Abstract
Magnesium alloys act as ideal biomedical materials with good biocompatibility. In this paper, the extruded biomedical Mg-6Zn-0.5Nd-0.5/0.8Ca alloys were prepared and their microstructure, mechanical properties and corrosion properties were investigated. The results showed that the surfaces of Mg-6Zn-0.5Nd-0.5/0.8Ca alloys extruded at medium temperature were smooth and compact without cracks. The tensile strength and elongation of Mg-6Zn-0.5Nd-0.5/0.8Ca alloys were 222.5 MPa and 20.2%, and 287.2 MPa and 18.4%, respectively. A large number of dislocations were generated in the grains and on grain boundaries after the extrusion. The alloy was immersed in simulating body fluid (SBF) for the weightlessness corrosion, and the corrosion products were analyzed by FTIR, SEM equipped with EDS. It was found that the corrosion rate of Mg-6Zn-0.5Nd-0.5Ca and Mg-6Zn-0.5Nd-0.8Ca alloy were 0.82 and 2.98 mm/a, respectively. Furthermore, the compact layer was formed on the surface of the alloy, which can effectively hinder the permeation of Cl− and significantly improve the corrosion resistance of magnesium alloys.
Highlights
With the development of society and the improvement of living standards, biomaterials have attracted immense attention [1]
The extrusion temperature had a significant effect on the properties of the alloy, such as the
The extrusion temperature had a significant effect on the properties of the alloy, such as the appearance, mechanical properties and corrosion resistance [30]
Summary
With the development of society and the improvement of living standards, biomaterials have attracted immense attention [1]. There are a wide range of applications in clinical applications such as titanium alloys [4], cobalt chromium alloys [5], and stainless steel materials [6] When these metal materials are in service in vivo, they will produce toxic substances due to the degradation and abrasion of body fluids, which will reduce biocompatibility and cause inflammation [7,8]. Compared with titanium alloys and cobalt-chromium alloys and stainless steel materials, magnesium alloys possess many desirable properties in clinical applications such as lower cost, good biocompatibility, nontoxicity, biodegradability and similar elastic modulus to bone tissue. It Itis iswell and have low strength plasticity, which limit their wide application wellknown knownthat that alloying alloyingstrategy strategyisisan aneffective effectivestrategy strategytotoimprove improvethe thecomprehensive comprehensiveproperties propertiesofofmaterials materials[16] Both important role in in alloying, andand they are are essential metal elements.
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