Alpha 2 precipitation in exposed Ti6A14V

Zhiwei Wu, Michael H. Loretto, V. Venkatesh, Hamish L. Fraser, R. E. A. Williams, G. B. Viswanathan, S. Nag, Rajarshi Banerjee, Matthew Thomas

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review


Samples of Ti6Al4V have been held at 500°C for times up to 5 weeks and in agreement with phase diagram calculations and with earlier work it has been confirmed that particles of alpha 2 are formed under these conditions. Transition electron microscopy (TEM) and atom probe have been used to characterise the alpha 2 precipitates. In addition the fraction of beta present after these long heat treatments was measured and found to be significantly higher than phase diagram predictions. The fatigue and tensile pr0pertieS of exposed samples have been compared with those of samples slowly cooled from above the transus and TEM is being carried out in order to understand the observed properties. Some work has also been carried out on an alloy developed recently by Timet, Ti-5Al-4V-0. 6Mo-0. 4Fe and alpha 2 is also seen in heat treated samples of the alloy. At the SEM level the volume fraction of beta is again far higher than is predicted from modelling work.

Original languageEnglish
Title of host publicationProceedings of the 12th World Conference on Titanium (TI-2011)
Subtitle of host publication19-24 June, 2011; Beijing China
EditorsLian Zhou, Hui Chang, Yafeng Lu, Dongsheng Xu
Place of PublicationBeijing China
PublisherScience Press
Number of pages4
ISBN (Electronic)9787030338952
ISBN (Print)9787030338990
Publication statusPublished - 2012
Externally publishedYes
EventThe World Conference on Titanium 2011 - China National Convention Center, Beijing, China
Duration: 19 Jun 201124 Jun 2011
Conference number: 12th


ConferenceThe World Conference on Titanium 2011
Abbreviated titleTi 2011
Internet address


  • Long range order
  • Tensile and fatigue properties
  • Titanium 641

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