Achieving strength-ductility-biodegradation synergy in a low-alloyed Mg-Sn-Li-Ca alloy via multi-polarization of texture and second phases
Abstract
Wrought Mg-Sn alloys are promising for biomedical applications due to their excellent biocompatibility, biodegradability, low density, and high specific strength. However, the poor corrosion resistance and mechanical performance of conventional wrought Mg-Sn alloys limit their clinical applications in load-bearing components. To address these challenges, an extrusion-shearing (ES) process was applied to a novel low-alloyed Mg-Sn-Li-Ca alloy, tailoring its microstructure and texture for comparison with conventional extrusion (EX). The ES process resulted in a significantly refined and homogeneous microstructure, reducing the average grain size to 4.9 µm, less than half of the EX sample (11.1 µm). Instead of a typical single-pole texture component with <10−0>//extrusion direction (ED) in EX sample, the ES sample showed a multipolar texture consisting of three fiber texture components: C1 (115°, 90°, 0∼60°), C2 (175°, 90°, 0∼60°), and P (150°, 0∼90°, 30°). The ES sample achieved a tensile yield strength of 231.8 MPa and elongation of 14.3%, representing improvements of 10.4% and 24.3% over the EX sample, respectively. Microstructural evolution combined with visco-plastic self-consistent modeling revealed that the C1 component promotes {10–12} twinning in the ES samples. The enhanced strength and ductility of the ES samples stemmed from multi-polarization of texture, second-phase distribution, and more homogeneous grain refinement. Moreover, corrosion behavior in α-minimum essential medium was investigated through immersion and electrochemical tests. Although both EX and ES samples exhibited similar high biocompatibility, the biodegradation rate of the ES samples was only 68.2% of the EX sample under immersion. In the ES sample, the multidirectional second-phase streamlines (i.e., multi-polarization of the second phase) inhibited pitting corrosion; the more corrosion-resistant {1–217} planes are nearer to the sample surface in grains with C1 texture component, replacing the {10–10} planes in the EX samples. These findings provide a viable strategy for advanced biodegradable implants via crystallographic engineering.
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BibTeX
@article{han2026achieving,
title = {{Achieving strength-ductility-biodegradation synergy in a low-alloyed Mg-Sn-Li-Ca alloy via multi-polarization of texture and second phases}},
author = {Dongsheng Han and Zilin Li and Zhangzhi Shi and László S Tóth and Werner Skrotzki and Benoit Beausir and Zhonghua Du and Sen Yang and Fengjian Shi and Amélie Fillon and Hélène Birembaux and Mohammed El Ganaoui and Cai Chen and Luning Wang},
journal = {Journal of Magnesium and Alloys},
year = {2026},
month = oct,
doi = {10.1016/j.jma.2026.102000},
url = {https://hal.science/hal-05542893v1},
note = {CC BY-NC-ND 4.0},
}
RIS
TY - JOUR
TI - Achieving strength-ductility-biodegradation synergy in a low-alloyed Mg-Sn-Li-Ca alloy via multi-polarization of texture and second phases
AU - Dongsheng Han
AU - Zilin Li
AU - Zhangzhi Shi
AU - László S Tóth
AU - Werner Skrotzki
AU - Benoit Beausir
AU - Zhonghua Du
AU - Sen Yang
AU - Fengjian Shi
AU - Amélie Fillon
AU - Hélène Birembaux
AU - Mohammed El Ganaoui
AU - Cai Chen
AU - Luning Wang
PY - 2026
DA - 2026/10/13
JO - Journal of Magnesium and Alloys
DO - 10.1016/j.jma.2026.102000
UR - https://hal.science/hal-05542893v1
AB - Wrought Mg-Sn alloys are promising for biomedical applications due to their excellent biocompatibility, biodegradability, low density, and high specific strength. However, the poor corrosion resistance and mechanical performance of conventional wrought Mg-Sn alloys limit their clinical applications in load-bearing components. To address these challenges, an extrusion-shearing (ES) process was applied to a novel low-alloyed Mg-Sn-Li-Ca alloy, tailoring its microstructure and texture for comparison with conventional extrusion (EX). The ES process resulted in a significantly refined and homogeneous microstructure, reducing the average grain size to 4.9 µm, less than half of the EX sample (11.1 µm). Instead of a typical single-pole texture component with <10−0>//extrusion direction (ED) in EX sample, the ES sample showed a multipolar texture consisting of three fiber texture components: C1 (115°, 90°, 0∼60°), C2 (175°, 90°, 0∼60°), and P (150°, 0∼90°, 30°). The ES sample achieved a tensile yield strength of 231.8 MPa and elongation of 14.3%, representing improvements of 10.4% and 24.3% over the EX sample, respectively. Microstructural evolution combined with visco-plastic self-consistent modeling revealed that the C1 component promotes {10–12} twinning in the ES samples. The enhanced strength and ductility of the ES samples stemmed from multi-polarization of texture, second-phase distribution, and more homogeneous grain refinement. Moreover, corrosion behavior in α-minimum essential medium was investigated through immersion and electrochemical tests. Although both EX and ES samples exhibited similar high biocompatibility, the biodegradation rate of the ES samples was only 68.2% of the EX sample under immersion. In the ES sample, the multidirectional second-phase streamlines (i.e., multi-polarization of the second phase) inhibited pitting corrosion; the more corrosion-resistant {1–217} planes are nearer to the sample surface in grains with C1 texture component, replacing the {10–10} planes in the EX samples. These findings provide a viable strategy for advanced biodegradable implants via crystallographic engineering.
SN - 2213-9567
ER -