Microstructure and characterization of surface nanocrystallization of aluminum alloy

Lan Qing Hu, Mao Lin Li, Ke Wang, Gang Liu, Ying Hui Wei, Bin She Xu

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7 Scopus citations

Abstract

A nanostructured surface layer was fabricated on an aluminum alloy 1420 by using a high-energy shot peening (HESP) technique. HESP induced structure alone the depth of the treated sample surface layer was characterized by means of X-ray diffraction, transmission electron microscope and high-resolution electron microscope; and the hardness variation along the depth of the treated sample was examined. Experimental results show that nano-structured surface layer of about 20μm of thickness is formed after HESP, the average grain size increases from about 20 nm in the surface layer to about 100 nm at a depth of 20μm. In the region of 20-50μm deep from the surface, there exists submicro-fine grained layer. The degree of the surface crystallization is related to the amount of the plasticity deformation. The surface nanocrystallization can realize by the method of the plastic deformation of dislocation slipping. The hardness of nanostructured surface layer is enhanced significantly after HESP compared with that of the initial sample.

Original languageEnglish (US)
Pages (from-to)2016-2020
Number of pages5
JournalZhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals
Volume14
Issue number12
StatePublished - Dec 1 2004

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Metals and Alloys
  • Materials Chemistry

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