TY - JOUR
T1 - Mechanical and Corrosion Properties of AZ31 Mg Alloy Processed by Equal-Channel Angular Pressing and Aging
AU - Shahar, I. A.
AU - Hosaka, T.
AU - Yoshihara, S.
AU - Macdonald, B. J.
N1 - Publisher Copyright:
© 2017 Published by Elsevier Ltd.
PY - 2017
Y1 - 2017
N2 - Magnesium (Mg) has a good biocompatibility and thus a potential candidate for medical implants. However, the major drawback of Mg alloys consists of their fast corrosion rate, especially in the physiological pH 7.4environment thereby losing their mechanical integrity before the tissues have sufficient time to heal. Nevertheless, the use of Mg alloys as biodegradable implants has been promising, however their corrosion resistance should be enhanced. It has been known that equal-channel angular pressing (ECAP) process significantly affects the mechanical properties of Mg alloys but as the tensile strength rises, the corrosion performance deteriorates. Additionally, the secondary phase influences the corrosion resistance of magnesium-aluminum based alloys. The second-phase plays dual roles that depend on the amount and distribution of this phase. Therefore, in this study, we attempted to investigate the effect of grain refinement and second-phase redistribution on corrosion behavior and mechanical properties of AZ31 Mg alloy by changing the condition of ECAP process and subsequent aging. Per the optical microstructure observation, a fine and homogeneous second-phase microstructure appears to be a better anti-corrosion barrier, hence enhances the corrosion resistance of the alloy.
AB - Magnesium (Mg) has a good biocompatibility and thus a potential candidate for medical implants. However, the major drawback of Mg alloys consists of their fast corrosion rate, especially in the physiological pH 7.4environment thereby losing their mechanical integrity before the tissues have sufficient time to heal. Nevertheless, the use of Mg alloys as biodegradable implants has been promising, however their corrosion resistance should be enhanced. It has been known that equal-channel angular pressing (ECAP) process significantly affects the mechanical properties of Mg alloys but as the tensile strength rises, the corrosion performance deteriorates. Additionally, the secondary phase influences the corrosion resistance of magnesium-aluminum based alloys. The second-phase plays dual roles that depend on the amount and distribution of this phase. Therefore, in this study, we attempted to investigate the effect of grain refinement and second-phase redistribution on corrosion behavior and mechanical properties of AZ31 Mg alloy by changing the condition of ECAP process and subsequent aging. Per the optical microstructure observation, a fine and homogeneous second-phase microstructure appears to be a better anti-corrosion barrier, hence enhances the corrosion resistance of the alloy.
KW - AZ31 alloy
KW - Corrosion resistance
KW - ECAP
KW - aging treatment
KW - fine grains
KW - mechanical properties
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U2 - 10.1016/j.proeng.2017.04.113
DO - 10.1016/j.proeng.2017.04.113
M3 - Conference article
AN - SCOPUS:85020029038
VL - 184
SP - 423
EP - 431
JO - Procedia Engineering
JF - Procedia Engineering
SN - 1877-7058
T2 - Advances in Material and Processing Technologies Conference, AMPT 2017
Y2 - 11 December 2017 through 14 December 2017
ER -