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Crystallization and carbonization of an electrical discharge machined Zr-based bulk metallic glass alloy

Published online by Cambridge University Press:  11 November 2013

Shy-Feng Hsieh ,
Sung-Long Chen ,
Ming-Hong Lin ,
Shih-Fu Ou ,
Wei-Ting Lin  and
Mao-Suan Huang
Shy-Feng Hsieh*
Affiliation:
Department of Mold and Die Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung 807, Taiwan; and Research Center for Biomedical Devices and Prototyping Production, Taipei Medical University, Taipei 110, Taiwan
Sung-Long Chen
Affiliation:
Department of Mechanical Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung 807, Taiwan
Ming-Hong Lin
Affiliation:
Department of Mechanical Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung 807, Taiwan
Shih-Fu Ou*
Affiliation:
Department of Mold and Die Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung 807, Taiwan; and Research Center for Biomedical Devices and Prototyping Production, Taipei Medical University, Taipei 110, Taiwan
Wei-Ting Lin
Affiliation:
Department of Mechanical Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung 807, Taiwan
Mao-Suan Huang*
Affiliation:
Research Center for Biomedical Devices and Prototyping Production, Taipei Medical University, Taipei 110, Taiwan; School of Oral Hygiene, College of Oral Medicine, Taipei Medical University, Taipei, Taiwan; and Department of Dentistry, Taipei Medical University-Shuang Ho Hospital, Taipei 235, Taiwan
*
a)Address all correspondence to these authors. e-mail: [email protected]
b)e-mail: [email protected]
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Abstract

This study investigated the microstructure and machining characteristics of a Zr38.5Ti16.5Cu15.25Ni9.75Be20 bulk metallic glass (Zr-BMG) alloy machined using electro-discharge machining (EDM). After EDM, the hardening effect near the outer surface of the electro-discharge machined (EDMed) Zr-BMG alloy originated from the surface carbides of the recast layer, ZrC and TiC. The thickness of the recast layer, crater size, and the surface roughness increased with greater pulse energy. Furthermore, the EDM can generate a porous recast layer and convert the Zr-BMG alloy surface into a carbide surface, which is a potential method to fabricate biomaterials. Experimental results also show that the material removal rate of this alloy in the EDM process was significantly related to the pulse current IP and pulse duration τP. Many electro-discharge craters and recast materials were observed on the surface of the EDMed Zr-BMG alloy. The surface roughness of the EDMed Zr-BMG alloy was found to obey the empirical equation of Ra = β(IP × τP)α.

Keywords

Zrmicrostructure
Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 22 , 28 November 2013 , pp. 3177 - 3184
Copyright
Copyright © Materials Research Society 2013 

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