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Using solution heat treatment and multi directional forging to improve the mechanical and corrosion properties of an Mg–2Zn–0.2Ag Alloy

Asadollahi, M ; Sharif University of Technology | 2024

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  1. Type of Document: Article
  2. DOI: 10.1007/s12540-023-01602-8
  3. Publisher: 2024
  4. Abstract:
  5. This study investigated the effects of solution heat treatment and multi-directional forging (MDF) on the microstructure, mechanical, and corrosion properties of an Mg–2Zn–0.2Ag alloy. Microstructural characterization by field emission scanning electron microscopy indicated that the as-cast material consists of some MgZn2 and Ag-rich MgZn precipitates. These silver-rich MgZn precipitates were entirely and partially dissolved after the solution treatment and MDF, respectively. In addition, the grain size of the as-cast alloy increased by 86% and decreased by 43% after solution heat treatment and MDF, respectively. The ultimate shear strength of the as-cast material increased by 25% and reached 149.5 MPa after MDF processing, while it did not change significantly after solution treatment. The obtained results indicated that the corrosion layer formed on the samples consists of an inner layer (magnesium hydroxide) and an outer layer (phosphate compounds). Based on the corrosion tests, it was found that solution heat treatment and MDF could significantly improve the corrosion resistance of the as-cast Mg–2Zn–0.2Ag. The corrosion resistance (Rp) obtained from the electrochemical impedance spectroscopy (EIS) test exhibited enhancements of 119% and 152% after heat treatment and MDF processes, respectively. This improvement in corrosion resistance was attributed to the higher stability of the outer layer in both solution-treated and MDF-processed samples, compared to the as-cast material. The results of cell studies also indicated a significant improvement in the cell viability of the solution-treated Mg–2Zn–0.2Ag alloy sample compared with pure Mg. Graphical Abstract: (Figure presented.) © The Author(s) under exclusive licence to The Korean Institute of Metals and Materials 2024
  6. Keywords:
  7. ACL screws ; Biodegradable materials ; Mechanical properties ; Severe plastic deformation ; Binary alloys ; Biodegradable polymers ; Biodegradation ; Cell culture ; Corrosion resistance ; Corrosion resistant alloys ; Corrosive effects ; Cytotoxicity ; Electrochemical corrosion ; Electrochemical impedance spectroscopy ; Field emission microscopes ; Forging ; Heat resistance ; Heat treatment ; Magnesium compounds ; Scanning electron microscopy ; Silver alloys ; Zinc alloys ; ACL screw ; As-cast ; Biodegradable material ; Cast material ; Mechanical and corrosion properties ; Multidirectional forging ; Outer layer ; Severe plastic deformations ; Solution heat treatment ; Solution treatments ; Magnesium alloys
  8. Source: Metals and Materials International ; Volume 30, Issue 6 , 2024 , Pages 1538-1555 ; 15989623 (ISSN)
  9. URL: https://link.springer.com/article/10.1007/s12540-023-01602-8