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Effects of Sm on microstructure and corrosion resistance of hot-extruded AZ61 magnesium alloys

  • Zhi Hu (a1), Xiao Li (a1), Qun Hua (a1), Hong Yan (a1), Hong Xv Qiu (a1), Xian Ming Ruan (a1) and Zheng Hua Li (a1)...

Abstract

In this study, the effects of Sm on the microstructure and corrosion resistance of hot-extruded AZ61 magnesium alloys were investigated by optical microscopy, scanning electron microscopy, and transmission electron microscopy. The results showed that uniformly dispersed Al2Sm particles with size of ∼2 μm were discovered in the hot-extruded AZ61 magnesium alloy sample modified with 1.0 wt% Sm, which promoted dynamic recrystallization grain growth during the hot-extruded process, gradually increasing the grain of the alloy as Sm content increased. The morphology of the corroded surface and the corrosion rate of the hot-extruded AZ61 magnesium alloy both were significantly improved after Sm addition. The alloy sample modified with 2.0 wt% Sm after immersion in 3.5 wt% NaCl solution for 12 h showed minimum corrosion rate value, 3.1 mg/cm2 day, which is only 3.7% of the corrosion rate of unmodified alloy (82 mg/cm2 day).

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a) Address all correspondence to this author. e-mail: huzhi215@163.com

References

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Keywords

Effects of Sm on microstructure and corrosion resistance of hot-extruded AZ61 magnesium alloys

  • Zhi Hu (a1), Xiao Li (a1), Qun Hua (a1), Hong Yan (a1), Hong Xv Qiu (a1), Xian Ming Ruan (a1) and Zheng Hua Li (a1)...

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