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Acta Metall Sin  2017, Vol. 53 Issue (10): 1357-1363    DOI: 10.11900/0412.1961.2017.00300
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Mechanical Properties of Biomedical Ultrafine Grained Mg-3Sn-0.5Mn Alloy Processed by Equal-Channel Angular Pressing
Yu PAN1,2, Diantao ZHANG2, Yuning TAN2, Zhen LI1,2, Yufeng ZHENG1,3, Li LI1,2()
1 Center for Biomedical Materials and Engineering, Harbin Engineering University, Harbin 150001, China
2 Institute of Material Processing and Intelligent Manufacturing, Harbin Engineering University, Harbin 150001, China
3 Center for Biomedical Materials and Tissue Engineering, Academy for Advanced Interdisciplinary, Peking University, Beijing 100871, China
Cite this article: 

Yu PAN, Diantao ZHANG, Yuning TAN, Zhen LI, Yufeng ZHENG, Li LI. Mechanical Properties of Biomedical Ultrafine Grained Mg-3Sn-0.5Mn Alloy Processed by Equal-Channel Angular Pressing. Acta Metall Sin, 2017, 53(10): 1357-1363.

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Abstract  

Mg alloy has attracted researchers' attention as applied for novel biomedical material because of its super corrosion property and well biocompatibility. Ultra-fine grain (UFG) Mg alloy has certain advantages in the development of medical devices because of its good plasticity and corrosion resistance. Equal channel angular pressing (ECAP) was performed on Mg-3Sn-0.5Mn alloy successfully. The microstructure and grain size were observed and measured by OM and TEM. The mechanical property was tested by microhardness and tensile test, the texture oriented was experimented by XRD, and the corrosion property was tested by electrochemical experiment. After 4 passes ECAP at 320 ℃, the average grain size of Mg-3Sn-0.5Mn alloy reached 1.65 μm, and local grain size reached 0.8 μm. The grain refinement was caused by severe plastic deformation and recrystallization. The elongation increased from 22.2% to 58.6%, the tensile strength decreased from 242.8 MPa to 195.6 MPa after 4 passes deformation. The mechanical tests showed an improvement in the elongation after 4 passes, which were about 3 times higher than in the as-extruded sample, whereas the tensile strength decreased slightly. The texture of Mg-3Sn-0.5Mn alloy changed obviously which contributed to the actuating of the slip system. This change of texture contributed to the improvement of fracture elongation and decrease of tensile strength. The mechanical property of Mg-3Sn-0.5Mn alloy after ECAP was affected by the texture orientation and grain strengthening.

Key words:  Mg-3Sn-0.5Mn alloy      biomedical metallic material      equal channel angular pressing      ultra-fine grain      mechanical property     
Received:  18 July 2017     
ZTFLH:  TG146.2  
Fund: Supported by National Natural Science Foundation of China (No.51301049)

URL: 

https://www.ams.org.cn/EN/10.11900/0412.1961.2017.00300     OR     https://www.ams.org.cn/EN/Y2017/V53/I10/1357

Fig.1  Morphology of Mg-3Sn-0.5Mn alloy with different passes before and after equal channel angular pressing (ECAP) (a), schematics of marks of different axis (b) and dimensions of tensile samples (c) (unit: mm)
Fig.2  Microstructures of Mg-3Sn-0.5Mn alloy before and after ECAP
(a) extruded (b) 1 pass (c) 2 passes (d) 4 passes
Fig.3  Grain size distributions of Mg-3Sn-0.5Mn alloy before and after ECAP (d—average diameter)
(a) extruded (b) 1 pass (c) 2 passes (d) 4 passes
Fig.4  TEM image of Mg-3Sn-0.5Mn alloy by 4 passes ECAP
Sample
Average
microhardness
HV
Ultimate tensile
strength / MPa
Elongation%
Extruded 45.62±2.1 242.8±3.7 22.2±1.7
1 pass 56.48±1.9 256.3±4.6 25.1±2.1
4 passes 53.99±1.0 195.6±3.1 58.6±1.9
Table 1  Average microhardness and mechanical properties of Mg-3Sn-0.5Mn alloy before and after ECAP
Fig.5  Tensile curves of Mg-3Sn-0.5Mn alloy before and after ECAP
Fig.6  XRD spectra of Mg-3Sn-0.5Mn alloy before and after ECAP
Fig.7  (0002) pole figures of Mg-3Sn-0.5Mn alloy before and after ECAP
(a) extruded (b) 1 pass (c) 2 passes (d) 4 passes
Fig.8  Polarization curves of Mg-3Sn-0.5Mn alloy immersed in simulated body fluid (SBF) before and after ECAP (E—potential, i—current density)
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