-12.

Research output: Contribution to journalArticle

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AU - Tian, Ruiji

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AU - Xu, Jianfeng

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