Influence of chemical composition on the room temperature plasticity of C15 Ca-Al-Mg Laves phases

IF 8.3 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Acta Materialia Pub Date : 2024-06-27 DOI:10.1016/j.actamat.2024.120124

Martina Freund , Zhuocheng Xie , Pei-Ling Sun , Lukas Berners , Joshua Spille , Hexin Wang , Carsten Thomas , Michael Feuerbacher , Marta Lipinska-Chwalek , Joachim Mayer , Sandra Korte-Kerzel

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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.

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化学成分对 C15 Ca-Al-Mg Laves 相室温塑性的影响

研究了化学成分变化对二元 Ca33Al67 C15 CaAl2 Laves 相室温机械性能的影响，并将其与化学成分（Ca33Al67）进行了比较。采用纳米压痕法对具有多种结晶取向的立方钙-铝-镁拉维斯相进行了表征和变形。根据我们之前的研究，测得 Ca36Al53Mg11 的硬度和压痕模量分别为 4.1 ± 0.3 GPa 和 71.3 ± 1.5 GPa，Ca33Al61Mg6 的硬度和压痕模量分别为 4.6 ± 0.2 GPa 和 80.4 ± 3.8 GPa，Ca33Al67 的硬度和压痕模量分别为 4.9 ± 0.3 GPa 和 85.5 ± 4.0 GPa。由此产生的表面痕迹以及滑移和裂纹平面在压痕表面得以区分，揭示了几种不同的{11n}滑移系统的激活，传统的透射电子显微镜观察进一步证实了这一点。此外，原子模拟还评估了活化滑移系统的变形机制和相应的能量障碍。

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来源期刊

Acta Materialia 工程技术-材料科学：综合

CiteScore

16.10

自引率

8.50%

发文量

801

审稿时长

53 days

期刊介绍： Acta Materialia serves as a platform for publishing full-length, original papers and commissioned overviews that contribute to a profound understanding of the correlation between the processing, structure, and properties of inorganic materials. The journal seeks papers with high impact potential or those that significantly propel the field forward. The scope includes the atomic and molecular arrangements, chemical and electronic structures, and microstructure of materials, focusing on their mechanical or functional behavior across all length scales, including nanostructures.

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