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Microstructural evolution and thermal stability of 1050 commercial pure aluminum processed by high-strain-rate deformation

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Abstract

Microstructural and property evolution of 1050 commercial pure aluminum subjected to high-strain-rate deformation (1.2–2.3 × 103 s−1) by split Hopkinson pressure bar (SHPB) and subsequent annealing treatment were investigated. The as-deformed and their annealed samples at 373–523 K were characterized by transmission electron microscopy (TEM) and microhardness tests. TEM observations reveal that the as-deformed sample is mainly composed of a lamellar structure, whose transverse/longitudinal average subgrain/cell sizes are 293 and 694 nm, respectively. The initial coarse grains are refined significantly. The initial lamellar grain structures are subdivided into pancake-shaped subgrains due to a gradual transition by triple junction motion at 473 K, and then a dramatic microstructural coarsening is observed at 523 K. It is suggested that annealing behavior of this dynamic loading structure is better considered as a continuous process of grain coarsening or continuous recovery.

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ACKNOWLEDGMENTS

This work is supported by the National Natural Science Foundation of China (No. 51274245), NSAF (No. U1330126), the Ph.D. Programs Foundation of Ministry of Education of China (No. 20120162130006), the Hunan Provincial Natural Science Foundation of China (No. 14JJ2011), and the key project of State Key Laboratory of Explosion Science and Technology (No. KFJJ11-1).

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Authors and Affiliations

  1. School of Material Science and Engineering, Central South University, Changsha, 410083, China

    Yang Yang & Ya Dong Chen

  2. Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang, 621900, China

    Yang Yang, Hai Bo Hu & Tie Gang Tang

  3. State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing, 100081, China

    Yang Yang, Ren Rong Long & Qing Ming Zhang

  4. Key Laboratory of Ministry of Education for Nonferrous Metal Materials Science and Engineering, Central South University, Changsha, 410083, China

    Yang Yang

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  1. Yang Yang
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Correspondence to Ya Dong Chen.

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Yang, Y., Chen, Y.D., Hu, H.B. et al. Microstructural evolution and thermal stability of 1050 commercial pure aluminum processed by high-strain-rate deformation. Journal of Materials Research 30, 3502–3509 (2015). https://doi.org/10.1557/jmr.2015.341

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