Microstructure, corrosion resistance and cytocompatibility of Mg-5Y-4Rare Earth-0.5Zr (WE54) alloy

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• 作者：Bohumil Smola^a ; ^{bohumil.smola@mff.cuni.cz} ; Ludě ; k Joska^b ; Ví ; tě ; zslav Bř ; ezina^c ; Ivana Stulí ; ková ; ^a ; Františ ; ek Hnilica^d
• 关键词：WE54 ; Powder metallurgy ; Corrosion ; Extracts in EMEM ; Cell spreading ; Cell mitosis
• 刊名：Materials Science and Engineering ; C
• 出版年：2012
• 期刊代码：63_09284931
• 类别：ms
• 出版时间：1 May, 2012
• 卷：32
• 期：4
• 页码：659-664
• 文件大小：1617 K

摘要

Conventionally cast Mg-5Y-4Rare Earth-0.5Zr alloy (WE54) was solution treated (525 掳C/8 h 鈥?T4) and one part subsequently aged (200 掳C/16 h 鈥?T6). Powder from the cast WE54 alloy prepared by gas atomizing was consolidated by extrusion at 250 掳C or 400 掳C. Dense triangular arrangement of prismatic plates of transient D0₁₉ and C-base centered orthorhombic phases precipitated in the 伪-Mg matrix during the T6 treatment. Both alloys prepared by powder metallurgy exhibit similar microstructure consisting of ~ 4-6 渭m 伪-Mg matrix fibers surrounded by particles of the equilibrium Mg₅(Y, Nd) phase and of oxides. Open circuit potential and polarization resistance in the isotonic saline (9 g/l NaCl/H₂O) were monitored for 24 h. The corrosion rate of the T4 and T6 treated alloys was about 80 times lower than that of commercial Mg. Both alloys prepared by powder metallurgy exhibited approximately 8 times higher corrosion resistance than commercial Mg. The human MG-63 osteoblast-like cells spreading and division in the extracts (0.28 g in 28 ml of EMEM) of all 4 alloys were monitored by cinemicrography for 24 h. The MG-63 cells proliferate without cytotoxicity in all extracts.