Texture evolution and fracture behavior of friction-stir-welded non-flammable Mg–Al–Ca alloy extrusions

Friction stir welding (FSW) was used to successfully join nonflammable Mg85Al10Ca5 (at%) alloy extrusion plates having a high volume fraction of the C36 intermetallic compound. Electron backscatter diffraction (EBSD) combined with digital image correlation allowed us to investigate the texture evolu...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2021-01, Vol.799, p.140090, Article 140090
Main Authors: Inoue, Shin-ichi, Yamasaki, Michiaki, Ohata, Mitsuru, Kakiuchi, Shigeki, Kawamura, Yoshihito, Terasaki, Hidenori
Format: Article
Language:English
Subjects:
Aluminum
Digital imaging
Electron backscatter diffraction
Evolution
Extrusion
Flammability
Friction stir welding
Intermetallic compounds
Intragranular misorientation axis analysis
Lattice rotation
Magnesium alloy
Magnesium base alloys
Misalignment
Texture
Welded joints
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Summary:Friction stir welding (FSW) was used to successfully join nonflammable Mg85Al10Ca5 (at%) alloy extrusion plates having a high volume fraction of the C36 intermetallic compound. Electron backscatter diffraction (EBSD) combined with digital image correlation allowed us to investigate the texture evolution and tensile behavior of the friction-stir-welded region of the alloy. EBSD results revealed that the friction-stir-welded region could be subdivided into the following three textured zones: a typical nugget-shaped stir zone (SZ), a stir-affected zone (SAZ) in the peripheral region of the SZ, and a torsion-affected zone (TAZ) above the SZ. An analysis of the intragranular misorientation axis (IGMA) suggested that the texture evolution of the SZ and SAZ was due to the simultaneous activation of basal and prismatic slips. Furthermore, the strong basal texture in the TAZ appeared to originate from the activation of pyramidal slip by torsion originating from the rotation of the shoulder of the FSW tool. The friction-stir-welded joint exhibited a lower strength than the base material and finally fractured along the paths through which the rim of the probe of the FSW tool had passed. These results clearly indicate that the fracture behavior of the friction-stir-welded Mg alloy was dominated by geometric softening in the SAZ. [Display omitted] •Non-flammable Mg–Al–Ca alloys with high volume fractions of the C36 intermetallic compound were successfully joined by FSW.•Friction-stir-welded region could be subdivided into the four characteristic zones.•Friction-stir-welded joint showed lower strength than that of the base alloys and fractured at the rim of stir zone.•Fracture behavior of the friction-stir-welded Mg–Al–Ca alloys was dominated by geometric softening in stir-affected zone.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2020.140090