Variation of the uniaxial tensile behavior of ultrafine-grained pure aluminum after cyclic pre-deformation

Ying Yan; Li-jia Chen; Guo-qiang Zhang; Dong Han; Xiao-wu Li

doi:10.1007/s12613-018-1613-8

Volume 25 Issue 6

Jun. 2018

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2018 > 25(6): 663-671

Ying Yan, Li-jia Chen, Guo-qiang Zhang, Dong Han, and Xiao-wu Li, Variation of the uniaxial tensile behavior of ultrafine-grained pure aluminum after cyclic pre-deformation, Int. J. Miner. Metall. Mater., 25(2018), No. 6, pp. 663-671. https://doi.org/10.1007/s12613-018-1613-8

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Ying Yan, Li-jia Chen, Guo-qiang Zhang, Dong Han, and Xiao-wu Li, Variation of the uniaxial tensile behavior of ultrafine-grained pure aluminum after cyclic pre-deformation, Int. J. Miner. Metall. Mater., 25(2018), No. 6, pp. 663-671. https://doi.org/10.1007/s12613-018-1613-8

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Research Article

Variation of the uniaxial tensile behavior of ultrafine-grained pure aluminum after cyclic pre-deformation

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Corresponding author:
Xiao-wu Li E-mail: xwli@mail.neu.edu.cn
Received: 16 November 2017; Revised: 9 January 2018; Accepted: 20 January 2018

Abstract

Abstract

To explore the influence of cyclic pre-deformation on the mechanical behavior of ultrafine-grained (UFG) materials with a high stacking fault energy (SFE), UFG Al processed by equal-channel angular pressing (ECAP) was selected as a target material and its tensile behavior at different pre-cyclic levels D (D=N_i/N_f, where N_i and N_f are the applied cycles and fatigue life at a constant stress amplitude of 50 MPa, respectively) along with the corresponding microstructures and deformation features were systematically studied. The cyclic pre-deformation treatment on the ECAPed UFG Al led to a decrease in flow stress, and a stress quasi-plateau stage was observed after yielding for all of the different-state UFG Al samples. The yield strength σ_YS, ultimate tensile strength σ_UTS, and uniform strain ε exhibited a strong dependence on D when D ≤ 20%; however, when D was in the range from 20% to 50%, no obvious change in mechanical properties was observed. The micro-mechanism for the effect of cyclic pre-deformation on the tensile properties of the ECAPed UFG Al was revealed and compared with that of ECAPed UFG Cu through the observations of deformation features and microstructures.
- ultrafine-grained aluminum;
- cyclic pre-deformation;
- tensile property;
- microstructure;
- deformation mechanism

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