Aging and precipitation behavior in supersaturated Al-2%Fe alloy produced by high-pressure torsion

Jorge M. Cubero-Sesin, Masashi Watanabe, Makoto Arita, Zen Ji Horita

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

The aging behavior of a cast Al-2 wt.% Fe alloy processed by High-Pressure Torsion (HPT) at room temperature was studied by subsequent aging treatments at 200 °C. Observations by Transmission Electron Microscopy (TEM) revealed that the microstructure after HPT processing reached an ultrafine-grained level with an average grain size in the Al matrix of ~120 nm. The initial eutectic structures were fragmented into particles with sizes of less than 400 nm and partially dissolved in the matrix up to a supersaturated Fe content of ~1% as confirmed by X-Ray Diffraction (XRD) analysis. The peak-age condition was achieved within 0.25 h of aging, which provides the maximum hardness of ~200 HV. Analyses by high-resolution S/TEM show that round particles of Al6Fe with sizes of ~5-10 nm and semi-coherent with the matrix are the dominant precipitates in the peak-aged condition. The hardness increases by aging for 12 h above the as-HPT-processed level of 185 HV. The dominant precipitate phase transforms to Al3Fe in the over-aged condition with a loss of coherency during growth. Enhanced precipitation kinetics was observed because of high density of lattice defects induced by the HPT processing, which were also confirmed by significant recovery in the electrical conductivity of the samples after aging.

Original languageEnglish
Title of host publicationAluminium Alloys, ICAA 2014
EditorsKnut Marthinsen, Bjørn Holmedal, Yanjun Li
PublisherTrans Tech Publications Ltd
Pages766-771
Number of pages6
ISBN (Print)9783038351207
DOIs
Publication statusPublished - Jan 1 2014
Event14th International Conference on Aluminium Alloys, ICAA 2014 - Trondheim, Norway
Duration: Jun 15 2014Jun 19 2014

Publication series

NameMaterials Science Forum
Volume794-796
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752

Other

Other14th International Conference on Aluminium Alloys, ICAA 2014
CountryNorway
CityTrondheim
Period6/15/146/19/14

All Science Journal Classification (ASJC) codes

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

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