The effect of Cu on mechanical and precipitation properties of Al-Zn-Mg alloys

N. Q. Chinh, J. Lendvai, D. H. Ping, K. Hono

Research output: Contribution to journalArticle

93 Citations (Scopus)

Abstract

The effect of Cu on the mechanical and precipitation properties of a high strength Al-2.4at.% Zn-2.1at.% Mg alloy was investigated by compression and indentation tests, as well as by differential scanning calorimetry (DSC), transmission electron microscopy (TEM) and three-dimensional atom probe field ion microscopy (3DAPFIM). The addition of 0.5at.% Cu introduces significant changes in the precipitation process and consequently in the age-hardening behavior of the alloy. Microstructural measurements reveal that the addition of Cu changes the density of GP zones, but it also changes partly the shape and composition of the particles. Mechanical and microstructural results together lead to the conclusion that clustering of solute atoms and vacancies during or immediately after water quenching plays an important role in the nucleation of intermediate phase precipitates in one-step aging and the addition of Cu to ternary Al-Zn-Mg leads to changes also in the initial clustering process.

Original languageEnglish
Pages (from-to)52-60
Number of pages9
JournalJournal of Alloys and Compounds
Volume378
Issue number1-2
DOIs
Publication statusPublished - Sep 22 2004

Keywords

  • Atom probe field ion- and transmission electron microscopy
  • Metal alloys
  • Precipitation

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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