Research of the microstructure, mechanical property and corrosion behaviours of Mg–Y–Zn–Mn(–Mo) alloy with solution treatment

ABSTRACT

To develop a biomedical magnesium alloy with desirable mechanical properties and corrosion resistance, Mg–6Zn–8.16Y–2.02Mn and Mg–6Zn–8.16Y–2.02Mn–0.3Mo alloy were prepared. Then the alloys were solution-treated at 500°C for 40 h and cooled in the furnace. The results showed that partly 18R-long-period stacking ordered (LPSO) phase transformed to 14H-LPSO phase during solid-solution treatment. The hollowed-out W phase vanished and spherical W phase was formed. And the volume fraction of 18R-LPSO and the average size of the spherical W phase particles were reduced. Corrosion behaviour of the alloy in Hank’s solution under each condition was studied by immersion test and electrochemical test. The solution-treated Mg–6Zn–8.16Y–2.02Mn–0.3Mo alloy exhibited the best mechanical property (ultimate tensile strength, UTS 270 MPa and elongation, EL 23%) and corrosion resistance (P_W 1.03 mm/year and I_corr 0.20 mm/year) due to fine and homogeneous microstructure.

KEYWORDS:

• Magnesium
• LPSO
• solution treatment
• microstructure
• mechanical property
• corrosion

Acknowledgements

This research was supported by the National Natural Science Foundation of China (Nos. 51474153 and 51574175).

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by National Natural Science Foundation of China [grant number 51474153], [grant number 51574175].