Abstract
The impact of precompression, thermal treatment and its combination on the deformation behaviour of an extruded Mg–Zn–Ca (ZX10) alloy was studied with respect to a varied average grain size. The Hall–Petch plot was used to highlight the impact in a wide grain size interval. The initial texture of the wrought alloy was characterized by X-ray diffraction. Moreover, the evolution of microstructure and texture was provided by the electron backscatter diffraction (EBSD) technique. The obtained results indicate the strong contribution of deformation-thermal treatment on the resulting deformation behaviour. Particularly, after precompression and heat treatment, higher strengthening effect was observed in the reversed tensile loaded compared to compressed samples without any change in the Hall–Petch slope throughout the grain size interval. Unlike this strengthening effect, a reversed tension–compression yield asymmetry with higher strength values in compression has been obtained.
Highlights
The Mg–Zn–Ca alloys belong to the prospective metallic biomaterials due to their biocompatibility, biodegradability [1,2] and the Young’s modulus of the alloys being close to that of bones [3]
The ZX10 (Mg + 1 wt.% Zn + 0.3 wt.% Ca) alloy was prepared by gravity casting and, prior to extrusion, the machined billets were heat-treated at 400 ◦ C for 20 h in order to maintain a solid solution condition
Heat treatment (HT) at 150 ◦ C for 16 h leads to strengthening and to a slight increase in stress compared to the as-extruded condition within observed grain size interval
Summary
The Mg–Zn–Ca alloys belong to the prospective metallic biomaterials due to their biocompatibility, biodegradability [1,2] and the Young’s modulus of the alloys being close to that of bones [3]. The grain refinement and/or texture weakening achieved by, for example, severe plastic deformation techniques or the twin-roll casting process can lead to a lower yield asymmetry in Mg–Zn–Ca alloys [5,6,7,8]. Another concept for obtaining fine-grained microstructure and improving mechanical properties is using precompression and subsequent isothermal aging. It has been shown in [9] that application of this processing performed at 150 ◦ C or 200 ◦ C on the Mg–Zn–Ca (ZX10) alloy containing around
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