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Microstructure, mechanical properties, and biodegradation response of the grain-refined Zn alloys for potential medical materials

Journal Article


Abstract


  • As a new kind of biodegradable metal, Zn possesses promising features, i.e. suitable biodegradability and biocompatibility, lower energy consumption for melting, better recyclability, and processing size tolerance. Such features provide some new insights for manufacturing medical implants. However, cast pure Zn usually contains coarsening microstructures, which brings about poor syngenetic controlling between mechanical strength and degradation rate. In the present work, a significant grain refinement was achieved in the Zn alloys through combination of solidification and rolling, followed by exploration of the mechanical response and in vitro degradation. Specifically, the grain refiner (i.e. Zn–Al master alloy) was firstly prepared and, then, added into cast pure Zn during solidification. Fine equiaxed grains were obtained due to the constitutional supercooling (CS)-driven interdependence effects. Then, the cast Zn alloys were subjected to hot rolling at 200 °C, which gives rise to further reduction in the grain size of Zn alloys. Thereafter, the mechanical properties and the in vitro immersion testing were carried out not only in the as-rolled Zn–Al alloys, but also in the purely cast Zn–Al alloys for comparison. The {0001} basal plane texture became dominant in all the as-rolled Zn–Al alloys; however, the weak {112¯0} prismatic plane texture occurred in the high alloying Zn–Al alloys (>1.5wt% Al). Finally, the mechanisms behind the mechanical improvement and the in vitro degradation were discussed. These work shield new light on synergic tunning between the biodegradable rate and mechanical strength of Zn alloys.

Publication Date


  • 2021

Citation


  • Huang, T., Liu, Z., Wu, D., & Yu, H. (2021). Microstructure, mechanical properties, and biodegradation response of the grain-refined Zn alloys for potential medical materials. Journal of Materials Research and Technology, 15, 226-240. doi:10.1016/j.jmrt.2021.08.024

Scopus Eid


  • 2-s2.0-85113709441

Start Page


  • 226

End Page


  • 240

Volume


  • 15

Abstract


  • As a new kind of biodegradable metal, Zn possesses promising features, i.e. suitable biodegradability and biocompatibility, lower energy consumption for melting, better recyclability, and processing size tolerance. Such features provide some new insights for manufacturing medical implants. However, cast pure Zn usually contains coarsening microstructures, which brings about poor syngenetic controlling between mechanical strength and degradation rate. In the present work, a significant grain refinement was achieved in the Zn alloys through combination of solidification and rolling, followed by exploration of the mechanical response and in vitro degradation. Specifically, the grain refiner (i.e. Zn–Al master alloy) was firstly prepared and, then, added into cast pure Zn during solidification. Fine equiaxed grains were obtained due to the constitutional supercooling (CS)-driven interdependence effects. Then, the cast Zn alloys were subjected to hot rolling at 200 °C, which gives rise to further reduction in the grain size of Zn alloys. Thereafter, the mechanical properties and the in vitro immersion testing were carried out not only in the as-rolled Zn–Al alloys, but also in the purely cast Zn–Al alloys for comparison. The {0001} basal plane texture became dominant in all the as-rolled Zn–Al alloys; however, the weak {112¯0} prismatic plane texture occurred in the high alloying Zn–Al alloys (>1.5wt% Al). Finally, the mechanisms behind the mechanical improvement and the in vitro degradation were discussed. These work shield new light on synergic tunning between the biodegradable rate and mechanical strength of Zn alloys.

Publication Date


  • 2021

Citation


  • Huang, T., Liu, Z., Wu, D., & Yu, H. (2021). Microstructure, mechanical properties, and biodegradation response of the grain-refined Zn alloys for potential medical materials. Journal of Materials Research and Technology, 15, 226-240. doi:10.1016/j.jmrt.2021.08.024

Scopus Eid


  • 2-s2.0-85113709441

Start Page


  • 226

End Page


  • 240

Volume


  • 15