Abstract
Zinc-based alloys represent one of the most highly developed areas regarding biodegradable materials. Despite this, some general deficiencies such as cytotoxicity and poor mechanical properties (especially elongation), are not properly solved. In this work, a Zn-5Mg (5 wt.% Mg) composite material with tailored mechanical and superior corrosion properties is prepared by powder metallurgy techniques. Pure Zn and Mg are mixed and subsequently compacted by extrusion at 200 °C and an extrusion ratio of 10. The final product possesses appropriate mechanical properties (tensile yield strength = 148 MPa, ultimate tensile strength = 183 MPa, and elongation = 16%) and decreased by four times the release of Zn in the initial stage of degradation compared to pure Zn, which can highly decrease cytotoxicity effects and therefore positively affect the initial stage of the healing process.
Highlights
Binary zinc–magnesium alloys have been studied with regard to the improvement of corrosion protection of steel [1,2,3], and the development of arterial stents [4,5,6,7,8,9,10] and various biodegradable fixation devices [11,12]
Green compacts were extruded at 200 ◦ C and an extrusion velocity of
Zn-5Mg (Figure 1b,c) can be seen to be characterized by a partially recrystallized bimodal containing equiaxed grains equiaxed with grain sizeswith in the range
Summary
Binary zinc–magnesium alloys have been studied with regard to the improvement of corrosion protection of steel [1,2,3], and the development of arterial stents [4,5,6,7,8,9,10] and various biodegradable fixation devices [11,12]. Various Zn-based materials with superior mechanical and corrosion properties have been developed and studied [9,10,13,14] but pure Zn (even in low doses) is relatively toxic to cells [15] compared to Mg. The daily zinc requirement for an adult is estimated to be 15 mg/day [7,16]. Even up to 700 mg/day of Mg can be tolerated [7,16]
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