Effect of sterilization temperatures on the mechanical and corrosion properties of ultrafine-grained Zn-0.3Mn alloy
In this study,a biodegradable ultrafine-grained(UFG)Zn-0.3Mn alloy(Original)for med-ical orthopedic implant applications was prepared by severe plastic deformation(casting-hot extrusion-multipass rotary forging).The changes in the microstructure,mechanical properties,and corrosion properties of this alloy under the conditions of low-temperature sterilization(t55),steam sterilization(t120),and dry heat sterilization(t180)were also investigated.Results show that the degree of alloy re-crystallization gradually intensifies at the microstructure level as the sterilization temperature increa-ses.At the same time,the grain size of the main phase and the particle size of the MnZn13 phase en-large.In terms of mechanical properties,the nano hardness and elastic modulus of the alloy will grad-ually increase with the increase of sterilization temperature.The corrosion performance is attributed to the decreases in grain boundary density and MnZn13 phase ratio.These decreases reduce the corrosion initiation point and gradually lower the corrosion rate of the alloy.Accordingly,the sterilization tem-perature will sufficiently affect the microstructure,mechanical properties,and corrosion behavior of the biodegradable UFG Zn-0.3Mn alloy.Therefore,the heating process should be avoided in the steri-lization method of Zn-based implant devices.
万方数据
维普
