No abstract

Rolling experiments were carried out on a ternary Mg-Zn-Ca alloy and its modification with zirconium. Short time annealing of as-rolled sheets is used to reveal the microstructure and texture development. The texture of the as-rolled sheets can be characterised by basal pole figures with split peak towards the rolling direction (RD) and a broad transverse angular spread of basal planes towards the transverse direction (TD). During annealing the RD split peaks as well as orientations in the sheet plane vanish whereas the distribution of orientations tilted towards the TD remains. It is shown in EBSD measurements that during rolling bands of twin containing structures form. During subsequent annealing basal orientations close to the sheet plane vanish based on a grain nucleation and growth mechanism of recrystallisation. Orientations with tilt towards the TD remain in grains that do not undergo such a mechanism. The addition of Zr delays texture weakening.

The paper addresses the relationship between microstructure, texture, and mechanical properties of rolled magnesium sheets. The effect of rolling temperature and alloying elements on texture development and mechanical properties is demonstrated. Special focus is paid to the potential of rare earth elements to modify the anisotropic behavior and to weaken the strong basal texture of magnesium sheets. Alloy design that considers these possibilities together with appropriate selection of process parameters show the road to magnesium sheets with improved forming properties. intRoduCtionThe use of sheet material as a semifi nished product enables a wide scope for design. The development of new materials such as magnesium alloys for lightweight application requires the development of semi-fi nished products for an expansion of possible applications. Magnesium sheet offers a signifi cant possibility of producing components in a large variety of shapes from its simple fl at structure. However, despite their great potential wrought magnesium alloys have hitherto only played a small role in lightweight structural applications. A major technical reason is the fact that commercial magnesium sheets like AZ31 are limited in their ductility and formability, especially at room temperature. This is related to the occurrence of magnesium with a hexagonalclose-packed lattice structure. In consequence, there are a small number of deformation mechanisms that can be activated during plastic deformation at room temperature compared to metals with cubic lattice structures. Basal slip and so-called tensile twinning are

No abstract

Magnesium and its alloys are currently considered to be a promising metallic biomaterial. The interest in magnesium alloys arises from their biocompatibility, bioabsorbility, and especially from their mechanical properties, which are more compatible to those of human bone than the mechanical properties of other metallic biomaterials, such as stainless steel and titanium. A medical application in which magnesium is gaining interest is regenerative medicine where scaffolds are used to create tissues from cells. For its application in regenerative medicine, the scaffolds have to present a 3D open-cell structure. The main purpose of the present research is to set up the fabrication procedure necessary to manufacture porous magnesium scaffolds; for this the replication (infiltration) process has been used and adapted to process magnesium alloys, processing five different biodegradable magnesium alloys (AZ91E, WE43, ZM20, ZWM200, and ZXM200).