Effect of Heat Treatment on Microstructure and Mechanical Properties of Mg-5.5 Zn Alloy

DOI

10.2991/978-94-6463-922-3_29How to use a DOI?

Keywords

Mg Zn alloy; stir casting; Heat Treatment

Abstract

Magnesium and its alloys stand out as potential candidates for degradable implants in biomedical applications due to their high specific strength and appropriate mechanical properties. As an implant material Mg is biocompatible and biodegradable in human body fluid, thus eliminating the need for a second surgery to remove the implant. However pure Magnesium shows loss of strength as it is corroded away in the body fluid. Mg-Zn alloys can contribute to reduced stress shielding and better load transfer, which is essential for the long-term success of orthopedic implants. Besides, Mg-Zn alloy promotes bone growth and osseointegration, the process by which the implant fuses with the surrounding bone. In this investigation, a new Mg-5.5 Zn alloy was developed using stir casting. The fabricated alloy was subjected to solution treatment and aging treatment. The microstructure, porosity and mechanical properties of the as-cast and heat-treated Mg-5.5 Zn alloy for three different solution treatment interval vis 6 h, 8 h and 10 h followed by 5 hours aging treatment were evaluated and compared. Microstructure study had been carried out using Optical microscopy and SEM. The specimen subjected to eight hours solution treatment followed by 5 hours aging exhibited better mechanical properties. For this specimen, about 64.57% 67.67% and 11.55% increase in tensile strength, compressive strength and microhardness respectively were observed. This is due to the decrease in the grain size and increase in the volume fraction of the secondary phase. The enhanced strength and hardness of the Mg–5.5Zn alloy make it an ideal material for temporary load-bearing implants, such as bone screws and plates, where strength comparable to cortical bone is crucial.

Copyright

© 2025 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - A. U. Anooja
AU  - P. A. Abdulsamad
AU  - P. R. Shalij
PY  - 2025
DA  - 2025/12/25
TI  - Effect of Heat Treatment on Microstructure and Mechanical Properties of Mg-5.5 Zn Alloy
BT  - Proceedings of the International Conference Recent Advances in Materials, Processes and Technology for Sustainability (RAMPTS 2025)
PB  - Atlantis Press
SP  - 443
EP  - 458
SN  - 2590-3217
UR  - https://doi.org/10.2991/978-94-6463-922-3_29
DO  - 10.2991/978-94-6463-922-3_29
ID  - Anooja2025
ER  -