Effects of Intermetallic Microstructure on Degradation of Mg-5Nd Alloy
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Effects of Intermetallic Microstructure on Degradation of Mg-5Nd Alloy. / Zhang, Yaping; Huang, Yuanding; Feyerabend, Frank et al.
in: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, Jahrgang 51, Nr. 10, 01.10.2020, S. 5498-5515.Publikation: Beiträge in Zeitschriften › Zeitschriftenaufsätze › Forschung › begutachtet
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TY - JOUR
T1 - Effects of Intermetallic Microstructure on Degradation of Mg-5Nd Alloy
AU - Zhang, Yaping
AU - Huang, Yuanding
AU - Feyerabend, Frank
AU - Gavras, Sarkis
AU - Xu, Yuling
AU - Willumeit-Römer, Regine
AU - Kainer, Karl Ulrich
AU - Hort, Norbert
N1 - Open Access funding provided by Projekt DEAL. The authors acknowledge Mr. G. Meister for preparing the alloys and Ms. Maria Nienaber for measuring the texture. Yaping Zhang also gratefully thanks the China Scholarship Council for the award of a fellowship and funding (No. 201604910708).
PY - 2020/10/1
Y1 - 2020/10/1
N2 - The influence of intermetallic microstructure on the degradation of Mg-5Nd alloy with different heat treatments was investigated via immersion testing in DMEM + 10 pct FBS under cell culture conditions and subsequent microstructural characterizations. It was found that T4 heat-treated sample had the poorest corrosion resistance due to the lack of finely dispersed precipitates inside grains, continuous lamellar particles along grain boundaries and outer Ca-P layer, and to the formation of a loose corrosion product layer. In contrast, the aged samples exhibited a better corrosion resistance due to their presence and to the formation of a compact corrosion layer. Their degradation behavior largely depended on the intermetallic microstructure. Corrosion was initiated in the matrix around stable globular particles Mg41Nd5 at grain boundaries. In the sample aged at high temperature 245 °C, the coexistence of lamellar Mg41Nd5 particles and their nearby Nd-poor regions enhanced the corrosion. The corrosion first started in such regions. It was shown that those finely dispersed precipitates formed during aging had no influence on the corrosion initiation. However, they indeed affected the subsequent corrosion propagation with the immersion proceeding. They supplied barriers for corrosion propagation and hence were beneficial for improving the corrosion resistance. The continuously distributed lamellar Mg41Nd5 precipitates formed at grain boundaries during aging at 245 °C supplied an additional effective obstacle to corrosion propagation. This was especially beneficial for hindering the corrosion propagation at the later stage of corrosion.
AB - The influence of intermetallic microstructure on the degradation of Mg-5Nd alloy with different heat treatments was investigated via immersion testing in DMEM + 10 pct FBS under cell culture conditions and subsequent microstructural characterizations. It was found that T4 heat-treated sample had the poorest corrosion resistance due to the lack of finely dispersed precipitates inside grains, continuous lamellar particles along grain boundaries and outer Ca-P layer, and to the formation of a loose corrosion product layer. In contrast, the aged samples exhibited a better corrosion resistance due to their presence and to the formation of a compact corrosion layer. Their degradation behavior largely depended on the intermetallic microstructure. Corrosion was initiated in the matrix around stable globular particles Mg41Nd5 at grain boundaries. In the sample aged at high temperature 245 °C, the coexistence of lamellar Mg41Nd5 particles and their nearby Nd-poor regions enhanced the corrosion. The corrosion first started in such regions. It was shown that those finely dispersed precipitates formed during aging had no influence on the corrosion initiation. However, they indeed affected the subsequent corrosion propagation with the immersion proceeding. They supplied barriers for corrosion propagation and hence were beneficial for improving the corrosion resistance. The continuously distributed lamellar Mg41Nd5 precipitates formed at grain boundaries during aging at 245 °C supplied an additional effective obstacle to corrosion propagation. This was especially beneficial for hindering the corrosion propagation at the later stage of corrosion.
KW - Engineering
UR - http://www.scopus.com/inward/record.url?scp=85088983306&partnerID=8YFLogxK
U2 - 10.1007/s11661-020-05926-7
DO - 10.1007/s11661-020-05926-7
M3 - Journal articles
AN - SCOPUS:85088983306
VL - 51
SP - 5498
EP - 5515
JO - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
JF - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
SN - 1073-5623
IS - 10
ER -