Modification of Microstructure and Texture in Highly Non-Flammable Mg-Al-Zn-Y-Ca Alloy Sheets by Controlled Thermomechanical Processes

Abstract

The influence of rolling temperature and pass reduction degree on microstructure and texture evolution was investigated using an AZXW3100 alloy, Mg-3Al-1Zn-0.5Ca-0.5Y, in wt.%. The change in the rolling schedule had a significant influence on the resulting texture and microstructure from the rolling and subsequent annealing. A relatively strong basal-type texture with a basal pole split into the rolling direction was formed by rolling at 450 °C with a decreasing scheme of the pass reduction degrees with a rolling step, while the tilted basal poles in the transverse direction were developed by using an increasing scheme of the pass reduction degrees. Rolling at 500 °C results in a further distinct texture type with a far more largely tilted basal pole into the rolling direction. The directional anisotropy of the mechanical properties in the annealed sheets was caused by the texture and microstructural features, which were in turn influenced by the rolling condition. The Erichsen index of the sheets varied in accordance to the texture sharpness, i.e., the weaker the texture the higher the formability. The sheet with a tetrarchy distribution of the basal poles into the transverse and rolling directions shows an excellent formability with an average Erichsen index of 8.1.

Applications of High-Pressure Die-Casting (HPDC) Magnesium Alloys in Industry

“…Several studies were conducted to improve the flammability resistance of magnesium alloys, mainly through alloying elements such as Al [10,11], Be [128,129], Ca [12][13][14][15][16][17][18][19] and REs [130][131][132][133][134]. The addition of Ca and REs are two of the most effective ways of strengthening the magnesium flammability resistance.…”

“…The development in increasing thermal conductivity of magnesium alloys has supported battery-related applications [7]. On the other hand, flammability resistance has been a hot topic for magnesium alloys, and the related research has gained substantial progress which is highly valuable for aerospace applications [10][11][12][13][14][15][16][17][18][19]. Attributed to the above advantages, magnesium alloys have become one of the lightest and most popular structural metals utilized extensively in the automotive industry.…”

Material and Process Design for Lightweight Structures

“…The fifth contribution by S. Yi and co-workers from Helmholtz-Zentrum Geesthacht and Korea Institute of Materials Science is concerned with aspects of texture and microstructure control of a new non-flammable Mg-Al-Zn-Y-Ca (AZXW3100) magnesium sheet alloy, with the main goal of enhancing the ductility and formability at ambient temperatures [5]. The authors conducted a systematic investigation of the effect of the rolling temperature and imposed deformation per pass on weakening the basal texture and refining the microstructure during subsequent annealing treatments.…”