铝铜合金中板状线性复合体的位错重组和局部攀升产生的强化作用

Pulkit Garg, Daniel S. Gianola, Timothy J. Rupert
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引用次数: 0

摘要

应力驱动的位错偏析可导致不同线性复合状态之间的结构转变。在这项工作中,我们利用原子模拟研究了板状阵列线性复合如何影响差排运动,并量化了铝铜合金中的相关强化效应。血小板复合态的存在会导致差排的分面,纳米级的分段沿血小板生长方向向上攀升,从而形成一种限制后续差排运动的复杂构型。变形时,前沿部分位错必须首先从板状复合体向下爬升,然后在后沿部分位错处进行类似的爬升,以克服沉淀物并开始塑性滑移。线性复合体的差排降解机制与传统的沉淀强化合金截然不同,在传统的沉淀强化合金中,差排是通过剪切穿过或绕过障碍物来克服障碍的。研究发现,将位错从板状络合物中分离出来所需的临界剪切应力与析出物间距成反比,这不仅包括开放空间(如在奥罗恩弓形中观察到的),还包括沿板状颗粒发生爬升的区域。因此,线性复合为直接改变位错结构和改善金属合金的机械性能提供了一种新方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Strengthening from dislocation restructuring and local climb at platelet linear complexions in Al-Cu alloys

Stress-driven segregation at dislocations can lead to structural transitions between different linear complexion states. In this work, we examine how platelet array linear complexions affect dislocation motion and quantify the associated strengthening effect in Al-Cu alloys using atomistic simulations. The presence of platelet complexions leads to the faceting of the dislocations, with nanoscale segments climbing upwards along the platelet growth direction, resulting in a complex configuration that restricts subsequent dislocation motion. Upon deformation, the leading partial dislocation must climb down from the platelet complexions first, followed by a similar sequence at the trailing partial dislocation, in order to overcome the precipitates and commence plastic slip. The dislocation depinning mechanism of linear complexions is strikingly different from traditional precipitation-strengthened alloys, where dislocations overcome obstacles by either shearing through or looping around obstacles. The critical shear stress required to unpin dislocations from platelet complexions is found to be inversely proportional to precipitate spacing, which includes not just the open space (as observed in Orowan bowing) but also the region along the platelet particle where climb occurs. Thus, linear complexions provide a new way to modify dislocation structure directly and improve the mechanical properties of metal alloys.

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期刊介绍: Journal of Materials Science: Materials Theory publishes all areas of theoretical materials science and related computational methods. The scope covers mechanical, physical and chemical problems in metals and alloys, ceramics, polymers, functional and biological materials at all scales and addresses the structure, synthesis and properties of materials. Proposing novel theoretical concepts, models, and/or mathematical and computational formalisms to advance state-of-the-art technology is critical for submission to the Journal of Materials Science: Materials Theory. The journal highly encourages contributions focusing on data-driven research, materials informatics, and the integration of theory and data analysis as new ways to predict, design, and conceptualize materials behavior.
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