N. Tahreen

Hot Deformation and Processing Map in an Mg-Zn-Mn-Y Alloy

In recent years Mg-Zn-Y series alloys have drawn significant interest due to their superior mechanical properties. The addition of yttrium to the Mg-Zn alloy leads to the formation of a special phase (Mg12YZn) with a long-period stacking ordered (LPSO) structure, which plays an important strengthening role. The main objective of this study was to identify the deformation mechanisms of LPSO phase in an as-extruded yttrium-containing magnesium alloy. On the other hand, the successful manufacturing of magnesium alloy components requires the optimal hot working parameters. The processing map is an effective tool which can be used to pinpoint the optimal processing regions and the instability regions which should be avoided. Another objective of this study was thus to evaluate the hot deformation behavior of a Mg-Zn-Mn-Y alloy via isothermal compression testing at different temperatures and strain rates. The processing maps were constructed and the optimal hot processing conditions were identified.

Effect of Yttrium Addition on Texture Development in a Cast Mg‐Al‐Y Magnesium Alloy during Compression

Magnesium is increasingly used in the automotive and aerospace industries to reduce vehicle weight and fuel consumption. Alloying with rare-earth (RE) elements is considered as an important tool for magnesium to achieve superior properties via texture randomization. The present study was aimed to identify the inter-relationship among the texture evolution, yttrium content and deformation behavior in a cast Mg-Al-Y alloy in compression. A weak and random texture was present in the Y-containing cast magnesium alloy. Increasing Y content reduced the extent of twinning and enhanced the slip deformation mode. Despite a slight decrease in the yield strength and ultimate compressive strength, increasing Y content by 0.3% and lowering Al content by 2% resulted in a significantly increased fracture strain. The compression deformation led to the formation of \(\{ \bar 12\bar 10\} and \{ 01\bar 10\} \) texture components.