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

Published online by Cambridge University Press:  10 November 2015


Yang Yang
Affiliation:
School of Material Science and Engineering, Central South University, Changsha 410083, China; Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900, China; State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China; and Key Laboratory of Ministry of Education for Nonferrous Metal Materials Science and Engineering, Central South University, Changsha 410083, China
Ya Dong Chen
Affiliation:
School of Material Science and Engineering, Central South University, Changsha 410083, China
Hai Bo Hu
Affiliation:
Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900, China
Tie Gang Tang
Affiliation:
Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900, China
Ren Rong Long
Affiliation:
State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China
Qing Ming Zhang
Affiliation:
State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China
Corresponding
E-mail address:

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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Copyright
Copyright © Materials Research Society 2015 

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