Journal Article

PUBDB-2026-03416

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Twinning during dynamic strain aging in binary Mg-3%Y alloy

Garces, G. (Corresponding author)Extern* ; Máthis, K.Extern* ; Pérez, P. ; Medina, J.Extern* ; Tolnai, D.Extern* ; Gupta, K.Extern* ; Stark, A.Extern* ; Schell, N.Hereon* ; Adeva, P.

2026
Elsevier Lausanne

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Please use a persistent id in citations: doi:10.1016/j.jallcom.2026.189192  doi:10.3204/PUBDB-2026-03416

Abstract: The extruded Mg–3 wt% Y alloy exhibits serrated flow during compression tests along the extrusion direction at intermediate temperatures (150–250 ºC) and a wide range of strain rate (10−2 to 3 ×10−5 s−1) due to dynamic strain aging (DSA). The values of the m + β constant and the activation energy were 2 and 100 kJmol−1, respectively. To elucidate the underlying deformation mechanisms, in-situ synchrotron radiation diffraction and acoustic emission (AE) experiments were conducted at 200 °C. The deformation process involves the activation of <a> -dislocation slip on both basal and non-basal planes, as well as extension twinning, all occurring concurrently with DSA. The characteristic serrations arise from the dynamic interaction between diffusing yttrium atoms and mobile dislocations and twin boundaries. Yttrium atoms are shown to effectively pin <a> -dislocations and inhibit twin boundary propagation, thereby influencing the overall mechanical response during deformation. The unpinning of twin boundaries from yttrium atoms induces a new additional cluster in the acoustic emission signal.

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Contributing Institute(s):

1. DOOR-User (DOOR)
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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