Microstructure, mechanical and biodegradable properties of a Mg–2Zn–1Gd–0.5Zr alloy with different solution treatments

• Published in: Rare metals 2019-06, Vol.38 (6), p.532-542
• Main Authors: Chen, Jun-Xiu, Gao, Ming, Tan, Li-Li, Yang, Ke
• Format: Article
• Language: English
• Subjects: Alloys; Bend tests; Biodegradability; Biomaterials; Chemistry and Materials Science; Corrosion; Corrosion rate; Corrosion resistance; Corrosion resistant alloys; Energy; Extrusion; Galvanic corrosion; Immersion tests (corrosion); Magnesium base alloys; Materials Engineering; Materials Science; Maximum bending; Mechanical properties; Metallic Materials; Microstructure; Nanoscale Science and Technology; Physical Chemistry; Solution heat treatment; Tensile tests
• ISSN: 1001-0521; 1867-7185
• DOI: 10.1007/s12598-019-01213-6

Solution treatment is a useful way to improve the degradation resistance of Mg alloys. In this work, effects of solution treatment temperature on mechanical and biodegradable properties of an extruded Mg–2Zn–1Gd–0.5Zr alloy were studied. Microstructure analysis, tensile test, three-point bending test, immersion test and electrochemical test were performed. The results showed that increasing solution temperature decreases the mechanical properties of the alloy. However, three-point bending test revealed that the solution-treated alloy at 510 °C could maintain 95% of its maximum bending force ( F max ) during the 28-day immersion period. After treatment at 510 °C for 5 h, all the second phases were dissolved into the alloy, the galvanic corrosion was inhibited, and the alloy exhibited good corrosion resistance with a corrosion rate of 0.35 mm·year −1 in Hank’s solution.