Effect of Sm additions on the microstructure and corrosion behavior of magnesium alloy AZ91

Z. Hu; R. L. Liu; S. K. Kairy; X. Li; H. Yan; N. Birbilis

doi:10.1016/j.corsci.2019.01.024

Effect of Sm additions on the microstructure and corrosion behavior of magnesium alloy AZ91

Z. Hu, R. L. Liu, S. K. Kairy, X. Li, H. Yan, N. Birbilis

Materials Science & Engineering

Research output: Contribution to journal › Article › Research › peer-review

79 Citations (Scopus)

Abstract

Of the alloying additions to magnesium to date, samarium (Sm) has not been widely studied. Herein, the effect of Sm on the microstructure and corrosion of AZ91 (Mg-9Al-1Zn-0.4 Mn in wt.%) were investigated using scanning and transmission electron microscopy, electrochemical measurements, mass loss, and hydrogen collection. Results reveal preferential segregation of Sm with aluminium, leading to the formation of Al ₂ Sm. Formation of Al ₂ Sm in AZ91 resulted in a morphology change of β-Mg ₁₇ Al ₁₂ phase, from a coarse, mesh structure, to a fine short rod structure – reducing the overall β-Mg ₁₇ Al ₁₂ phase area fraction. Microelectrochemical tests were also employed to rationalise the corrosion observed.

Original language	English
Pages (from-to)	144-152
Number of pages	9
Journal	Corrosion Science
Volume	149
DOIs	https://doi.org/10.1016/j.corsci.2019.01.024
Publication status	Published - Apr 2019

Keywords

Alkaline corrosion
Intermetallics
Magnesium
Polarisation
SEM
TEM

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10.1016/j.corsci.2019.01.024

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title = "Effect of Sm additions on the microstructure and corrosion behavior of magnesium alloy AZ91",

abstract = " Of the alloying additions to magnesium to date, samarium (Sm) has not been widely studied. Herein, the effect of Sm on the microstructure and corrosion of AZ91 (Mg-9Al-1Zn-0.4 Mn in wt.%) were investigated using scanning and transmission electron microscopy, electrochemical measurements, mass loss, and hydrogen collection. Results reveal preferential segregation of Sm with aluminium, leading to the formation of Al 2 Sm. Formation of Al 2 Sm in AZ91 resulted in a morphology change of β-Mg 17 Al 12 phase, from a coarse, mesh structure, to a fine short rod structure – reducing the overall β-Mg 17 Al 12 phase area fraction. Microelectrochemical tests were also employed to rationalise the corrosion observed. ",

keywords = "Alkaline corrosion, Intermetallics, Magnesium, Polarisation, SEM, TEM",

author = "Z. Hu and Liu, {R. L.} and Kairy, {S. K.} and X. Li and H. Yan and N. Birbilis",

year = "2019",

month = apr,

doi = "10.1016/j.corsci.2019.01.024",

language = "English",

volume = "149",

pages = "144--152",

journal = "Corrosion Science",

issn = "0010-938X",

publisher = "Elsevier",

}

TY - JOUR

T1 - Effect of Sm additions on the microstructure and corrosion behavior of magnesium alloy AZ91

AU - Hu, Z.

AU - Liu, R. L.

AU - Kairy, S. K.

AU - Li, X.

AU - Yan, H.

AU - Birbilis, N.

PY - 2019/4

Y1 - 2019/4

N2 - Of the alloying additions to magnesium to date, samarium (Sm) has not been widely studied. Herein, the effect of Sm on the microstructure and corrosion of AZ91 (Mg-9Al-1Zn-0.4 Mn in wt.%) were investigated using scanning and transmission electron microscopy, electrochemical measurements, mass loss, and hydrogen collection. Results reveal preferential segregation of Sm with aluminium, leading to the formation of Al 2 Sm. Formation of Al 2 Sm in AZ91 resulted in a morphology change of β-Mg 17 Al 12 phase, from a coarse, mesh structure, to a fine short rod structure – reducing the overall β-Mg 17 Al 12 phase area fraction. Microelectrochemical tests were also employed to rationalise the corrosion observed.

AB - Of the alloying additions to magnesium to date, samarium (Sm) has not been widely studied. Herein, the effect of Sm on the microstructure and corrosion of AZ91 (Mg-9Al-1Zn-0.4 Mn in wt.%) were investigated using scanning and transmission electron microscopy, electrochemical measurements, mass loss, and hydrogen collection. Results reveal preferential segregation of Sm with aluminium, leading to the formation of Al 2 Sm. Formation of Al 2 Sm in AZ91 resulted in a morphology change of β-Mg 17 Al 12 phase, from a coarse, mesh structure, to a fine short rod structure – reducing the overall β-Mg 17 Al 12 phase area fraction. Microelectrochemical tests were also employed to rationalise the corrosion observed.

KW - Alkaline corrosion

KW - Intermetallics

KW - Magnesium

KW - Polarisation

KW - SEM

KW - TEM

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DO - 10.1016/j.corsci.2019.01.024

M3 - Article

AN - SCOPUS:85059958591

SN - 0010-938X

VL - 149

SP - 144

EP - 152

JO - Corrosion Science

JF - Corrosion Science

ER -

Effect of Sm additions on the microstructure and corrosion behavior of magnesium alloy AZ91

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Effect of Sm additions on the microstructure and corrosion behavior of magnesium alloy AZ91

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Keywords

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