Journal Article

PUBDB-2026-01065

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Analysis of twinning mechanisms of Mg–RE alloys using in situ synchrotron radiation diffraction and high-resolution digital image correlation

Garcés, G. (Corresponding author)Extern* ; Laurín, E. ; Orozco-Caballero, A. ; Medina, J.Extern* ; Pérez, P.Extern* ; Stark, A.Extern*Hereon* ; Schell, N.HZG*Hereon* ; Adeva, P.

2026
Elsevier Lausanne

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Please use a persistent id in citations: doi:10.1016/j.jallcom.2026.187583

Abstract: In situ synchrotron diffraction combined with high-resolution digital image correlation (HRDIC) were used toanalyse the activation and spatial propagation of different twinning modes during compression deformation in anextruded Mg-6%Gd(wt%) alloy. Gadolinium atoms are in solid solution in the as-extruded state. Initially, thedeformation process is controlled by the activation of tensile {1012}< 1011 > twinning (TTW). The volumefraction of TTWs evolves rapidly due to the twins transfer throughout neighbour grains and basal slip-assistedtwin nucleation, as evidenced by HRDIC from the early development of localized deformation bands. TTWmode induces the rotation of the lattice with respect to the initial magnesium orientation and, therefore, aprogressive increase in the intensity of the {0002} diffraction peak with increasing the strain in the axial direction,that reaches a maximum at around 6% of compression strain that also coincides with the maximum ofthe work-hardening curve. Above this strain, the compression (CTW) and double twinning (DTW) modes are alsoactivated. This fact reduces the {0002} intensity along AD and increases the intensity of the {0002} diffractionpeak in a direction between 15º to 45º from axial direction. The activation of non-basal dislocation-mediated slipmodes within twins relaxes the localized stress concentration that DTWs generate. Therefore, gadolinium in solidsolution enhances compressive plasticity in Mg alloys through the cooperative interaction between twinning andnon-basal dislocation slip.

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)
2. Helmholtz-Zentrum Hereon (Hereon)

Research Program(s):

1. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)

Experiment(s):

1. PETRA Beamline P07 (PETRA III)

Appears in the scientific report 2026

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Database coverage:
; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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