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Microstructural evolution and mechanical properties of a 5052 Al alloy with gradient structures

Published online by Cambridge University Press:  14 August 2017

Yusheng Li Open the ORCID record for Yusheng Li [Opens in a new window] ,
Lingzhen Li ,
Jinfeng Nie ,
Yang Cao ,
Yonghao Zhao  and
Yuntian Zhu
Yusheng Li*
Affiliation:
Nano Structural Materials Center, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
Lingzhen Li*
Affiliation:
Nano Structural Materials Center, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
Jinfeng Nie
Affiliation:
Nano Structural Materials Center, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
Yang Cao
Affiliation:
Nano Structural Materials Center, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
Yonghao Zhao
Affiliation:
Nano Structural Materials Center, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
Yuntian Zhu
Affiliation:
Nano Structural Materials Center, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China; and Department of Materials Science and Engineering, North Carolina State University, Raleigh, North Carolina 27695, USA
*
a) Address all correspondence to this author. e-mail: liyusheng@njust.edu.cn
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Abstract

In this paper, we report on the microstructural evolution and mechanical properties of a 5052 Al alloy processed by rotationally accelerated shot peening (RASP). A thick deformation layer of ∼2 mm was formed after the RASP process. Nano-sized grains, equiaxed subgrains, and elongated subgrains were observed along the depth of the deformation layer. Dislocation accumulation and dynamic recrystallization were found primarily responsible for the grain refinement process. An obvious microhardness gradient was observed for all of the samples with different RASP processing parameters, and the microhardness in the top surface of 50 m/s-5 min RASP-processed sample is twice that of its coarse-grained (CG) counterpart. The yield strengths of the RASP-processed 5052 Al alloy samples were 1.4–2.6 times that of CG counterparts, while retaining a decent ductility (25–84% that of CG). The superior properties imparted by the gradient structure are expected to expand the application of the 5052 Al alloy as a structural material.

Keywords

gradient structure5052 Al alloyRASPmicrostructuremechanical properties

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Footnotes

Contributing Editor: Lei Lu

This section of Journal of Materials Research is reserved for papers that are reviews of literature in a given area.

b)

This author was an editor of this journal during the review and decision stage. For the JMR policy on review and publication of manuscripts authored by editors, please refer to http://www.mrs.org/editor-manuscripts/.

A previous error in this article has been corrected. For details, see 10.1557/jmr.2017.459

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