The role of Zr-rich cores in strength differential effect in an extruded Mg–Zn–Zr alloy

Microstructural evolution during the annealing of an extruded AZ31 magnesium alloy

“…Extrusion involves deformation similar to uni-axial loading such that the basal planes, which contain the < 1 12 0 > Burgers vectors of the dislocations mainly activated, are rotated to be parallel to the main deformation axis (ED). The formation of this texture type has been observed in round extruded magnesium alloys [10,17,21] as well as in other hexagonal metals, e.g. Ti [23], Zr [24] and Be [25].…”

“…In RE-free Mg alloys various textures can be formed depending on the extrusion parameters. Although a fibre-type texture in which the < 1 01 0 > directions of the crystallites align parallel to the ED is mostly observed in extruded rods, the < 1120 > fibre and the < 1010 > -< 1120 > double fibre texture parallel to the ED are also often observed [10,15,[17][18][19][20]. Nevertheless, it is widely unknown which mechanisms are responsible for these texture variations and their relation with the microstructure.…”

Microstructure and mechanical properties of Mg–6Zn–xCu–0.6Zr (wt.%) alloys

“…Among the commercial Mg alloys available, Mg-Zn based alloys are of particular interest due to their pronounced age-hardening effects [2][3][4][5]. However, the predominant strengthening ␤ 1 precipitates are widely reported to exhibit a coarse and inhomogeneous distribution within the matrix of the binary Mg-Zn alloy [2][3][4][5]. Effective control of the size and distribution of these precipitates is therefore crucial to ultimately produce Mg-Zn alloys with excellent mechanical properties.…”

“…In this research, a new quaternary alloy of Mg-Zn-Cu-Zr is reported. The addition of Zirconium (Zr), as the fourth alloying element, is to refine the gain sizes [5] and to improve corrosion resistance of the alloys [6]. The present paper is aimed at the effects of Cu concentration on the age-hardening response and mechanical properties of the Mg-Zn-Cu-Zr alloys, so as to optimize the Cu addition and to develop a leaner, low cost high performance Mg alloy.…”

Corrosion resistance of Mg–5Al–xSr alloys

“…However, MgO can crack easily and Mg(OH) 2 can roll up due to residual stress [32,33]. Therefore, the composition and structure of the oxide/hydroxide film are often reinforced by adding an active metal [34][35][36][37][38], such as aluminum [39], or a heavy metal (such as iron and nickel) [40][41][42][43][44][45][46][47][48][49][50]. However, precipitates, such as heavy metal-magnesium compounds, act as local cathodes during corrosion [51], which has prompted the development of low heavy metal content alloys.…”