Abstract
Magnesium alloys are attracting more and more attention for producing temporary prosthetic devices thanks to their bioresorbable characteristics in human environment. However, they present a reduced corrosion resistance to body fluids, which still limits their applications to a great extent. In this work, severe plastic deformation through large strain extrusion machining is explored, as a route for the surface and sub-surface modification of the AZ61 magnesium alloy with the aim of improving its corrosion resistance. Different process parameters, namely cooling condition and cutting speed, were adopted and their effects on the machined surface integrity and corrosion resistance were investigated. The obtained results show that cryogenic cooling applied to large strain extrusion machining can represent an efficient strategy to enhance the magnesium alloys poor corrosion behavior, regardless the adopted cutting speed.
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