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Complex microshaping of bulk metallic glass surfaces by electrochemical means

Published online by Cambridge University Press:  25 November 2015

Sylvia Horn ,
Steffen Oswald ,
Mihai Stoica ,
Margitta Uhlemann  and
Annett Gebert
Sylvia Horn
Affiliation:
Leibniz Institute for Solid State and Materials Research IFW Dresden, Institute of Complex Materials, D-01069 Dresden, Germany
Steffen Oswald
Affiliation:
Leibniz Institute for Solid State and Materials Research IFW Dresden, Institute of Complex Materials, D-01069 Dresden, Germany
Mihai Stoica
Affiliation:
Leibniz Institute for Solid State and Materials Research IFW Dresden, Institute of Complex Materials, D-01069 Dresden, Germany
Margitta Uhlemann
Affiliation:
Leibniz Institute for Solid State and Materials Research IFW Dresden, Institute of Complex Materials, D-01069 Dresden, Germany
Annett Gebert*
Affiliation:
Leibniz Institute for Solid State and Materials Research IFW Dresden, Institute of Complex Materials, D-01069 Dresden, Germany
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Electrochemical micromachining (ECMM) with microtool electrodes is a promising method for microshaping bulk metallic glasses (BMGs) at room temperature. A key challenge is the control of the electrode reactions to impede the disturbing passive layer formation on machined surface regions. In the example case of a Fe-based glassy Fe65.5Cr4Mo4Ga4P12C5B5.5 alloy, it will be demonstrated that by using an aqueous electrolyte based on 0.1 M H2SO4 solution with up to 0.1 M Fe2(SO4)3 addition and by applying ultrashort voltage pulses, complex microstructures can be machined with high precision. Potentiodynamic polarization measurements reveal that the salt addition reduces the charge transfer resistance of the microtool and therefore, the negative bias potential effect. The free corrosion and passive state of the BMG workpiece are affected, but not the transpassive regime. Systematic ECMM studies were conducted to obtain optimum parameters for shaping complex lateral structures with very smooth and well-defined machining areas.

Keywords

machiningmicrostructureamorphous
Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 22 , 27 November 2015 , pp. 3493 - 3501
Copyright
Copyright © Materials Research Society 2015 

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