Microstructural evolution and mechanical properties of Mg-11Gd-4.5Y-1Nd-1.5Zn-0.5Zr alloy prepared via pre-ageing and hot extrusion

Publikation: Beiträge in ZeitschriftenZeitschriftenaufsätzeForschungbegutachtet

Authors

  • Zijian Yu
  • Yuanding Huang
  • Chamini Lakshi Mendis
  • Norbert Hort
  • Jian Meng

The Mg-11Gd-4.5Y-1Nd-1.5Zn-0.5Zr (wt%) alloy was pre-aged prior to hot extrusion. Pre-ageing treatment introduced uniform distribution of plate-like Mg5RE precipitates, which transformed into nano-scale globular Mg5RE particles by split and spheroidization during hot extrusion. These globular Mg5RE particles contributed to continuous dynamic recrystallization by promoting the evolution of low misorientation sub-grain boundaries to high misorientation grain boundaries and caused grain refinement through grain boundary pinning. The improved mechanical properties were ascribed to the grain refinement, globular Mg5RE and LPSO precipitates. The ratio of compressive to tensile yield strength is 1.2. The yield strength asymmetry was attributed to the deformation asymmetry of LPSO phase and non-isotropic deformation behaviors of Mg matrix in tension and compression.

OriginalspracheEnglisch
ZeitschriftMaterials Science and Engineering A
Jahrgang624
Seiten (von - bis)23-31
Anzahl der Seiten9
ISSN0921-5093
DOIs
PublikationsstatusErschienen - 29.01.2015
Extern publiziertJa

DOI