Microstructure, mechanical and corrosion properties of an as-extruded Mg-Dy-Ni alloy modified by sliding friction treatment

Abstract

Abstract: The effects of the sliding friction treatment (SFT) on the microstructure, mechanical and corrosion properties of as-extruded Mg-12Dy-1.1 Ni (wt.%) alloy were investigated.The results shows that the SFT refined the surface grain size of the as-extruded alloy, the LPSO phase and Mg₂₄Dy₅ granular phase were crushed, and promoting their uniformly distributed. The SFT improved the mechanical and corrosion properties of the extruded alloy. The SFT alloy exhibited the higher maximum tensile strength (UTS=356 MPa) and elongation (ε=25%). The high tensile properties of the SFT alloy mainly originated from grain refinement, the dispersion strengthening of 18R-LPSO phase andphase precipitation strengthening of 14H-LPSO. Additionally,the weight loss rate of the SFT alloy immersed in 0.1 mol NaCl for 1 h decreased from 3.02 mg/cm²/h to 1.86 mg/cm²/h compared with as-extruded alloy. The corrosion current density of the SFT alloy decreased to 2.98 mA/cm². The good corrosion property of the SFT alloy was related to the uniform distribution of alloying elements and the second phase particles.

Key words: as-extruded Mg-Dy-Ni alloy, sliding friction treatment, microstructure, mechanical property, corrosion property

CLC Number:

TG146.2

BI Guang-li , CHEN Si-qi, JIANG Jing, LI Yuan-dong ZHANG Yu-sheng, JIANG Chun-hong. Microstructure, mechanical and corrosion properties of an as-extruded Mg-Dy-Ni alloy modified by sliding friction treatment[J]. Journal of Lanzhou University of Technology, 2021, 47(4): 13-21.

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