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

  • Yang Yang (a1), Ya Dong Chen (a2), Hai Bo Hu (a3), Tie Gang Tang (a3), Ren Rong Long (a4) and Qing Ming Zhang (a4)...

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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a)Address all correspondence to this author. e-mail: yadongchen1990@163.com

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