Plastic instability criterion based on new necking parameters for Cu-Al, Cu-A5052, and Cu-A5083 roll-bonded laminated metal composites fabricated without post-annealing

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NSTL
Elsevier

外文摘要：Although laminated metal composites fabricated by accumulative roll bonding (ARB) undergo kink-band formation, there are no guidelines for optimizing their fabrication to avoid necking and shear localization without post-annealing. The necking of the composite layers during rolling generates non-uniformities that may degrade the mechanical performance of the composite. This paper proposes a model for laminated metal composites that aims to quantitatively assess and predict necking based on the work-hardening of each layer. Cu-Al-, Cu-A5052-, and Cu-A5083-laminated metal composites were fabricated using ARB at room temperature (~300 K) without post-annealing, and they were subjected to mechanical and microstructural analyses. A normalized neck amplitude was introduced as a new parameter that accurately predicted the degree of necking observed experimentally. Another new parameter, an instability index, was introduced to frame the necking criterion of the hard layers. A plastic instability criterion framed based on the new parameters accurately predicted the degree of necking in the hard layers of the as-prepared laminated metal composites. These findings may be applied to guide the fabrication of metal composites of any composition using the ARB process.

外文关键词：

Accumulative roll bondingNeckingLaminated metal compositesUltrafine grainsMille-feuille structureCOMMERCIAL PURITY ALUMINUMSTRAIN-RATE SENSITIVITYKINK BAND PROPAGATIONMECHANICAL-PROPERTIESBONDING ARBMULTILAYER COMPOSITESHEAT-TREATMENTMICROSTRUCTUREDEFORMATIONEVOLUTION

作者：

Miyajima, Yoji、Yamada, Takuya、Fujii, Toshiyuki

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作者单位：

Kanazawa Univ

Tokyo Inst Technol

出版年：

2022

DOI：

10.1016/j.jmatprotec.2022.117634

Journal of Materials Processing Technology

EISCI

ISSN：0924-0136

年,卷(期)：2022.306

被引量3
参考文献量50