Effect of Rolling Temperature on the Mechanical Properties and Corrosion Behavior of Mg-Zn-Y-Nd Alloy Thin Sheets

doi:10.1007/s40195-024-01740-x

Abstract

Abstract:

There is a growing demand for degradable membranes with sufficient mechanical properties to guide tissue regeneration in dental surgery. In the present work, a two-stage rolling process in which the first rolling stage (FRS) adopted a reduction rate of 30% for six passes at various temperatures, while the second rolling stage was rolling at 200 °C for two passes, was employed to prepare a 150 μm-grade Mg-2.0Zn-0.5Y-0.5Nd (ZE21B) Mg alloy sheets for guided tissue regeneration membrane. The microstructure of the thin sheets was gradually refined with increasing rolling passes, and the thin sheets that were rolled at different FRS temperatures exhibit an ellipse texture. The thin sheets rolled at 350 °C for FRS show low elongation due to premature fracture caused by the coarse second phase particles. On account of uniform and fine grains, the thin sheets rolled at 400 °C for the FRS have proper mechanical properties: yield strength of 214.6 ± 8.5 MPa, ultimate tensile strength (UTS) of 246.8 ± 10.3 MPa and elongation to failure of 28.3 ± 1.2%. When rolling at 450 °C for FRS, proper ductility of the thin sheets has been acquired, followed by a decline in UTS since a bimodal structure with fine and coarse grain was developed. Immersion tests demonstrated the FRS temperature had no significant effect on the corrosion behavior and corrosion rate of Mg alloy sheets after 7 days’ immersion in artificial saliva solution. This research has great significance for the production of degradable Mg sheets for guided tissue regeneration membrane.

Key words: Mg alloy thin sheets, Two-stage rolling, Guided tissue regeneration membrane, Artificial saliva, Corrosion behavior

Zhibin Liu, Guangya Zhu, Wenkai Li, Di Mei, Peihua Du, Yufeng Sun, Shijie Zhu, Shaokang Guan. Effect of Rolling Temperature on the Mechanical Properties and Corrosion Behavior of Mg-Zn-Y-Nd Alloy Thin Sheets[J]. Acta Metallurgica Sinica (English Letters), 2024, 37(10): 1721-1734.

Figures/Tables 17

Table 1 Chemical composition of ZE21B alloy (wt%)

Mg	Zn	Y	Nd	Ni	Fe	Cu	Be	Si
Bal.	2.04	0.44	0.51	0.0013	0.0021	0.0003	0.0001	0.009

Fig. 1 Microstructures of as-cast and as-homogenized ZE21B alloy: a, b OM; c, d, f SEM. a, c as-cast; b, d, e as-homogenized

Fig. 2 Schematic diagram of the two-stage rolling process

Fig. 3 Detailed size of specimens for tensile test (mm)

Table 2 Chemical composition of the artificial saliva (g·L−1)

MgCl₂·6H₂O	CaCl₂·2H₂O	K₂HPO₄·3H₂O	K₂CO₃	NaCl	KCl
0.17	0.15	0.76	0.53	0.33	0.75

Fig. 4 OM results on ND-RD planes of ZE21B sheets: a, d R350; b, e R400; c, f R450; a, b, c unannealed; d, e, f annealed

Fig. 5 SEM results on TD-RD planes of annealed ZE21B thin sheets: a1-a3 R350; b1-b3 R400; c1-c3 R450. a1, b1, c1 mark I; a2, b2, c2 mark II; a3, b3, c3 mark III

Fig. 6 XRD patterns of as-rolled ZE21B alloy

Fig. 7 Texture evolution displaying by EBSD and XRD: a-i the micro-texture evolution on the TD-RD plane of ZE21B sheets. a R350-I; b R350-II; c R350-III; d R400-I; e R400-II; f R400-III; g R450-I; h R450-II; i R450-III. j-o Macro-texture transition from j, k, l unannealed to m, n, o annealed after final rolling pass; j, m R350; k, n R400; l, o R450

Fig. 8 Tensile curves of ZE21B thin sheets

Table 3 Mechanical properties details of ZE21B thin sheets

Sample	Yield strength, YS (MPa)	Ultimate tensile strength, UTS (MPa)	Elongation, EL (%)
R350	189.5 ± 1.5	240.3 ± 0.8	21.5 ± 0.2
R400	214.6 ± 8.5	246.8 ± 10.3	28.3 ± 1.2
R450	202.6 ± 8.6	235.2 ± 6.6	24.8 ± 1.9

Fig. 9 SEM images of fracture surfaces after tensile tests at room temperature: a1-a3 R350; b1-b3 R400; c1-c3 R450

Fig. 10 Result of the average corrosion rate after immersion in artificial saliva immersion in for 1, 3, 5, 7 days

Fig. 11 Corrosion product morphologies of ZE21B alloy immersed in artificial saliva for 7 days: a R350, b R400, c R450. a1, b1, c1 1 d; a2, b2, c2 3 d; a3, b3, c3 5 d; a4, b4, c4 7 d

Fig. 12 EDS results of corrosion products (marked in Fig. 11) after immersion in artificial saliva for 7 day

Fig. 13 XRD patterns on the corrosion products formed on ZE21B alloy after 7 days’ immersion in artificial saliva

Fig. 14 Schematic diagram of microstructure and corrosion morphology of the ZE21B sheets in artificial saliva solution: a R350; b R400; c R450; d corrosion mechanism

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