Acta Metallurgica Sinica (English Letters) ›› 2023, Vol. 36 ›› Issue (11): 1833-1843.DOI: 10.1007/s40195-023-01581-0

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Developing Zn-1.5Mg Alloy with Simultaneous Improved Strength, Ductility and Suitable Biodegradability by Rolling at Room Temperature

Ziyue Xu1, Huan Liu1,2(), Guangyang Hu1, Xiaoru Zhuo1, Kai Yan3, Jia Ju4, Wenkai Wang5, Hang Teng2, Jinghua Jiang1, Jing Bai6   

  1. 1College of Mechanics and Materials, Hohai University, Nanjing, 210000, China
    2Jiangsu Key Laboratory for Light Metal Alloys, Nanjing Yunhai Special Metals Co., Ltd., Nanjing, 211200, China
    3College of Mechanical Engineering, Yangzhou University, Yangzhou, 225127, China
    4Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology, Nanjing Institute of Technology, Nanjing, 211167, China
    5School of Transportation Engineering, Nanjing Vocational University of Industry Technology, Nanjing, 210000, China
    6College of Materials Science and Engineering, Southeast University, Nanjing, 211189, China
  • Received:2023-04-03 Revised:2023-05-29 Accepted:2023-05-31 Online:2023-11-10 Published:2023-07-19
  • Contact: Huan Liu, liuhuanseu@hhu.edu.cn

Abstract:

This study systematically investigated the influence of the microstructure evolution, mechanical properties and corrosion behaviors on Zn-1.5Mg (wt%) alloy processed by room-temperature rolling. The as-cast Zn-1.5Mg alloy consists of η-Zn matrix and η-Zn + Mg2Zn11 eutectic structure. As rolling reduction increases, the average grain size of the alloy reduces from 42.9 to 1.7 μm, and the eutectic structure undergoes fragmentation and refinement, changing from a network distribution surrounding the matrix to a lamellar alternating distribution with the matrix. The ultimate tensile strength of the as-rolled alloy (80% reduction) is increased to 366 ± 3.7 MPa, along with a good elongation of 18.4% ± 2.0%. Immersion tests in Hanks’ solution indicate that the initial corrosion rate of the 80%-rolled alloy is 0.030 mm/year and finally stabilizes at 0.034 mm/year when the immersion duration is extended to 21 days. According to X-ray diffractometer and X-ray photoelectron spectroscopy analyses, Ca3(PO4)2, CaCO3, Ca(OH)2, Zn3(PO4)2, Zn(OH)2, ZnO and a small amount of MgO and MgCO3 are the main corrosion products on the surface. Due to the microstructure refinement, the developed alloy exhibits uniform corrosion, and the corrosion morphology is dominated by pitting pits.

Key words: Zn-1.5Mg alloy, Rolling, Microstructure, Mechanical properties, Corrosion behavior