间歇可塑性声学剖面图

IF 8.3 1区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Mostafa M. Omar, Jaafar A. El-Awady
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引用次数: 0

摘要

揭示金属变形的复杂性需要对位错动力学及其间歇性行为有深刻的理解。本文利用Ni单晶微柱原位微压缩过程中的高分辨率声发射(AE)测量,揭示了位错雪崩快速变形动力学的新见解。对声发射信号的频谱分析揭示了单个应变爆发期间的多个短波,揭示了以前隐藏的丰富的间歇性可塑性景观。我们的分析确定了与不同变形阶段相关的不同声学特征:早期的大型雪崩产生强烈的声发射爆发,而后期以密集的位错网络为特征的声发射信号的振幅较低。值得注意的是,给定所使用的传感器,在所有记录的雪崩中观察到一致的AE频带,范围从30到50 kHz,直接将该光谱特征与通过晶格移动的位错运动学联系起来。这些发现为块状金属变形过程中的位错动力学提供了一种无损表征方法,并建立了缺陷动力学与宏观变形行为之间的定量联系。更广泛地说,这项工作突出了基于ae的技术的潜力,为晶体材料塑性的基本机制提供了见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Acoustic profiling of intermittent plasticity

Acoustic profiling of intermittent plasticity

Acoustic profiling of intermittent plasticity
Unraveling the complexities of metal deformation requires a deep understanding of dislocation dynamics and their intermittent behavior. Here, high-resolution acoustic emissions (AE) measurements during in situ microcompression of Ni single-crystal micropillars are used to reveal new insights into the rapid deformation dynamics of dislocation avalanches. Spectral analysis of the AE signals uncovers multiple short waves during individual strain bursts, exposing a rich landscape of intermittent plasticity that was previously hidden. Our analysis identifies distinct acoustic signatures that correlate with various stages of deformation: early-stage large avalanches generate strong AE bursts, while later stages characterized by denser dislocation networks emit AE signals of lower amplitude. Notably, given the used sensor, a consistent AE frequency band ranging from 30 to 50 kHz is observed across all recorded avalanches, directly linking this spectral feature to the kinematics of dislocations moving through the crystal lattice. These findings provide a non-destructive characterization approach of dislocation dynamics during the deformation of bulk metals and establish quantitative connections between defect dynamics and macroscopic deformation behavior. More broadly, this work highlights the potential for AE-based techniques to provide insights into the fundamental mechanisms of plasticity in crystalline materials.
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来源期刊
Acta Materialia
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.
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