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Influence of Deformation Temperature On Flow Stress and Dislocation Structure of 2A12 Aluminum Alloy Under Quasi-Static and Dynamic Compression

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Abstract

Background

In many constitutive models for dynamic strain aging of aluminum alloys, the athermal component of flow stress was commonly assumed to be independent of temperature and strain rate. However, the assumption has not been examined experimentally due to lacking of a reliable and quantitative method to obtain statistical information of dislocation structure in the deformed aluminum alloys.

Objective

Develop a novel X-ray diffraction procedure to characterize the evolution of dislocation structure in aluminum alloys over a wide range of temperatures and strain rates, and further clarify the contributions arising from the structural and thermal components of flow stress.

Methods

The quasi-static and dynamic compression of artificial aged 2A12 aluminum alloy was carried out at the strain rates of 5×10-3 and 1×103 s-1 and within a temperature range of 173-673 K. The dislocation structure in the deformed aluminum alloy was determined by the newly developed X-ray line profile analysis procedure (CMWP). In combination with mechanical and X-ray diffraction tests, the correlation between the flow stress and microstructure for the aluminum alloy was established.

Results

X-ray diffraction measurements showed the dislocation density in the deformed 2A12 aluminum alloy is temperature and strain rate dependence. Besides the structural or athermal component of flow stress calculated from the measured microstructure parameters, a bell-shaped flow stress was revealed clearly in the total flow stress, which can be attributed primarily to the dynamic strain aging mechanism.

Conclusions

In this work, a fairly concise routine was proposed to characterize the microstructure and estimate the deformation mechanism for the 2A12 aluminum alloy, and the methodology could be easily extended to other alloys.

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Data Availability

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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Acknowledgements

Z.F. is grateful to the Director Foundation of China Academy of Engineering Physics (Grant No. YZ2019004) and the National Key Research and Development Program of China (No. 2021YFA1600604), Z.S. acknowledges the National Natural Science Foundation of China (Grant No. 11932018), G.R. & T.U. are grateful for the support of OTKA grant K124926 funded by the Hungarian National Research, Development and Innovation Office (NKFIH).

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Authors and Affiliations

  1. Key Laboratory of Neutron Physics and Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, 621999, China

    Z. Fan

  2. Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang, 621999, China

    Z. Song

  3. Institute of Materials, China Academy of Engineering Physics, Mianyang, 621999, China

    D. Xiao

  4. Department of Materials Physics, Eötvös University, Budapest, P.O.Box 32, H-1518, Hungary

    G. Ribárik & T. Ungár

  5. School of Materials, The University of Manchester, Manchester, M13 9PL, UK

    T. Ungár

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  1. Z. Fan
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  4. G. Ribárik
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  5. T. Ungár
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Correspondence to Z. Fan.

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Fan, Z., Song, Z., Xiao, D. et al. Influence of Deformation Temperature On Flow Stress and Dislocation Structure of 2A12 Aluminum Alloy Under Quasi-Static and Dynamic Compression. Exp Mech 63, 703–714 (2023). https://doi.org/10.1007/s11340-023-00950-1

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  • DOI: https://doi.org/10.1007/s11340-023-00950-1

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