Mechanical Properties and Microstructures of Commercial-Purity Aluminum Processed by Rotational Accelerated Shot Peening Plus Cold Rolling

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Yanfang Liu
  • Yang Cao
  • Hao Zhou
  • Xuefei Chen
  • Ying Liu
  • Lirong Xiao
  • Xiaowei Huan
  • Yonghao Zhao

Detail(s)

Original languageEnglish
Article number1900478
Journal / PublicationAdvanced Engineering Materials
Volume22
Issue number1
Online published16 Jul 2019
Publication statusPublished - Jan 2020
Externally publishedYes

Abstract

Commercial-purity aluminum with 99.7% purity is processed by rotational accelerated shot peening (RASP) and cold-rolling. RASP samples are rolled at room temperature to a thickness reduction of 20% and 30%, for the purpose of surface roughness reduction and strengthening. Detailed microstructural characterization and hardness tests reveal that cold-rolling cause grain growth at the surfaces of RASP samples from ≈472 to ≈1000 nm. Moderate cold-rolling is effective in smoothing the surface of RASP samples, while improving strength and maintaining ductility. However, cold-rolling to more than 30% thickness reduction eventually diminishes the gradient nanostructure. During cold-rolling of RASP samples, a transition zone with strong strain incompatibility is noticed by a sharp rise in hardness at some point of the hardness-distribution curve from the surface to the core of the sample. This transition zone is a result of quick generation of geometrically necessary dislocations. Although the transition zone with strong strain incompatibility is short-lived, it is anticipated to be common among gradient-nanostructured materials under cold-rolling condition.

Research Area(s)

  • commercial-purity aluminum, gradient structures, mechanical properties, microstructures, plastic deformation

Citation Format(s)

Mechanical Properties and Microstructures of Commercial-Purity Aluminum Processed by Rotational Accelerated Shot Peening Plus Cold Rolling. / Liu, Yanfang; Cao, Yang; Zhou, Hao; Chen, Xuefei; Liu, Ying; Xiao, Lirong; Huan, Xiaowei; Zhao, Yonghao; Zhu, Yuntian.

In: Advanced Engineering Materials, Vol. 22, No. 1, 1900478, 01.2020.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review