TY - GEN

T1 - Influence of the Quenching Rate and Natural Ageing Duration on the Formability and Mechanical Properties of EN AW-7075

AU - Behrens, B. A.

AU - Hübner, S.

AU - Vogt, H.

AU - Golovko, O.

AU - Behrens, S.

AU - Nürnberger, F.

N1 - Funding Information: Acknowledgments The project “Tailored Tempering of 7xxx-Aluminum Alloys” Ref.-No. AiF 20190N was financed and supervised by the European Research Association for Sheet Metal Working (EFB). In the scope of the program to promote Industrial Collective Research, it was funded by the German Federation of Industrial Research Associations (AiF) by means of the Federal Ministry of Economic Affairs and Energy (BMWi) on the basis of a decision by the German Bundestag. Furthermore, the authors would like to thank the industrial partners in this research project.

PY - 2021

Y1 - 2021

N2 - Due to the low density and high tensile strength, the aluminium alloy EN AW-7075 offers a high lightweight potential for structural components. In recent years, 7xxx-aluminium alloys have been the subject of numerous investigations in the field of warm and hot forming and suitable heat treatments to fully use their potential for applications in automotive bodies. Alternatively, forming blanks of these alloys at room temperature in the W-temper state is favourable since conventional tools can be used. However, this condition is unstable. As the ageing duration after quenching increases, the formability decreases due to natural ageing. Hence, the objective of this investigation was to determine the formability of EN AW-7075 as a function of the ageing time. Furthermore, since the quenching rate after solution heat treatment influences the resulting mechanical properties, an adapted process route to manufacture components with tailored properties was explored. For this purpose, samples were partially quenched after solution heat treatment and then artificially aged. To determine the influence of the quenching rate, hardness tests were carried out.

AB - Due to the low density and high tensile strength, the aluminium alloy EN AW-7075 offers a high lightweight potential for structural components. In recent years, 7xxx-aluminium alloys have been the subject of numerous investigations in the field of warm and hot forming and suitable heat treatments to fully use their potential for applications in automotive bodies. Alternatively, forming blanks of these alloys at room temperature in the W-temper state is favourable since conventional tools can be used. However, this condition is unstable. As the ageing duration after quenching increases, the formability decreases due to natural ageing. Hence, the objective of this investigation was to determine the formability of EN AW-7075 as a function of the ageing time. Furthermore, since the quenching rate after solution heat treatment influences the resulting mechanical properties, an adapted process route to manufacture components with tailored properties was explored. For this purpose, samples were partially quenched after solution heat treatment and then artificially aged. To determine the influence of the quenching rate, hardness tests were carried out.

KW - 7xxx-aluminium alloys

KW - Cold forming

KW - Formability

KW - Tailored tempering

UR - http://www.scopus.com/inward/record.url?scp=85112492697&partnerID=8YFLogxK

U2 - 10.1007/978-3-030-75381-8_80

DO - 10.1007/978-3-030-75381-8_80

M3 - Conference contribution

AN - SCOPUS:85112492697

SN - 9783030753801

T3 - Minerals, Metals and Materials Series

SP - 959

EP - 971

BT - Forming the Future

A2 - Daehn, Glenn

A2 - Cao, Jian

A2 - Kinsey, Brad

A2 - Tekkaya, Erman

A2 - Vivek, Anupam

A2 - Yoshida, Yoshinori

T2 - 13th International Conference on the Technology of Plasticity, ICTP 2021

Y2 - 25 July 2021 through 30 July 2021

ER -