Next Article in Journal
Microstructures and Mechanical Properties of 7Mn Steel Manufactured by Different Rolling Processes
Next Article in Special Issue
Influence of the Composition of the Hank’s Balanced Salt Solution on the Corrosion Behavior of AZ31 and AZ61 Magnesium Alloys
Previous Article in Journal
Prediction of the Geometrical Accuracy of the Machined Surface of the Tool Steel EN X30WCrV9-3 after Electrical Discharge Machining with CuZn37 Wire Electrode
Previous Article in Special Issue
The Prospects of Zinc as a Structural Material for Biodegradable Implants—A Review Paper
Open AccessArticle

Characterization of Powder Metallurgy Processed Pure Magnesium Materials for Biomedical Applications

1
Materials Research Centre, Faculty of Chemistry, Brno University of Technology, Purkyňova 464/118, 61200 Brno, Czech Republic
2
Institute of Materials Science and Engineering, Faculty of Mechanical Engineering, Brno University of Technology, Technická 2896/2, 61669 Brno, Czech Republic
3
Institute of Physics of Materials, Academy of Sciences of the Czech Republic, Žižkova 22, 61662 Brno, Czech Republic
*
Author to whom correspondence should be addressed.
Metals 2017, 7(11), 461; https://doi.org/10.3390/met7110461
Received: 14 September 2017 / Revised: 23 October 2017 / Accepted: 24 October 2017 / Published: 31 October 2017
(This article belongs to the Special Issue Biodegradable Metals)
Magnesium with its mechanical properties and nontoxicity is predetermined as a material for biomedical applications; however, its high reactivity is a limiting factor for its usage. Powder metallurgy is one of the promising methods for the enhancement of material mechanical properties and, due to the introduced plastic deformation, can also have a positive influence on corrosion resistance. Pure magnesium samples were prepared via powder metallurgy. Compacting pressures from 100 MPa to 500 MPa were used for samples’ preparation at room temperature and elevated temperatures. The microstructure of the obtained compacts was analyzed in terms of microscopy. The three-point bendisng test and microhardness testing were adopted to define the compacts’ mechanical properties, discussing the results with respect to fractographic analysis. Electrochemical corrosion properties analyzed with electrochemical impedance spectroscopy carried out in HBSS (Hank’s Balanced Salt Solution) and enriched HBSS were correlated with the metallographic analysis of the corrosion process. Cold compacted materials were very brittle with low strength (up to 50 MPa) and microhardness (up to 50 HV (load: 0.025 kg)) and degraded rapidly in both solutions. Hot pressed materials yielded much higher strength (up to 250 MPa) and microhardness (up to 65 HV (load: 0.025 kg)), and the electrochemical characteristics were significantly better when compared to the cold compacted samples. Temperatures of 300 °C and 400 °C and high compacting pressures from 300 MPa to 500 MPa had a positive influence on material bonding, mechanical and electrochemical properties. A compacting temperature of 500 °C had a detrimental effect on material compaction when using pressure above 200 MPa. View Full-Text
Keywords: magnesium; powder metallurgy; cold pressing; hot pressing; EIS (Electrochemical impedance spectroscopy); three-point bending test; corrosion magnesium; powder metallurgy; cold pressing; hot pressing; EIS (Electrochemical impedance spectroscopy); three-point bending test; corrosion
Show Figures

Figure 1

MDPI and ACS Style

Březina, M.; Minda, J.; Doležal, P.; Krystýnová, M.; Fintová, S.; Zapletal, J.; Wasserbauer, J.; Ptáček, P. Characterization of Powder Metallurgy Processed Pure Magnesium Materials for Biomedical Applications. Metals 2017, 7, 461.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Search more from Scilit
 
Search
Back to TopTop