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Characterization of the secondary phases in spray formed Al–Zn–Mg–Cu–Sc–Zr alloy during hot compression

Published online by Cambridge University Press:  24 June 2016

Z.L. Ning ,
S. Guo ,
M.X. Zhang ,
F.Y. Cao ,
Y.D. Jia  and
J.F. Sun
Z.L. Ning
Affiliation:
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, People's Republic of China; and National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, People's Republic of China
S. Guo
Affiliation:
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, People's Republic of China; and Center of Forecasting and Analysis, Harbin Institute of Technology, Harbin 150001, People's Republic of China
M.X. Zhang
Affiliation:
School of Mechanical and Mining Engineering, The University of Queensland, St Lucia, QLD 4072, Australia
F.Y. Cao
Affiliation:
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, People's Republic of China; and National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, People's Republic of China
Y.D. Jia
Affiliation:
Laboratory for Microstructures, Institute of Materials, Shanghai University, Shanghai 200444, China
J.F. Sun*
Affiliation:
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, People's Republic of China; and National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, People's Republic of China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

An Al–10.83Zn–3.39Mg–1.22Cu–0.16Zr–0.16Sc alloy was produced using the spray deposition technology. The microstructure evolution within temperature ranging between 613 K and 733 K during hot pressing process at different initial strain rate was investigated in a transmission electron microscope (TEM). Partial resolution of the primary precipitates in the deposited microstructure, such as η-MgZn2 and Al3(ScZr), took place. Moreover, new secondary η-MgZn2 and Al3(ScZr) precipitated from the super saturated solid solution and their effects on the recrystallization were also analyzed. The Al3(ScZr) and η-MgZn2 precipitation can act as barriers for the movement of both dislocations and grain boundaries, which are the main factors for hindering the recrystallization. Additionally, the dislocation slide during hot deformation was also investigated in detail. The spray deposition Al–Zn–Mg–Cu alloy own the well deformability, and the typical perfect dislocations can be found in the hot deformation Al–Zn–Mg–Cu alloy.

Keywords

spray depositionmicrostructuretransmission electron microscopy (TEM)
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 16 , 29 August 2016 , pp. 2465 - 2472
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Copyright © Materials Research Society 2016 

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