Microstructural characterization of an extruded Mg-Ni-Y-RE alloy processed by equal channel angular extrusion Articles uri icon

publication date

  • April 2009

start page

  • 79

end page

  • 86

issue

  • 1-2

volume

  • 473

international standard serial number (ISSN)

  • 0925-8388

electronic international standard serial number (EISSN)

  • 1873-4669

abstract

  • Equal channel angular extrusion (ECAE) was performed in a conventionally extruded Mg-Ni-Y-RE material to develop fine-grained microstructures. The microstructure of the extruded alloy consisted of agglomerated phase particles zones (APZs) aligned along the extrusion direction and phase particles free zones (PFZs) containing recrystallized magnesium grains smaller than 5mum in size. Some PFZs contained a banded unrecrystallized structure. The global texture was very weak and described by a (100) fibre which is common in extruded magnesium alloys. PFZs grain size was reduced to less than 1mum after ECAE deformation at temperatures of 275, 310 and 375C, although some PFZs remained unrecrystallized. The mechanical properties of ECAE deformed materials were correlated with grain size and texture.

keywords

  • magnesium alloys; severe plastic deformation; equal channel angular extrusion; texture