Interlayer growth at interfaces of Ti/ Al-1%Mn, Ti/ Al-4·6%Mg and Ti/pure Al friction weld joints by post-weld heat treatment

A. Fuji, K. Ikeuchi, Yutaka Sato, Hiroyuki Kokawa

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

The interlayer growth at interfaces of Ti/ Al-1% Mn and Ti/ Al-4·6%Mg weld joints was studied by post-weld heat treatment. The heating temperatures ranged from 676 to 873 K (400-600°C) and maximum heating time was 360 ks (100 h). The basic mechanism of interlayer growth for pure Ti/pure Al friction weld joint was also estimated. The interlayer growth rate of Ti/ Al-4·6%Mg joint was much faster than for the Ti/ Al-l%Mn joint. The interlayer mainly consisted of (Al, Si) 3Ti for the Ti/ Al-l%Mn joint, and Al 18Mg 3Ti 2 for the Ti/ Al-4·6%Mg joint. While the interlayer grew from Al alloy substrate to the Ti side for the Ti/ Al-1%Mn joint, it grew from the Ti substrate to the Al alloy side for the Ti/ Al-4·6%Mg joint. The interlayer growth stopped for several hours on heating for 36 ks (10 h). Neither linear nor parabolic time-dependence relations could be exactly fit to the interlayer growth rate for both joints. The interlayer growth of Ti/ Al-1%Mn was proportional to heating time raised to approximately 0·85. The crystal direction of Al 3Ti interlayer growth of the Ti/ Al joint was close to 〈001〉 and 〈111〉 directions obtained by OIM method. Nucleation and nuclei growth were observed at the interface of the Ti/ Al joint. The nucleation and the nuclei growth are the reason for the phenomena (time dependence) described above.

Original languageEnglish
Pages (from-to)507-512
Number of pages6
JournalScience and Technology of Welding and Joining
Volume9
Issue number6
DOIs
Publication statusPublished - 2004 Dec 1

Keywords

  • Friction welding
  • Heat treatment
  • Interlayer
  • Intermetallic compound

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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