A coupled model for precipitation strengthening in Mg-Zn alloys

IF 8.3 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Acta Materialia Pub Date : 2024-09-17 DOI:10.1016/j.actamat.2024.120392

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Abstract

A recently developed precipitation model is coupled to an original mechanical model to predict the strength evolution in Mg-Zn alloys during aging. The proposed models consider the strengthening effects of rod and plate-shaped precipitates on the most important deformation mechanisms in Mg alloys: basal slip, prismatic slip, and twinning. It is found that shearing of rod precipitates dominates the strengthening on basal slip at early aging stages, while the bypass mechanism dominates medium and over-aging stages. On prismatic planes, the bypass of rod precipitates dominates across all aging stages. The influence of different precipitate arrangements and aspect ratios on modelling results is also discussed. The strengthening from plate-shaped precipitates is found to be very poor for the studied slip modes. While for twinning, the strength evolution is nicely represented by bypassing of rod-shaped precipitates. The evolutions of tensile and compressive yield strength during aging are well predicted by considering the hardening on prismatic and twinning planes, respectively.

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最新开发的析出模型与原始力学模型相结合，可预测镁锌合金在老化过程中的强度演变。提出的模型考虑了棒状和板状析出物对镁合金中最重要的变形机制（基底滑移、棱柱滑移和孪晶）的强化作用。研究发现，在早期时效阶段，棒状析出物的剪切对基底滑移的强化起主导作用，而在中期和超时效阶段，旁路机制起主导作用。在棱柱平面上，棒状析出物的旁路作用在所有老化阶段都占主导地位。此外，还讨论了不同的析出物排列和长宽比对模型结果的影响。在所研究的滑移模式中，板状析出物的强化效果很差。而对于孪晶，通过绕过棒状析出物，强度演变得到了很好的体现。通过考虑棱柱面和孪晶面的硬化，可以很好地预测老化过程中拉伸和压缩屈服强度的变化。

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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.