Temperature-dependent creep aging behavior of 2A14 aluminum alloy

Wenfang Yu; Lihua Zhan; Yongqian Xu; Kai Chen; Youliang Yang; Lingzhi Xu; Nanhui Peng; Bolin Ma; Cong Liu; Zanchong Chen

Journal of Materials Research and Technology (Jul 2022)

Temperature-dependent creep aging behavior of 2A14 aluminum alloy

Wenfang Yu,
Lihua Zhan,
Yongqian Xu,
Kai Chen,
Youliang Yang,
Lingzhi Xu,
Nanhui Peng,
Bolin Ma,
Cong Liu,
Zanchong Chen

Affiliations

Wenfang Yu: State Key Laboratory of High-Performance Complex Manufacturing, Central South University, Changsha 410083, China; School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China
Lihua Zhan: State Key Laboratory of High-Performance Complex Manufacturing, Central South University, Changsha 410083, China; School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China; Light Alloy Research Institute of Central South University, Changsha, 410083, China; Corresponding author.
Yongqian Xu: State Key Laboratory of High-Performance Complex Manufacturing, Central South University, Changsha 410083, China; School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China; Light Alloy Research Institute of Central South University, Changsha, 410083, China; Corresponding author.
Kai Chen: State Key Laboratory of High-Performance Complex Manufacturing, Central South University, Changsha 410083, China; School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China
Youliang Yang: State Key Laboratory of High-Performance Complex Manufacturing, Central South University, Changsha 410083, China; School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China
Lingzhi Xu: State Key Laboratory of High-Performance Complex Manufacturing, Central South University, Changsha 410083, China; School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China
Nanhui Peng: State Key Laboratory of High-Performance Complex Manufacturing, Central South University, Changsha 410083, China; School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China
Bolin Ma: State Key Laboratory of High-Performance Complex Manufacturing, Central South University, Changsha 410083, China; Light Alloy Research Institute of Central South University, Changsha, 410083, China
Cong Liu: State Key Laboratory of High-Performance Complex Manufacturing, Central South University, Changsha 410083, China; School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China
Zanchong Chen: State Key Laboratory of High-Performance Complex Manufacturing, Central South University, Changsha 410083, China; School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China

Journal volume & issue: Vol. 19
pp. 1343 – 1354

Abstract

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The creep deformation behavior, aging hardening response and microstructure evolution of 2A14 aluminum alloy (Al-4.81wt%Cu-0.66wt%Mg-0.97wt%Si) at different temperatures have been systematically investigated by creep test, tensile test, transmission electron microscopy and differential scanning calorimetry. The results show that the total creep strain and steady-state creep rate significantly increase with increasing temperature in the range of 408 K–458 K, while the creep behaviors at the optimum aging temperature of 433 K have shortest primary creep stage and lowest stress sensitivity. Pinning of dislocations by the dense and fine Q′ and θ′ phases precipitated in the alloy creep-aged at 433 K, which contributes to obtaining the best mechanical properties. Also, the primary creep deformation mechanism at different aging temperatures has been discussed. A reference temperature describing the degree of the interaction between aging precipitates and dislocations is introduced into the hyperbolic-sine creep model. The creep strain predicted through the temperature-dependent creep model is in good agreement with the experimental data. The research can provide theoretical support for the temperature-varying creep age forming application in the 2A14 aluminum alloy components.

Published in Journal of Materials Research and Technology

ISSN: 2238-7854 (Print); 2214-0697 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.journals.elsevier.com/journal-of-materials-research-and-technology/

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