中國有色金屬學(xué)報(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 35 No. 6 June 2025 |
（1. College of Materials Science and Engineering, Shanxi Key Laboratory of Magnesium Matrix Materials, Taiyuan University of Technology, Taiyuan 030024, China;
2. College of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China;
3. Shanxi Jianghuai Heavy Industry Co., Ltd., Jincheng 048000, China;
4. School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China;
5. Magnesium Technology Innovation Center, School of Materials Science and Engineering, Seoul National University, Gwanak-ro, Gwanak-gu, Seoul 08826, Korea）
Abstract:To investigate the effect of microstructure evolution on corrosion behavior and strengthening mechanism of Mg-1Zn-1Ca (wt.%) alloys, as-cast Mg-1Zn-1Ca alloys were performed by equal channel angular pressing (ECAP) with 1 and 4 passes. The corrosion behavior and mechanical properties of alloys were investigated by optical microscopy (OM), scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), electrochemical tests, immersion tests and tensile tests. The results showed that mechanical properties improved after ECAP 1 pass; however, the corrosion resistance deteriorated due to high-density dislocations and fragmented secondary phases by ECAP. In contrast, synchronous improvement in the mechanical properties and corrosion resistance was achieved though grain refinement after ECAP 4 passes; fine grains led to a significant improvement in the yield strength, ultimate tensile strength, elongation, and corrosion rate of 103 MPa, 223 MPa, 30.5%, and 1.5843 mm/a, respectively. The enhanced corrosion resistance was attributed to the formation of dense corrosion product films by finer grains and the barrier effect by high-density grain boundaries. These results indicated that Mg-1Zn-1Ca alloy has a promising potential for application in biomedical materials.
Key words: Mg-1Zn-1Ca alloy; equal channel angular pressing; grain refinement; corrosion behavior; mechanical properties
