Investigating the Microstructure, Crystallographic Texture and Mechanical Behavior of Hot-Rolled Pure Mg and Mg-2Al-1Zn-1Ca Alloy

In this study, the microstructure, crystallographic texture and the mechanical performance of hot-rolled pure Mg and Mg-2Al-1Zn-1Ca (herein inferred as AZX211) were thoroughly investigated. The results showed that the designed AZX211 alloy exhibited an exceptional strength/ductility synergy where an...

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Bibliographic Details
Published in:Crystals (Basel) 2022-10, Vol.12 (10), p.1330
Main Authors: Chaudry, Umer Masood, Hamad, Kotiba, Jun, Tea-Sung
Format: Article
Language:English
Subjects:
Alloys
Aluminum
AZ alloys
Crystal structure
Crystallography
Deformation
Ductility
EBSD
Grain boundaries
Grain growth
Grain refinement
Grain size
Homogenization
Hot rolling
Magnesium
Magnesium alloys
Magnesium base alloys
Materials research
Mechanical properties
Methods
Microstructure
Precipitates
Production processes
Roll forming (Metalwork)
Rolling (Metalwork)
Scanning electron microscopy
Shear strain
Shear stress
Spectrum analysis
Structure
Texture
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Summary:In this study, the microstructure, crystallographic texture and the mechanical performance of hot-rolled pure Mg and Mg-2Al-1Zn-1Ca (herein inferred as AZX211) were thoroughly investigated. The results showed that the designed AZX211 alloy exhibited an exceptional strength/ductility synergy where an almost 40% increase in ductility was received for AZX211. The microstructural characterization revealed the grain refinement in the AZX211, where the grain size was reduced by more than 50% (24.5 µm, 10 µm for the pure Mg and the AZX211, respectively). Moreover, a discernible number of precipitates were dispersed in the AZX211, which were confirmed to be (Mg, Al)2Ca. The pure Mg showed a conventional strong basal texture while a significantly weakened split basal texture was received for the AZX211. The fraction of basal-oriented grains was 21% for the pure Mg and 5% for the AZX211. The significant texture weakening for the AZX211 can be attributed to the precipitation and co-segregation that triggered the preferential evolution of the non-basal grains while impeding the growth of the basal grains. This was also confirmed by the crystal orientation and the pseudo-rocking curves. The higher ductility of the AZX211 was explained based on the texture softening and Schmid factor for the basal and non-basal slip systems.
ISSN:2073-4352
2073-4352
DOI:10.3390/cryst12101330