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

Published online by Cambridge University Press:  09 December 2015

Zhi Hu
Affiliation:
Institute of Advanced Forming, Department of Materials Processing Engineering, Nanchang University, Nanchang 330031, China
Xiao Li
Affiliation:
Institute of Advanced Forming, Department of Materials Processing Engineering, Nanchang University, Nanchang 330031, China
Qun Hua
Affiliation:
Institute of Advanced Forming, Department of Materials Processing Engineering, Nanchang University, Nanchang 330031, China
Hong Yan
Affiliation:
Institute of Advanced Forming, Department of Materials Processing Engineering, Nanchang University, Nanchang 330031, China
Hong Xv Qiu
Affiliation:
Institute of Advanced Forming, Department of Materials Processing Engineering, Nanchang University, Nanchang 330031, China
Xian Ming Ruan
Affiliation:
Institute of Advanced Forming, Department of Materials Processing Engineering, Nanchang University, Nanchang 330031, China
Zheng Hua Li
Affiliation:
Institute of Advanced Forming, Department of Materials Processing Engineering, Nanchang University, Nanchang 330031, China
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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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Copyright © Materials Research Society 2015 

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