J. Mater. Sci. Technol. ›› 2019, Vol. 35 ›› Issue (1): 6-18.DOI: 10.1016/j.jmst.2018.09.020
• Orginal Article • Previous Articles Next Articles
Yiyuan Kangab, Beining Dua, Yueming Lia, Baojie Wangc, Liyuan Shenga,*(), Longquan Shaob,*(), Yufeng Zhenga, Tingfei Xia
Received:
2018-03-19
Revised:
2018-05-09
Accepted:
2018-05-29
Online:
2019-01-04
Published:
2019-01-15
Yiyuan Kang, Beining Du, Yueming Li, Baojie Wang, Liyuan Sheng, Longquan Shao, Yufeng Zheng, Tingfei Xi. Optimizing mechanical property and cytocompatibility of the biodegradable Mg-Zn-Y-Nd alloy by hot extrusion and heat treatment[J]. J. Mater. Sci. Technol., 2019, 35(1): 6-18.
Fig. 3. SEM, TEM and EDS results of the secondary phase in the alloys: (a) SEM image of the eutectic W-phase in alloy C; (b) SEM image of the large block coexisting W-phase and I-phase in alloy C; (c) SEM image of the W-phase and I-phase in alloy E; (d) W-phase and I-phase in alloy EH; (e) EDS results of the W-phase; (f) EDS results of the I-phase; (g) SEM image of the grain boundary continuous W′-phase in alloy C; (h) Bright-field image and SADPs of the grain boundary continuous W′-phase.
Fig. 5. SEM observation on fracture surface and longitudinal section of the tensile fractured specimens: (a) Fracture surface of alloy C; (b) Longitudinal section of the fractured alloy C; (c) Fracture surface of alloy E; (d), (e) Longitudinal section of the fractured alloy E; (f) Fracture surface of alloy EH; (g), (h) Longitudinal section of the fractured alloy EH. (A represent the first crack that initiate at the broken secondary phases, and B represent the second crack that initiate in the elongated grains.).
Fig. 7. Immersion test results of the Mg-Zn-Y-Nd alloys with different states: (a) Corrosion rate vs Immersion time; (b) variation of pH value of the DMEM after immersion for different time.
Fig. 8. SEM morphology of the Mg-Zn-Y-Nd alloys with different states after immersion for different time: (a)?(d) Alloy C; (e)?(h) Alloy E; (i)?(l) Alloy EH; (a), (e), (i) immersion for 3?h; (b), (f), (j) immersion for 12?h; (c), (g), (k) immersion for 3 d; (d), (h), (l) Immersion for 14 d.
Fig. 9. Viability of HUVECs cultured in 10%, 50%, and 100% extract mediums of the Mg-Zn-Y-Nd alloys with different states for different times and its pH value: (a) 24?h, (b) 48?h, (c) 72?h, (d) the pH values of 100% extracts of alloy C, E, EH and culture media.
Fig. 10. (a) Viability of HUVECs cultured directly on the Mg-Zn-Y-Nd alloys with different states for 1, 3, and 5 d; (b) variation of pH values of the cell culture supernatants after culture on the Mg-Zn-Y-Nd alloys with different states for 24 and 72?h.
Fig. 11. Ion concentration in 100% extracts of the Mg-Zn-Y-Nd alloys with different states according to ICP-MS test: (a) Mg2+; (b) Zn2+; (c) Y3+; (d) Nd3+.
Fig. 12. Ion concentration in cell culture supernatant of the Mg-Zn-Y-Nd alloys with different states according to ICP-MS test: (a)Mg2+; (b)Zn2+; (c)Y3+; (d)Nd3+.
Fig. 13. Morphologies of HUVECs cultured in extracts of the Mg-Zn-Y-Nd alloys with different states for 24?h: (a)?(d) HUVECs cultured in 0 (a), 10% (b), 50% (c), 100% (d) extracts of alloy C; (e)?(h) HUVECs cultured in0 (e), 10% (f), 50% (g), 100% (h) extracts of alloy E; (i)?(l) HUVECs cultured in 0 (i), 10% (j), 50% (k), 100% (l) extracts of alloy EH.
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