Influence of chemical composition on the room temperature plas-ticity of C15 Ca-Al-Mg Laves phases
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arXiv
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| Autori principali: | , , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866909143514742784 |
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| author | Freund, Martina Xie, Zhuocheng Sun, Pei-Ling Berners, Lukas Spille, Joshua Wan, Hexin Thomas, Carsten Feuerbacher, Michael Lipinska-Chwalek, Marta Mayer, Joachim Korte-Kerzel, Sandra |
| author_facet | Freund, Martina Xie, Zhuocheng Sun, Pei-Ling Berners, Lukas Spille, Joshua Wan, Hexin Thomas, Carsten Feuerbacher, Michael Lipinska-Chwalek, Marta Mayer, Joachim Korte-Kerzel, Sandra |
| contents | 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.-% Mg addition (Ca33Al61Mg6) and 10.8 at.-% Mg and 3.0 at.-% Ca addition (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, 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_13432 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Influence of chemical composition on the room temperature plas-ticity of C15 Ca-Al-Mg Laves phases Freund, Martina Xie, Zhuocheng Sun, Pei-Ling Berners, Lukas Spille, Joshua Wan, Hexin Thomas, Carsten Feuerbacher, Michael Lipinska-Chwalek, Marta Mayer, Joachim Korte-Kerzel, Sandra Materials Science 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.-% Mg addition (Ca33Al61Mg6) and 10.8 at.-% Mg and 3.0 at.-% Ca addition (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, 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. |
| title | Influence of chemical composition on the room temperature plas-ticity of C15 Ca-Al-Mg Laves phases |
| topic | Materials Science |
| url | https://arxiv.org/abs/2403.13432 |