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Thermal Stability Study of Vacancy‐Type Defects in Commercial Pure Titanium Using Positron Annihilation Spectroscopy
Author(s) -
DomínguezReyes Ricardo,
Savoini Begoña,
Monge Miguel Ángel,
Muñoz Ángel,
Ballesteros Carmen
Publication year - 2017
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201500649
Subject(s) - materials science , positron annihilation spectroscopy , vacancy defect , titanium , impurity , positron , spectroscopy , positron lifetime spectroscopy , thermal stability , positron annihilation , analytical chemistry (journal) , crystallography , metallurgy , nuclear physics , chemical engineering , chemistry , physics , organic chemistry , chromatography , quantum mechanics , engineering , electron
Commercially pure (CP) titanium has been subjected to hydrostatic extrusion at room temperature at true strains ranging from 0.70 to 3.24. Isochronal thermal treatments, from room temperature to 1 200 °C, have been performed and the thermal stability of the deformation‐induced defects has been studied by positron annihilation spectroscopy (PAS). In non‐annealed samples, vacancy‐type defects are formed and interact with iron impurities. These defects are not stable near room temperature. Saturation of the positron annihilation parameters is not observed for cumulative true strains as large as 3.24, due to dynamic recovery during the extrusion process. TEM experiments confirm the formation of iron‐rich precipitates. Vacancy‐type defects and vacancy–impurity complexes anneal out at temperatures ≈700 °C.