Impact of Micropeening on Magnetic Shape Memory Alloys

Faculty Mentor Information

Dr. Peter Mullner

Abstract

Micropumps are an integral part of delivering very small doses into a system. The cornerstone of micropumps in this study are magnetic shape memory alloys (MSMAs) which both determine the size of and deliver the microdoses of solution. When using MSMAs in micropumps, the volume of the indentation formed under a local magnetic field controls how much solution is moved from one area to another. The size of the indentation depends on the local strain which results from magnetic-field-induced twinning (shear). To characterize the volume of liquid transferred, the surface profile was characterized while exposed to a local magnetic field. The surface of the MSMA sample was prepared with polishing, electropolishing, and micropeening. The surface roughness was characterized using a Bruker Stylus Profilometer, and the size of the indentations were determined using an in-house created laser measuring system (LMS). By characterizing mircopeening and its impacts on MSMAs, the fabrication of micropumps can be more efficient.

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Impact of Micropeening on Magnetic Shape Memory Alloys

Micropumps are an integral part of delivering very small doses into a system. The cornerstone of micropumps in this study are magnetic shape memory alloys (MSMAs) which both determine the size of and deliver the microdoses of solution. When using MSMAs in micropumps, the volume of the indentation formed under a local magnetic field controls how much solution is moved from one area to another. The size of the indentation depends on the local strain which results from magnetic-field-induced twinning (shear). To characterize the volume of liquid transferred, the surface profile was characterized while exposed to a local magnetic field. The surface of the MSMA sample was prepared with polishing, electropolishing, and micropeening. The surface roughness was characterized using a Bruker Stylus Profilometer, and the size of the indentations were determined using an in-house created laser measuring system (LMS). By characterizing mircopeening and its impacts on MSMAs, the fabrication of micropumps can be more efficient.