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Microstructural evolution, mechanical properties, and corrosion resistance of a heat-treated Mg alloy for the bio-medical application

Janbozorgi, M ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.1016/j.jma.2018.11.002
  3. Publisher: National Engg. Reaserch Center for Magnesium Alloys , 2019
  4. Abstract:
  5. During the recent years, some Mg based alloys have extensively been considered as a new generation of degradable and absorbable bio-medical materials. In this work, the Mg–2Zn–1Gd–1Ca (wt%) alloy as a new metallic bio-material was produced by the casting process followed by the heat treatment. The samples of the alloy were solution treated at temperatures of 500, 550, and 600 °C and then quench aged at temperatures of 125, 150, and 175 °C. The results of SEM-EDS examinations indicated that the alloy microstructure consists of α-Mg matrix and the Ca2Mg6Zn3 and Mg3Gd2Zn3 secondary phases. With regard to the results of Vickers hardness test, the temperatures of 500 °C and 150 °C were selected as the optimum solutionizing and aging temperatures, respectively. Moreover, the dissolution of casting precipitates and production of lattice distortion occurring after the solution treatment led to the reduction in ultimate shear strength up to 21%. But, the precipitation hardening and morphological changes taking place during the aging treatment improved the ultimate shear strength up to 32%. Furthermore, the results of electro-chemical and weight-loss measurements in a simulated body fluid indicated that the heat-treated alloy is a promising candidate for the Mg based alloys recently considered for the bio-medical applications. © 2018
  6. Keywords:
  7. Bio-medical applications ; Mg alloys ; Age hardening ; Body fluids ; Calcium alloys ; Corrosion resistance ; Gadolinium alloys ; Heat resistance ; Heat treatment ; Mechanical properties ; Medical applications ; Microstructural evolution ; Ternary alloys ; Vickers hardness ; Vickers hardness testing ; Zinc alloys ; Alloy microstructure ; Biomedical applications ; Lattice distortions ; Mg alloy ; Morphological changes ; Simulated body fluids ; Ultimate shear strength ; Weight loss measurements ; Magnesium alloys
  8. Source: Journal of Magnesium and Alloys ; Volume 7, Issue 1 , 2019 , Pages 80-89 ; 22139567 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/pii/S2213956718300793?via%3Dihub