Microstructure and microhardness of Ti6246 linear friction weld

Yina Guo, Taenam Jung, Yu Lung Chiu*, Hangyue Li, Simon Bray, Paul Bowen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)


The microhardness and microstructure of linear friction welded Ti-6Al-2Sn-4Zr-6Mo (Ti6246) alloys were studied, in both as-welded and post-weld heat-treated conditions. It has been found that the as-welded Ti6246 has a lower microhardness value of about 360. HV in the central weld zone than that of the base material of about 420. HV. Post-weld heat-treatment of the Ti6246 weld at 600 °C for 1. h has led to the hardness increase of about 180. HV at the central weld zone. Transmission electron microscopy studies show that the microstructure at the central weld zone of the as-welded Ti6246 consists of fine grains with dense acicular orthorhombic α″ martensite. The soft α″ martensite is believed to account for the low hardness measured in the as-welded conditions. Phase transformation from orthorhombic α″ to hexagonal α occurred during the PWHT, resulting in the observed hardness increase.

Original languageEnglish
Pages (from-to)17-24
Number of pages8
JournalMaterials Science and Engineering A
Publication statusPublished - 1 Feb 2013


  • Linear friction welding
  • Microstructure
  • Titanium alloys
  • Transmission electron microscopy

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanical Engineering
  • Mechanics of Materials


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