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Thermal analysis of precipitation reactions in a Ti–25Nb–3Mo–3Zr–2Sn alloy
Journal article   Peer reviewed

Thermal analysis of precipitation reactions in a Ti–25Nb–3Mo–3Zr–2Sn alloy

Damon Kent, Steven Pas, Suming Zhu, Gui Wang and Matthew S Dargusch
Applied Physics A, Vol.107(4), pp.835-841
2012
DOI: https://doi.org/10.1007/s00339-012-6778-9
url
https://doi.org/10.1007/s00339-012-6778-9View
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Abstract

Condensed Matter Physics Materials Engineering Optical Physics
A study was undertaken on a Ti-25Nb-3Mo-3Zr-2Sn alloy using differential scanning calorimetry (DSC) in order to improve understanding of the precipitation reactions occurring during aging heat treatments. The investigation showed that isothermal ω phase can be formed in the cast and solution treated alloy at low aging temperatures. An exothermic peak in the temperature range of 300 to 400°C was detected for precipitation of the ω phase, with approximate activation energy of 176 kJ/mol. The ω phase begins to dissolve at temperatures around 400°C and precipitation of the α phase is favoured at higher temperatures between 400°C and 600°C. An exothermic peak with activation energy of 197 kJ/mol was measured for precipitation of the α phase. Deformation resulting in the formation of the stress induced α″ phase altered the DSC heating profile for the solution treated alloy. The exothermic peak associated with precipitation of the ω phase was not detected during heating of the deformed material and increased endothermic heating associated with recovery and recrystallisation was observed.

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