Texture Evolution during Thermal Processing of Ti-6Al-4V: A Neutron Diffraction Study

Bama Perumal, Salih Gungor, W. Kockelmann, Michael Fitzpatrick, P. Bhavani

Research output: Contribution to journalArticlepeer-review

Abstract

This paper reports results of phase transformation experiments in the α/β alloy Ti-6Al-4V from α→β→α on heating be- low and near the β-transus using in situ neutron diffraction. The development and evolution of crystallographic texture during the α→β→α phase transformation was determined. Annealing at a sub-transus temperature 1562K (850°C) shows similar α-phase and β-phase pole figures from room temperature up to 1562K (850°C), with a slight increase in the intensity of the β-phase pole figures, showing that the β-phase texture strengthens during heating. During cooling, the β→α transformation occurs very quickly and the initial alpha-texture obtained at room temperature is significantly weakened by the heat-treatment. Strengthening of the β-phase texture is observed on heating the sample from [1163K to 1253K (890°C to 980°C), respectively] and a Burgers relationship ((0002) α/(110) β and {11-20} α/{111} β) is seen with the α-phase texture at room temperature; but no evidence of variant selection was observed during α→β transfor- mation. During the β→α phase transformation on cooling, the Burgers relationship holds. This indicates a texture memory effect due to the growth of the primary alpha phase present at high temperature.
Original languageEnglish
Pages (from-to)13-23
Number of pages11
JournalSVOA Materials Science & Technology
Volume3
Issue number2
Publication statusPublished - 1 Apr 2021

Bibliographical note

This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Keywords

  • Ti-6Al-4V
  • Neutron Diffraction
  • Phase Transformation
  • Texture Evolution
  • Texture memory effect

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