Role of vacancy-solute complex in the initial rapid age hardening in an Al-Cu-Mg alloy

Y. Nagai, M. Murayama, Z. Tang, T. Nonaka, K. Hono, M. Hasegawa

Research output: Contribution to journalArticlepeer-review

132 Citations (Scopus)

Abstract

We have investigated the origin of the initial rapid hardening of an Al-1.3 at.% Mg-1.7 at.% Cu alloy by coincidence Doppler broadening of positron annihilation radiation and positron lifetime spectroscopy. Quenched-in vacancies are bound to Mg atoms rather than Cu atoms initially and the vacancy-Mg complexes easily migrate to vacancy sinks at 150°C. Vacancy-Mg-Cu complexes form during the initial 1 min aging at vacancy sinks, meanwhile vacancy density decreases rapidly. These results support that the dislocation-solute interaction is the origin of the initial rapid hardening.

Original languageEnglish
Pages (from-to)913-920
Number of pages8
JournalActa Materialia
Volume49
Issue number5
DOIs
Publication statusPublished - 2001 Mar 14

Keywords

  • Aging lattice defects - vacancy
  • Alloys - aluminium
  • Probe methods - positron
  • Transmission electron microscopy (TEM)

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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