Effects of Heat Treatment on Microstructure, Mechanical Properties, Corrosion Resistance and Cytotoxicity of ZM21 Magnesium Alloy as Biomaterials

Journal Article · Tue Jan 15 04:00:00 EST 2019 · Journal of Materials Engineering and Performance

DOI:https://doi.org/10.1007/S11665-018-3781-0· OSTI ID:22971034

Jiang, Dayue; Dai, Yilong; Zhang, Yu; Yan, Yang; Ma, Jiaji ^[1]; Li, Ding ^[2]; Yu, Kun ^[1]

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1. Central South University, School of Materials Science and Engineering (China)
2. The Second Xiangya Hospital of Central South University (China)

The effects of heat treatment on microstructure, mechanical properties, corrosion resistance and cytotoxicity of extruded Mg-2Zn-1Mn (wt.%) alloy were investigated for biomedical application in this study. The extruded alloy was T4 treated at 510 °C for 4 h and T5 treated at 200 °C for 16 h separately. The extruded Mg-Zn-Mn alloy mainly consists of Mg{sub x}Mn{sub y} phases. After T4 treatment, the amount of Mg{sub x}Mn{sub y} phases decreases and average grain size rises from 8 to 24 μm. After T5 treatment, Mg{sub 7}Zn{sub 3} phase newly precipitates along the grain boundaries and the size of grain remains similar. Compared with the T4-treated samples, the extruded and T5-treated samples exhibit higher mechanical properties. The T5-treated samples have an ultimate tensile stress of 273 MPa and an elongation of 19.7%. On the other hand, T4-treated samples present higher corrosion resistance in electrochemical tests. The degradation rates of extruded, T4-treated and T5-treated samples are 0.44 mm/year, 0.48 mm/year and 0.50 mm/year, respectively, in Ringer’s solution at 37 ± 0.2 °C. In addition, T4-treated alloy does not induce toxicity to the L-929 cells in in vitro cytotoxicity test.

• OSTI ID: 22971034
• Journal Information: Journal of Materials Engineering and Performance, Journal Name: Journal of Materials Engineering and Performance Journal Issue: 1 Vol. 28; ISSN 1059-9495; ISSN JMEPEG
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BIOLOGICAL MATERIALS
CORROSION RESISTANCE
ELECTROCHEMISTRY
GRAIN BOUNDARIES
GRAIN SIZE
HEAT TREATMENTS
IN VITRO
MAGNESIUM ALLOYS
MECHANICAL PROPERTIES
TOXICITY