<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>Laser dynamic flexible forming (LDFF) is a novel high velocity forming (HVF) technology, in which the foil metal is loaded by laser shock wave. Strain localization is readily to occur around the bulge edge, which will result in the ultimate dynamic failure. In this work, the microstructures before and after dynamic fracture are characterized by transmission electron microscopy (TEM) to investigate the dynamic failure mechanism. The plastic deformation regions of copper foil are composed of shock compression, strain localization and bulge. Microstructure refinement was observed in three different plastic deformation regions, particularly, dynamic recrystallization (DRX) occurs in the strain localization and bulge regions. In bulge region, extremely thin secondary twins in the twin/matrix (T/M) lamellae are formed. The microstructure features in the strain localization region show that superplastic flow of material exists until fracture, which may be due to DRX and subsequent grain boundary sliding (GBS) of the recrystallized grains. The grain coarsening in strain localization region may degrade the material flowing ability which results in the dynamic fracture.</p>
</abstract>

Laser dynamic flexible forming (LDFF) is a novel high velocity forming (HVF) technology, in which the foil metal is loaded by laser shock wave. Strain localization is readily to occur around the bulge edge, which will result in the ultimate dynamic failure. In this work, the microstructures before and after dynamic fracture are characterized by transmission electron microscopy (TEM) to investigate the dynamic failure mechanism. The plastic deformation regions of copper foil are composed of shock compression, strain localization and bulge. Microstructure refinement was observed in three different plastic deformation regions, particularly, dynamic recrystallization (DRX) occurs in the strain localization and bulge regions. In bulge region, extremely thin secondary twins in the twin/matrix (T/M) lamellae are formed. The microstructure features in the strain localization region show that superplastic flow of material exists until fracture, which may be due to DRX and subsequent grain boundary sliding (GBS) of the recrystallized grains. The grain coarsening in strain localization region may degrade the material flowing ability which results in the dynamic fracture.

Dynamic failure mechanism of copper foil in laser dynamic flexible forming

Materials Science-Poland

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

{"article-title":"Dynamic failure mechanism of copper foil in laser dynamic flexible forming"}

Laser dynamic flexible forming (LDFF) is a novel high velocity forming (HVF) technology, in which the foil metal is loaded by laser shock wave. Strain...

Dynamic failure mechanism of copper foil in laser dynamic flexible forming

Publié en ligne: 13 avr. 2021

Pages: 684 - 692

Reçu: 19 août 2020

Accepté: 14 janv. 2021

DOI: https://doi.org/10.2478/msp-2020-0083

Mots clés
laser dynamic flexible forming, strain localization, dynamic failure, dynamic recrystallization, grain coarsening

© 2020 Zongbao Shen et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Dynamic failure mechanism of copper foil in laser dynamic flexible forming

Publié en ligne: 13 avr. 2021

Pages: 684 - 692

Reçu: 19 août 2020

Accepté: 14 janv. 2021

DOI: https://doi.org/10.2478/msp-2020-0083

Mots cléslaser dynamic flexible forming, strain localization, dynamic failure, dynamic recrystallization, grain coarsening

© 2020 Zongbao Shen et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Mots clés
laser dynamic flexible forming, strain localization, dynamic failure, dynamic recrystallization, grain coarsening