1. Effects of Sr addition on microstructure, mechanical properties and in vitro degradation behavior of as-extruded Zn−Sr binary alloys
- Author
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Guangyin Yuan, Gui-zhou Ke, Hui Zeng, Hua Huang, Rui Yue, and Bin Kang
- Subjects
010302 applied physics ,Materials science ,Alloy ,Metals and Alloys ,02 engineering and technology ,engineering.material ,021001 nanoscience & nanotechnology ,Geotechnical Engineering and Engineering Geology ,Condensed Matter Physics ,Microstructure ,01 natural sciences ,Corrosion ,Galvanic corrosion ,Phase (matter) ,0103 physical sciences ,Ultimate tensile strength ,Materials Chemistry ,engineering ,Composite material ,Elongation ,0210 nano-technology ,Stress concentration - Abstract
The microstructures, mechanical properties and in vitro degradation behavior of as-extruded pure Zn and Zn−xSr (x=0.1, 0.4, 0.8 wt.%) alloys were investigated systematically. For the microstructure and mechanical properties, SrZn13 phase was newly formed due to the addition of 0.1 wt.% Sr, improving the yield strength, ultimate tensile strength and elongation from (85.33±2.86) MPa, (106.00±1.41) MPa and (15.37±0.57)% for pure Zn to (107.67±2.05) MPa, (115.67±2.52) MPa and (20.80±2.19)% for Zn−0.1Sr, respectively. However, further increase of Sr content led to the deterioration of the mechanical properties due to the stress concentration and cracks initiation caused by the coarsening SrZn13 particles during tensile tests. For in vitro degradation, since micro galvanic corrosion was enhanced owing to the formation of the inhomogeneously distributed SrZn13 phase, the corrosion mode became non-uniform. Corrosion rate is gradually increased with the addition of Sr, which is increased from (11.45±2.02) μm/a (a=year) for pure Zn to (32.59±3.40) μm/a for Zn−0.8Sr. To sum up, the as-extruded Zn−0.1Sr alloy exhibited the best combination of mechanical properties and degradation behavior.
- Published
- 2020