Microstructure, Texture and Mechanical Properties of Mg-Zn-Ce Alloy Extruded at Different Temperatures

Abstract

The microstructure, texture and mechanical properties of Mg-1.5 mass%Zn-0.2 mass%Ce alloys extruded at different extrusion temperatures were investigated. A ''rare earth (RE)'' texture component, which laid at about 20 from h2 1 1 1 10i in an inverse pole figure, appeared in the as-extruded specimen, only when the extrusion temperature was set to 703 K. It is suggested that a high extrusion temperature of around 723 K is essential for the formation of RE texture component. Electron back-scatter diffraction (EBSD) measurements revealed that the RE texture component originated from dynamic recrystallized grains in the band microstructure around the unrecrystallized grains, in contrast to the results of previous studies, in which it originated from shear bands in the unrecrystallized grains. The specimen extruded at 703 K and subsequently annealed showed a lower yield stress and higher ductility than that extruded at 573 K and subsequently annealed, owing to the wider spread of texture originating from the RE texture component in the as-extruded specimen.

Microstructure, Deformation, and Property of Wrought Magnesium Alloys

“…Extrusion experiments on Mg-1.5Zn-0.2Ce (wt pct) alloy at different temperatures, 300 and 430°C, indicated that the texture of this alloy was strongly influenced by the extrusion temperature. [218] Chino and co-workers found [218] that the 10 10 // ED texture component formed at both temperatures and dominated the microstructure. A RE-texture component, with the axes parallel to the ED lying~20 deg away from 2 1 10 towards [0001], formed only when the alloy was extruded at 430°C.…”

“…While they suggested that the use of an extrusion temperature above 430°C was essential for the formation of the RE-texture component, this suggestion will no doubt be affected by the extrusion ratio which was not provided in that study. [218] The possibility for fast extrusion has been explored recently of alloys based on the Mg-Zn-Ca-Mn and Mg-Zn-RE systems. [219,220] The total content of the added alloying elements is generally low in order to reduce the flow stress of the alloy during hot extrusion and to increase the solidus temperature of the alloy to avoid hot cracking.…”

The microstructure, texture and mechanical properties of extruded Mg–5.3Zn–0.2Ca–0.5Ce (wt%) alloy

“…The formation of non-basal texture in RE containing Mg alloys was dependent on the extrusion conditions [32]. The RE texture component in Mg-Zn-Ce alloy were inhibited when extruded at lower temperature (300 1C) [34], which was considered to be due to the fact that the non-basal slip cannot be activated at lower extrusion temperature. However, Stanford and Barnett found that the 〈11-21〉 RE texture was absent in Mg-Gd binary alloy when the alloy was extruded at higher temperatures [32].…”

Enhancing the Strength and Ductility in Mg–Zn–Ce Alloy through Achieving High Density Precipitates and Texture Weakening

“…[19] More addition of Zn atoms in Mg-Zn-Ce alloy was reported to enhance strength due to the solution strengthening. The majority of previous investigations on Mg-Zn-Ce alloys were dedicated to texture modification and plasticity improvement at expense of strength reduction.…”

“…Bright field images of the a) as-extruded and b) peak-aged alloy taken with beam paralleled to[11][12][13][14][15][16][17][18][19][20] Mg direction.…”