从硬化析出物的异质成核到均质空间分布：对冷轧 AA2024-T3（铝-铜-镁）的原位 TEM 研究

IF 1.8 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY MRS Communications Pub Date : 2024-06-17 DOI:10.1557/s43579-024-00572-1

Daniel Irmer, Mohamed Sennour, Fan Sun, Philippe Vermaut, Charbel Moussa, Vladimir A. Esin

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引用次数: 0

摘要

摘要通过原位和非原位透射电子显微镜（TEM），研究了冷轧铝合金 2024（Al-Cu-Mg）在人工时效过程中，位错线上的纳米级硬化 S 相沉淀物从异质成核到空间均匀分布的转变过程。研究确定了位错线成核后沉淀演变的三个阶段：(i) 位错线上的生长和凝聚，(ii) 由管道扩散控制的奥斯特瓦尔德熟化，以及 (iii) 由体积扩散控制的奥斯特瓦尔德熟化。在由管道扩散控制的奥斯特瓦尔德熟化活跃期间（第(ii)阶段和从第(ii)阶段到第(iii)阶段的过渡），位错会发生湮灭和/或重新排列。

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From heterogeneous nucleation to homogeneous spatial distribution of hardening precipitates: An in situ TEM study on cold-rolled AA2024-T3 (Al–Cu–Mg)

Abstract

The transition from heterogeneous nucleation of nanoscale hardening S-phase precipitates on dislocation lines in cold-rolled aluminium alloy 2024 (Al–Cu–Mg) to a spatially homogeneous distribution during artificial ageing is studied by means of in situ and ex situ transmission electron microscopy (TEM). Three stages of precipitate evolution following nucleation on dislocation lines are established: (i) Growth and coalescence on dislocation lines, (ii) Ostwald ripening controlled by pipe diffusion, and (iii) Ostwald ripening controlled by volume diffusion. Whilst Ostwald ripening controlled by pipe diffusion is active (stage (ii) and transition from stage (ii) to stage (iii)) dislocation annihilation and/or re-arrangement can occur.

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来源期刊

MRS Communications MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

2.60

自引率

10.50%

发文量

166

审稿时长

>12 weeks

期刊介绍： MRS Communications is a full-color, high-impact journal focused on rapid publication of completed research with broad appeal to the materials community. MRS Communications offers a rapid but rigorous peer-review process and time to publication. Leveraging its access to the far-reaching technical expertise of MRS members and leading materials researchers from around the world, the journal boasts an experienced and highly respected board of principal editors and reviewers.