Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 771, Issue -, Pages 629-635Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2018.08.313
Keywords
Magnesium alloys; LPSO phase; Dislocations; Plastic deformation; X-ray diffraction
Categories
Funding
- Ministry of Human Capacities of Hungary within the ELTE University Excellence program [1783-3/2018/FEKUTSRAT]
- Czech Grant Agency [16-12075S]
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The density and type of dislocations were studied in a plastically deformed long-period stacking ordered (LPSO) phase of a Mg89Y7Zn4 (at.%) alloy. The volume fraction of the LPSO phase was as high as similar to 85%. The plastic deformation was carried out by uniaxial compression up to the strain of similar to 25% in both as-cast and extruded states. The order of magnitude of the dislocation density was similar to 10(14) m(-2) after compression to the strain of similar to 25% for both as-cast and extruded materials. It was also found that most of the dislocations formed in the LPSO phase during extrusion and compression were of 'a'-type. The as-cast sample did not exhibit a strong crystallographic texture, but extrusion caused a texture in which the normal vector of the basal plane was perpendicular to the extrusion axis. The texture developed during extrusion yielded an anisotropic evolution of the dislocation density during subsequent compression. Namely, the density of dislocations developed during compression was lower when the deformation was carried out parallel to the extrusion axis. (c) 2018 Elsevier B.V. All rights reserved.
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