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Processing of the Magnesium Alloys by Selective Laser Melting Method
Suchý, Jan ; Hort, Norbert (oponent) ; Warchomicka, Fernando (oponent) ; Paloušek, David (vedoucí práce)
The topic of the presented doctoral thesis is the processing of magnesium alloy technologies of selective laser melting. The thesis elaborates in more detail the issue of corrosion resistance of the material produced in this way, relative density, and mechanical properties with emphasis on the use in biomedical applications. The main goal is to clarify the influence of process and technological parameters on the corrosion rate of the processed material. 4 In the first phase of the work, the relative density of the samples was examined on series of linear and volumetric samples along with the internal microstructure and mechanical properties. The second phase dealt with the influence of microstructure and surface quality on the resulting corrosion rate of the material in the simulated environment of the human body. Thanks to this, it was possible to determine the corrosion rate of the SLM processed material and to determine how it can be changed by setting of the process parameters. During the research, it was repeatedly achieved a relative density of 99.5% with a hardness of 85 ± 6 HV, compressive strength of 416 ± 40 MPa and three-point bending strength of 212 ± 9 MPa, which are the values relatively close to human bones. At the same time, it was possible to reduce the corrosion rate of the material by almost 22% by reducing the surface roughness from the initial Ra 57.3 to Ra 34.2. However, a detailed influence of cathodic phases during the corrosion test was not tested. This thesis provides the reader with a comprehensive overview of 3D printing of magnesium alloys along with a detailed description of the influence of process and technological parameters on the WE43 alloy production process. The thesis defines the corrosion properties of 3D printed material with a relative density of 99.5% with different surface qualities. The results further advance the knowledge in the field of biodegradable implants for medical applications.
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