Study on the Influence of Nickel Additions on AA7020 Formability Under Superplastic Forming Like Conditions

S. Taylor; V. Janik; R. Grimes; R. Dashwood

doi:10.1007/s12540-023-01396-9

Study on the Influence of Nickel Additions on AA7020 Formability Under Superplastic Forming Like Conditions

S. Taylor, V. Janik, R. Grimes, R. Dashwood

University of Warwick

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

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Abstract

This study set out to look at the influence of nickel additions on a commercially available AA7020 to understand the impact of the resultant intermetallics on recrystallization, formability and material strength. Elevated temperature tensile testing across a range of strain rates (5 × 10⁻⁴s⁻¹ × 10⁻¹ s⁻¹) and three temperatures (450− 500 °C) to compare material ductility followed by gas bulge testing at 475 °C and two gas pressures to investigate formability in a test closer to industrial forming conditions. Material strength was established using standard tensile testing, and EBSD used to understand the microstructural evolution of the materials. It was seen that the nickel additions increased ductility of the material across all test conditions, coupled with increasing the material strength. This was achieved due to the formation of nickel rich intermetallics which refine the microstructure during pre-heating through particle stimulated nucleation and subsequently improve strength through precipitation hardening in aging treatments. Graphic Abstract: [Figure not available: see fulltext.].

Original language	English
Pages (from-to)	2597-2604
Number of pages	8
Journal	Metals and Materials International
Volume	29
Issue number	9
Early online date	11 Feb 2023
DOIs	https://doi.org/10.1007/s12540-023-01396-9
Publication status	Published - Sept 2023

Bibliographical note

This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

Funder

The authors would like to acknowledge EPSRC for funding of this project, and Superform for both funding and research support during the project. The authors would also like to thank Norsk Hydro for material supply and in particular Simon Miller Jupp for instigating the investigation of nickel additions. In addition to that, the characterisation facility is supported from the Higher Education Funding Council for England (HEFCE) fund and the WMG Centre High Value Manufacturing Catapult is gratefully acknowledged.

Keywords

Aluminium
Aluminium alloys
EBSD
Quick plastic forming
Superplastic forming

ASJC Scopus subject areas

Condensed Matter Physics
Mechanics of Materials
Metals and Alloys
Materials Chemistry

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PublishedFinal published version, 2.74 MBLicence: CC BY

Cite this

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title = "Study on the Influence of Nickel Additions on AA7020 Formability Under Superplastic Forming Like Conditions",

abstract = "This study set out to look at the influence of nickel additions on a commercially available AA7020 to understand the impact of the resultant intermetallics on recrystallization, formability and material strength. Elevated temperature tensile testing across a range of strain rates (5 × 10−4s−1 × 10−1 s−1) and three temperatures (450− 500 °C) to compare material ductility followed by gas bulge testing at 475 °C and two gas pressures to investigate formability in a test closer to industrial forming conditions. Material strength was established using standard tensile testing, and EBSD used to understand the microstructural evolution of the materials. It was seen that the nickel additions increased ductility of the material across all test conditions, coupled with increasing the material strength. This was achieved due to the formation of nickel rich intermetallics which refine the microstructure during pre-heating through particle stimulated nucleation and subsequently improve strength through precipitation hardening in aging treatments. Graphic Abstract: [Figure not available: see fulltext.].",

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Study on the Influence of Nickel Additions on AA7020 Formability Under Superplastic Forming Like Conditions

Abstract

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