Microstructure characteristics of as-surface nanocrystallized 1420 aluminum alloy by high-energy shot peening

Lan Qing Hu, Ke Wang, Gang Liu, Bing She Xu

Research output: Contribution to journalArticle

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Abstract

A nanostructured surface layer was fabricated on 1420 aluminum alloy by high-energy shot peening. Microstructures were characterized by X-ray diffractometer (XRD), transmission electron microscope (TEM) and high-resolution electron microscope (HRTEM), and microhardness measurement was conducted along the depth from top surface layer to matrix of the sample peened for 30 min. The results show that a nanocrystalline layer about 20 μm in thickness is formed on the surface of the sample after high-energy shot peening, in which the grain size is changed from about 20 nm to 100 nm. In the surface layer of 20-50 μm in depth, the microstructure consists of sub-micron grains. The surface nanocrystallization is accomplished by dislocation slip. The microhardness of the top surface nanostructured layer is enhanced obviously after high-energy shot peening (HESP) compared with that of the coarse-grained matrix.

Original languageEnglish (US)
Pages (from-to)615-618
Number of pages4
JournalTransactions of Nonferrous Metals Society of China (English Edition)
Volume15
Issue number3
StatePublished - Jun 1 2005

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Geotechnical Engineering and Engineering Geology
  • Metals and Alloys
  • Materials Chemistry

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