• Mingler, B.
• Kilian, H.
• Pogatscher, Stefan
• Hofstetter, J.
• Löffler, J. F.
• Povoden-Karadeniz, E.
• Uggowitzer, Peter J.
• Baumgartner, I.
• Rüedi, S.

Abstract

<p>Deformation dilatometry and semi-industrial extrusion were used to investigate the effect of different thermomechanical processing routes on the microstructure and mechanical properties of the low-alloy Mg alloys ZX10 (Mg-1Zn-0.3Ca) and ZX00 (Mg-0.5Zn-0.15Ca). It is shown that the deliberately adjusted formation of intermetallic particles beneficially influences dynamic recrystallization and grain growth, with the result of a fine-grained microstructure (grain size &lt; 2 μm). The presence of unrecrystallized regions with its unfavorable influence on ductility and mechanical anisotropy can be controlled by the selection of an indirect extrusion mode. Meta-dynamic recrystallization generates almost fully recrystallized microstructures and hence the desired properties, which are characterized by high strength (yield strength ≈ 240 MPa), simultaneously high ductility (elongation to fracture ≈ 30%), and low structural and mechanical anisotropy. These properties are of great interest for light-weight applications and for deployment as biodegradable implants in medical technology.</p>

Topics

• impedance spectroscopy
• grain
• grain size
• extrusion
• strength
• yield strength
• intermetallic
• ductility
• recrystallization
• grain growth
• dilatometry