Effect of cold rolling on the formation and distribution of nanoclusters during pre-aging in an Al-Mg-Si alloy

A. Serizawa, T. Sato, M. K. Miller

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

The effect of high densities of dislocations on the formation behavior of two types of nano-scale clusters (nanoclusters), which are formed at room temperature or during pre-aging at ~373. K in an Al-Mg-Si alloy, was investigated by atom probe tomography. Cold rolling was applied to modify the formation behavior and/or the characteristics of the nanoclusters and also the precipitation sequence, which involve both nanoclusters and a strengthening phase to improve the bake-hardening response. Nanoclusters formed during pre-aging tended to form along the dislocations. Cold rolling accelerated the preferential formation of the nanoclusters, whereas the number density of the nanoclusters decreased by cold rolling before pre-aging. However, the number density of the nanoclusters was considerably higher than that of the Β″ phase. Cold rolling before pre-aging enhanced the age-hardenability the most compared with other processes such as the contemporary pre-aging process. It is considered that the nanoclusters along dislocations lead to the preferential transformation to the Β phase and then the rapid growth of the Β″ phase. The nanoclusters formed on dislocations are effective in improving the bake-hardening response for the duration of the bake-hardening process. The kinetics and the distribution of the nanoclusters were found to be affected by the dislocations which were induced by cold rolling.

Original languageEnglish
Pages (from-to)492-497
Number of pages6
JournalMaterials Science and Engineering A
Volume561
DOIs
Publication statusPublished - 2013 Jan 20

Keywords

  • Al-Mg-Si alloys
  • Atom probe tomography
  • Bake-hardening response
  • Dislocation-nanocluster interaction
  • Hardness measurement
  • Nanocluster

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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