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Effect of operating parameters on the drilling behavior of Zr57.5Cu11.2Ni13.8Al17.5 bulk metallic glass

Published online by Cambridge University Press:  20 November 2013

Naeem ul Haq Tariq ,
Ghulam Muhammad  and
Hasan Bin Awais
Naeem ul Haq Tariq*
Affiliation:
Department of Metallurgy and Materials Engineering, Pakistan Institute of Engineering and Applied Sciences, Nilore, Islamabad, Pakistan
Ghulam Muhammad
Affiliation:
Department of Mechanical Engineering, Pakistan Institute of Engineering and Applied Sciences, Nilore, Islamabad, Pakistan
Hasan Bin Awais
Affiliation:
Department of Metallurgy and Materials Engineering, Pakistan Institute of Engineering and Applied Sciences, Nilore, Islamabad, Pakistan
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Zr-based bulk metallic glasses (BMGs) exhibit superior physical and chemical properties in comparison to their crystalline counterparts. In the present work, drilling behavior of Zr57.5Cu11.2Ni13.8Al17.5 BMG was investigated at various operating conditions. Drilling was performed using high-speed steel (HSS) and carbide bits. Chip morphology, chip light emission, and burr formation at various drilling parameters were studied to achieve a feasible operating condition for drilling hole without light emission, chip clogging, and debris accumulation. Short spiral chip morphology which is considered ideal in the drilling process was observed at relatively low feed rate (1.5 mm/min) and medium spindle speed (1500 rpm). This also resulted in a small amount of molten debris around the entry hole. It was observed that at the same feed rate, the gradual increase in the speed of the HSS drill bit results in more light emission from the machining surface, whereas no light emission was observed in the case of the carbide drill bit at all drilling parameters.

Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 23 , 14 December 2013 , pp. 3288 - 3296
Copyright
Copyright © Materials Research Society 2013 

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