Crystallization and carbonization of an electrical discharge machined Zr-based bulk metallic glass alloy
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Sung-Long Chen and Ming-Hong Lin Department of Mechanical Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung 807, Taiwan
Shih-Fu Oua) 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 Department of Mechanical Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung 807, Taiwan
Mao-Suan Huangb) 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 (Received 25 April 2013; accepted 4 September 2013)
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 sP. 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 5 b(IP sP)a.
I. INTRODUCTION
Among the numerous multicomponent metallic glassy alloy systems that have recently been discovered, the most important are those based on Zr,1–4 Mg,5,6 and La.7,8 These metallic glassy alloys make it possible to cast bulk amorphous samples at a cooling rate less than 100 K/s, pointing at the engineering applications of bulk amorphous alloys as structural materials. To extend their applications, the alloy design, property evaluation, and manufacturing process improvements of metallic glassy alloys need to be further developed and studied.
Address all correspondence to these authors. a) e-mail: [email protected] b) e-mail: [email protected] DOI: 10.1557/jmr.2013.329 J. Mater. Res., Vol. 28, No. 22, Nov 28, 2013
The Zr-based bulk metallic glass (BMG) alloy system is one of the more prominent metallic glassy alloys due to their wear resistance, corrosion resistance, fracture toughness, and yield strength.2,9–17 To fulfill the recent demanding, the special needs such as high glass forming ability (GFA) together with a wide supercooled liquid region, some multicomponent alloys based on Zr-based BMG allo
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