Microstructural changes of Zr-based metallic glass during micro-electrical discharge machining and grinding by a sintered diamond tool

Hu Huang, Jiwang Yan

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Micro-electrical discharge machining (micro-EDM) and grinding of Zr-based metallic glass (MG) were performed by using sintered polycrystalline diamond (PCD) as a hybrid tool. The microstructural changes of the workpiece surface layer were investigated. X-ray diffraction (XRD) patterns indicated that the ZrC phase and a few other unknown crystalline phases existed in the surface layer after micro-EDM. After shallow grinding, other new crystalline phases were detected on the surfaces. After deep grinding, however, the crystalline phases disappeared and an amorphous surface was obtained, the XRD and micro-Raman characteristics of which were similar to those of the as-cast MG surface. These results suggested that crystallization of MG in micro-EDM was hierarchical along the depth direction with different mechanisms. The results of surface morphology showed that grinding after micro-EDM not only effectively removed the crystallization layers to obtain an amorphous MG surface, but also improved the surface quality. The hybrid process provides a promising method to create three-dimensional micro features on a MG surface.

Original languageEnglish
Pages (from-to)14-21
Number of pages8
JournalJournal of Alloys and Compounds
Volume688
DOIs
Publication statusPublished - 2016 Dec 15

Fingerprint

Diamond
Electric discharge machining
Metallic glass
Diamonds
Crystallization
Crystalline materials
X ray diffraction
Diffraction patterns
Surface properties
Surface morphology

Keywords

  • Crystallization
  • Grinding
  • Metallic glass
  • Micro-electrical discharge machining
  • Microstructural change
  • Sintered diamond

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Chemistry
  • Metals and Alloys

Cite this

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title = "Microstructural changes of Zr-based metallic glass during micro-electrical discharge machining and grinding by a sintered diamond tool",
abstract = "Micro-electrical discharge machining (micro-EDM) and grinding of Zr-based metallic glass (MG) were performed by using sintered polycrystalline diamond (PCD) as a hybrid tool. The microstructural changes of the workpiece surface layer were investigated. X-ray diffraction (XRD) patterns indicated that the ZrC phase and a few other unknown crystalline phases existed in the surface layer after micro-EDM. After shallow grinding, other new crystalline phases were detected on the surfaces. After deep grinding, however, the crystalline phases disappeared and an amorphous surface was obtained, the XRD and micro-Raman characteristics of which were similar to those of the as-cast MG surface. These results suggested that crystallization of MG in micro-EDM was hierarchical along the depth direction with different mechanisms. The results of surface morphology showed that grinding after micro-EDM not only effectively removed the crystallization layers to obtain an amorphous MG surface, but also improved the surface quality. The hybrid process provides a promising method to create three-dimensional micro features on a MG surface.",
keywords = "Crystallization, Grinding, Metallic glass, Micro-electrical discharge machining, Microstructural change, Sintered diamond",
author = "Hu Huang and Jiwang Yan",
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AU - Huang, Hu

AU - Yan, Jiwang

PY - 2016/12/15

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N2 - Micro-electrical discharge machining (micro-EDM) and grinding of Zr-based metallic glass (MG) were performed by using sintered polycrystalline diamond (PCD) as a hybrid tool. The microstructural changes of the workpiece surface layer were investigated. X-ray diffraction (XRD) patterns indicated that the ZrC phase and a few other unknown crystalline phases existed in the surface layer after micro-EDM. After shallow grinding, other new crystalline phases were detected on the surfaces. After deep grinding, however, the crystalline phases disappeared and an amorphous surface was obtained, the XRD and micro-Raman characteristics of which were similar to those of the as-cast MG surface. These results suggested that crystallization of MG in micro-EDM was hierarchical along the depth direction with different mechanisms. The results of surface morphology showed that grinding after micro-EDM not only effectively removed the crystallization layers to obtain an amorphous MG surface, but also improved the surface quality. The hybrid process provides a promising method to create three-dimensional micro features on a MG surface.

AB - Micro-electrical discharge machining (micro-EDM) and grinding of Zr-based metallic glass (MG) were performed by using sintered polycrystalline diamond (PCD) as a hybrid tool. The microstructural changes of the workpiece surface layer were investigated. X-ray diffraction (XRD) patterns indicated that the ZrC phase and a few other unknown crystalline phases existed in the surface layer after micro-EDM. After shallow grinding, other new crystalline phases were detected on the surfaces. After deep grinding, however, the crystalline phases disappeared and an amorphous surface was obtained, the XRD and micro-Raman characteristics of which were similar to those of the as-cast MG surface. These results suggested that crystallization of MG in micro-EDM was hierarchical along the depth direction with different mechanisms. The results of surface morphology showed that grinding after micro-EDM not only effectively removed the crystallization layers to obtain an amorphous MG surface, but also improved the surface quality. The hybrid process provides a promising method to create three-dimensional micro features on a MG surface.

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KW - Grinding

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