Influence of chemical composition on the room temperature plas-ticity of C15 Ca-Al-Mg Laves phases
arxiv(2024)
Abstract
The influence of chemical composition changes on the room temperature
mechanical proper-ties in the C15 CaAl2 Laves phase were investigated in two
off-stoichiometric compositions with 5.7 at.-
10.8 at.-
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,
respectively. The resulting surface traces as well as slip and crack planes,
were distinguished on the indentation surfac-es, 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.
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