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Effects of Dynamic Multi-directional Loading on the Microstructural Evolution and Thermal Stability of Pure Aluminum

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Abstract

Microstructural evolution and thermal stability of 1050 commercial pure aluminum processed by means of split Hopkinson pressure bar and Instron-3369 mechanical testing machine to an accumulated strain of 3.6 were investigated. The nominal strain rates reached up to 3.0 × 103 and 1 × 10−3/s, respectively. Samples in the deformed state and annealed in the temperature interval 423–523 K for 1 h were characterized by transmission electron microscopy (TEM). TEM observations reveal that the initial coarse grains are refined significantly, and the deformed structures mainly consist of equiaxed subgrains and dislocation cells with a high density of interior dislocation. In addition, the average subgrain/cell sizes of these two kinds of deformed samples are nearly the same. As to recovery behavior, recovered subgrains are observed at 473 (dynamic) versus 523 K (quasi-static), that is to say, recovery is fairly slow in the quasi-static deformed samples. It is therefore to be expected that thermal stability of this dynamic deformed aluminum is weaker than that of the quasi-static compressed one, which is due to the higher density of dislocation and nonequilibrium dislocation configurations produced during dynamic loading.

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Acknowledgments

This work is supported by the National Natural Science Foundation of China (Nos. 51274245, 51574290), 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, Hua Zhang & Yadong Chen

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

    Yang Yang

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

    Yang Yang

  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 Yang Yang.

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Yang, Y., Zhang, H. & Chen, Y. Effects of Dynamic Multi-directional Loading on the Microstructural Evolution and Thermal Stability of Pure Aluminum. J. of Materi Eng and Perform 25, 3924–3930 (2016). https://doi.org/10.1007/s11665-016-2233-y

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  • DOI: https://doi.org/10.1007/s11665-016-2233-y

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