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Microstructure Evolution in Mg-Zn-Zr-Gd Biodegradable Alloy: The Decisive Bridge Between Extrusion Temperature and
Huai Yao1,2, Jiu-Ba Wen1,2, Yi Xiong1,2
1School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang Henan, China.
Frontiers in Chemistry
|April 5, 2018
Summary
Researchers tailored magnesium alloy biodegradability by adjusting extrusion temperatures. The optimal 350°C extrusion resulted in superior anticorrosive properties for potential bone substitution applications.
Area of Science:
- Biomaterials Science
- Materials Engineering
- Corrosion Science
Background:
- Magnesium alloys offer biocompatibility and bone-like mechanical properties, but their biodegradability and reactivity require careful control for biomedical applications.
- Developing magnesium alloys for bone substitution necessitates balancing biodegradability with sufficient corrosion resistance in physiological environments.
Purpose of the Study:
- To develop a magnesium alloy (Mg-2.0Zn-0.5Zr-3.0Gd) with tailored biodegradability and enhanced anticorrosive properties for biomaterial applications.
- To investigate the effect of extrusion temperature on the microstructure and corrosion behavior of the developed magnesium alloy.
Main Methods:
- Hot extrusion of Mg-2.0Zn-0.5Zr-3.0Gd alloy at varying temperatures (330-370°C).
- Microstructural analysis including characterization of dynamically recrystallized (DRXed) grains and second phases ((Mg, Zn)3Gd, Mg2Zn11).
- Immersion and electrochemical corrosion tests in simulated body fluids to evaluate anticorrosive ability.
Main Results:
- Extrusion temperature significantly influenced the microstructure, with peak DRXed grain content observed at 350°C.
- The alloy extruded at 350°C exhibited the best anticorrosive performance due to refined microstructures and passivated surfaces.
- Specific microstructural features like uniform nanosized grains and reduced chemical potentials contributed to improved corrosion resistance.
Conclusions:
- Extrusion temperature is a critical parameter for controlling the microstructure and corrosion resistance of Mg-Zn-Zr-Gd alloys.
- The Mg-2.0Zn-0.5Zr-3.0Gd alloy processed at 350°C demonstrates promising potential as a biodegradable metallic biomaterial for bone applications.
- The findings provide insights into tailoring biometal properties for enhanced performance in physiological environments.
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