Mechanical properties and biodegradability of Mg–Zn–Ca alloys: homogenization heat treatment and hot rolling


İNCESU A. , GÜNGÖR A.

Journal of Materials Science: Materials in Medicine, cilt.31, 2020 (SCI Expanded İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 31 Konu: 12
  • Basım Tarihi: 2020
  • Doi Numarası: 10.1007/s10856-020-06468-5
  • Dergi Adı: Journal of Materials Science: Materials in Medicine

Özet

© 2020, Springer Science+Business Media, LLC, part of Springer Nature.In this study, Mg was alloyed with Zn and Ca to produce six different Mg–Zn–Ca alloys (designated as ZX alloys) by the gravity die casting method. Zn contents of the alloys were 1 wt., 3 wt., and 5 wt.% and Ca contents of the alloys were 0.2 wt. and 1.8 wt.%. Homogenization heat treatment was applied to all cast alloys. After that, a part of each homogenization heat-treated alloys was hot-rolled. Microstructure, mechanical properties, electrochemical and immersion corrosion behaviors at simulated physiological conditions of the heat-treated and hot-rolled alloys were compared. Increasing the amount of alloying elements (Zn and Ca) in Mg reduces grain size and improves the hardness. It was seen that the microstructure consisted of α-Mg as a matrix phase and intermetallic phases: Mg2Ca phase for the alloy having Zn/Ca = 0.37 (ZX12) and Ca2Mg6Zn3 phase for the other alloys. When the mechanical properties and corrosion rates of homogenized and hot-rolled alloys were compared, it was seen that hot-rolled ZX10-h (Mg-0.94Zn-0.16Ca) alloy can be considered as a fracture bone fixation plate material with its acceptable properties: 121 ± 2.1 MPa yield strength, 226 ± 3.7 MPa tensile strength, % 4.1 ± 0.2 elongation, and 0.062 mm/year immersion corrosion rate. [Figure not available: see fulltext.]