Journal Article

FZJ-2026-02933

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Influence of chemical composition on the room temperature plasticity of C15 Ca-Al-Mg Laves phases

Freund, M. (Corresponding author) ; Xie, Z. (Corresponding author) ; Sun, P.-L. ; Berners, L. ; Spille, J.FZJ* ; Wang, H. ; Thomas, C.FZJ* ; Feuerbacher, M.FZJ* ; Lipinska-Chwalek, M.FZJ* ; Mayer, J.FZJ* ; Korte-Kerzel, S.

2024
Elsevier Science Amsterdam [u.a.]

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Please use a persistent id in citations: doi:10.1016/j.actamat.2024.120124  doi:10.34734/FZJ-2026-02933

Abstract: The influence of chemical composition changes on the room temperature mechanical properties in the binary Ca33Al67 C15 CaAl2 Laves phase were investigated in two ternary alloys with off-stoichiometric compositions with 5.7 at.% Mg substitution (Ca33Al61Mg6) and 10.8 at.% Mg and 3.0 at.% Ca substitution (Ca36Al53Mg11) and compared to the stoichiometric (Ca33Al67) composition. Cubic Ca-Al-Mg Laves phases with multiple crystallographic orientations were characterised and deformed using nanoindentation. The hardness and indentation modulus were measured to be 4.1 ± 0.3 GPa and 71.3 ± 1.5 GPa for Ca36Al53Mg11, 4.6 ± 0.2 GPa and 80.4 ± 3.8 GPa for Ca33Al61Mg6 and 4.9 ± 0.3 GPa and 85.5 ± 4.0 GPa for Ca33Al67, taken from our previous study, respectively. The resulting surface traces as well as slip and crack planes, were distinguished on the indentation surfaces, revealing the activation of several different {11n} slip systems, as further confirmed by conventional transmission electron microscopic observations. Additionally, the deformation mechanisms and corresponding energy barriers of activated slip systems were evaluated by atomistic simulations.

Note: SFB1394 Structural and Chemical atomic Complexity – From Defect Phase Diagrams to Material Properties, project ID 409476157, grant agreement No. 852096 FunBlocks

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Contributing Institute(s):

1. Physik Nanoskaliger Systeme (ER-C-1)
2. Materialwissenschaft u. Werkstofftechnik (ER-C-2)

Research Program(s):

1. 5351 - Platform for Correlative, In Situ and Operando Characterization (POF4-535) (POF4-535)
2. 5353 - Understanding the Structural and Functional Behavior of Solid State Systems (POF4-535) (POF4-535)
3. DFG project G:(GEPRIS)409476157 - SFB 1394: Strukturelle und chemische atomare Komplexität – Von Defekt-Phasendiagrammen zu Materialeigenschaften (409476157) (409476157)
4. FunBlocks - Fundamental Building Blocks – Understanding plasticity in complex crystals based on their simplest, intergrown units (852096) (852096)

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Database coverage:
; ; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; 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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