Phase Stability of Titanium Alloys
- Event time: 1:00pm
- Event date: 16th June 2011
- Speaker: Bengt Tegner (Formerly School of Physics & Astronomy, University of Edinburgh)
- Location: Room 2511, James Clerk Maxwell Building (JCMB) James Clerk Maxwell Building Peter Guthrie Tait Road Edinburgh EH9 3FD GB
Titanium alloys play an important role in many applications, particularly in the aerospace industry, combining high strength with low density. Pure titanium exhibit in three different phases, alpha beta and omega, and various alloying elements are used to stabilise the desired phase. However, a simple, consistent theory for single phase stability is less well established. Here, I have tackled this problem using electronic structure methods based on density functional theory with plane waves and pseudopotentials. I will present results on binary and ternary titanium alloys, showing that single phase stability can be related to the number of d-electrons, independent of the actual alloying elements used and their atomistic arrangement. This leads to a quantitative measure of phase-stabilisation for each alloying element, close to the valence.
This is a weekly series of informal talks given primarily by members of the soft condensed matter and statistical mechanics groups, but is also open to members of other groups and external visitors. The aim of the series is to promote discussion and learning of various topics at a level suitable to the broad background of the group. Everyone is welcome to attend..