Influence of the amount of intermetallics on the degradation of Mg-Nd alloys under physiological conditions
Publikation: Beiträge in Zeitschriften › Zeitschriftenaufsätze › Forschung › begutachtet
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in: Acta Biomaterialia, Jahrgang 121, 01.02.2021, S. 695-712.
Publikation: Beiträge in Zeitschriften › Zeitschriftenaufsätze › Forschung › begutachtet
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TY - JOUR
T1 - Influence of the amount of intermetallics on the degradation of Mg-Nd alloys under physiological conditions
AU - Zhang, Yaping
AU - Huang, Yuanding
AU - Feyerabend, Frank
AU - Blawert, Carsten
AU - Gan, Weimin
AU - Maawad, Emad
AU - You, Sihang
AU - Gavras, Sarkis
AU - Scharnagl, Nico
AU - Bode, Julia
AU - Vogt, Carla
AU - Zander, Daniela
AU - Willumeit-Römer, Regine
AU - Kainer, Karl Ulrich
AU - Hort, Norbert
N1 - Publisher Copyright: © 2020 The Authors. Published by Elsevier Ltd on behalf of Acta Materialia Inc. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
PY - 2021/2/1
Y1 - 2021/2/1
N2 - The influence of amount of intermetallics on the degradation of as-extruded Mg-Nd alloys with different contents of Nd was investigated via immersion testing in DMEM+10% FBS under cell culture conditions and subsequent microstructural characterizations. It is found that the presence of intermetallic particles Mg41Nd5 affects the corrosion of Mg-Nd alloys in two conflicting ways. One is their negative role that their existence enhances the micro-galvanic corrosion. Another is their positive role. Their existence favours the formation of a continuous and compact corrosion layer. At the early stage of immersion, their negative role predominated. The degradation rate of Mg-Nd alloys monotonously increases with increasing the amount of intermetallics. Mg-5Nd alloy with maximum amount of intermetallics suffered from the most severe corrosion. With the immersion proceeding (≥7 days), then the positive role of these intermetallic particles Mg41Nd5 could not be neglected. Owing to the interaction between their positive and negative roles, at the later stage of immersion the corrosion rate of Mg-Nd alloys first increases with increasing the content of Nd, then reaches to the maximum at 2 wt. % Nd. With a further increase of Nd content, a decrease in corrosion rate occurs. The main corrosion products on the surfaces of Mg-Nd alloys include carbonates, calcium-phosphate, neodymium oxide and/or neodymium hydroxide. They are amorphous at the early stage of immersion. With the immersion proceeding, they are transformed to crystalline. The existence of undegradable Mg41Nd5 particles in the corrosion layer can enhance the crystallization of such amorphous corrosion products.
AB - The influence of amount of intermetallics on the degradation of as-extruded Mg-Nd alloys with different contents of Nd was investigated via immersion testing in DMEM+10% FBS under cell culture conditions and subsequent microstructural characterizations. It is found that the presence of intermetallic particles Mg41Nd5 affects the corrosion of Mg-Nd alloys in two conflicting ways. One is their negative role that their existence enhances the micro-galvanic corrosion. Another is their positive role. Their existence favours the formation of a continuous and compact corrosion layer. At the early stage of immersion, their negative role predominated. The degradation rate of Mg-Nd alloys monotonously increases with increasing the amount of intermetallics. Mg-5Nd alloy with maximum amount of intermetallics suffered from the most severe corrosion. With the immersion proceeding (≥7 days), then the positive role of these intermetallic particles Mg41Nd5 could not be neglected. Owing to the interaction between their positive and negative roles, at the later stage of immersion the corrosion rate of Mg-Nd alloys first increases with increasing the content of Nd, then reaches to the maximum at 2 wt. % Nd. With a further increase of Nd content, a decrease in corrosion rate occurs. The main corrosion products on the surfaces of Mg-Nd alloys include carbonates, calcium-phosphate, neodymium oxide and/or neodymium hydroxide. They are amorphous at the early stage of immersion. With the immersion proceeding, they are transformed to crystalline. The existence of undegradable Mg41Nd5 particles in the corrosion layer can enhance the crystallization of such amorphous corrosion products.
KW - Degradation
KW - Intermetallic particles
KW - Magnesium-neodymium alloys
KW - Microstructure
KW - Engineering
UR - http://www.scopus.com/inward/record.url?scp=85097754659&partnerID=8YFLogxK
UR - https://www.mendeley.com/catalogue/3f0913d2-472f-3174-a2a6-613897f2a362/
U2 - 10.1016/j.actbio.2020.11.050
DO - 10.1016/j.actbio.2020.11.050
M3 - Journal articles
C2 - 33279710
AN - SCOPUS:85097754659
VL - 121
SP - 695
EP - 712
JO - Acta Biomaterialia
JF - Acta Biomaterialia
SN - 1742-7061
ER -