Comprehensive model of metadislocation movement in Al13Co4
Comprehensive model of metadislocation movement in Al13Co4
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DOI：
10.1016/j.scriptamat.2014.11.006
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发表时间：
2015-03
影响因子：
6
通讯作者：
M. Heidelmann;M. Heggen;C. Dwyer;M. Feuerbacher
中科院分区：
文献类型：
--
作者：
M. Heidelmann;M. Heggen;C. Dwyer;M. Feuerbacher
元位错是调节多种复杂金属合金塑性的高度复杂的缺陷。表征这些缺陷移动过程中原子重排的可用模型仅限于二维和重原子种类。结合高分辨率扫描透射电子显微镜、密度泛函理论和模拟退火，我们在包括所有原子种类的复杂金属合金 Al13Co4 中开发了 12.3 Å 元位错滑移步长的三维模型。核内的重排显示最大原子跳跃距离为 3.4 Å。
Metadislocations are highly complex defects mediating plasticity in several complex metallic alloys. Available models characterizing the atomic rearrangements during the movement of these defects are limited to two dimensions and heavy atomic species. Combining high-resolution scanning transmission electron microscopy, density functional theory and simulated annealing we develop a three-dimensional model of a metadislocation glide step of 12.3 Å in the complex metallic alloy Al13Co4including all atomic species. The rearrangements within the core are shown to involve maximum atomic jump distances of 3.4 Å.