Impact Toughness of Ultrafine-Grained Commercially Pure Titanium for Medical Application

Alexander Vadimovich Polyakov, Irina Petrovna Semenova, Elena Vladimirovna Bobruk, Seung Mi Baek, Hyoung Seop Kim, Ruslan Zufarovich Valiev

Результат исследований: Научные публикации в периодических изданияхстатья

6 Цитирования (Scopus)

Аннотация

This study aims at achieving the best combination of strength, ductility, and impact toughness in ultrafine-grained (UFG) Ti Grade 4 produced by equal-channel angular pressing via Conform scheme (ECAP-C) with subsequent cold drawing. UFG structures with various parameters (e.g., size and shape of grains, dislocation density, conditions of boundaries) are formed by varying the treatment procedures (deformation temperature and speed at drawing, annealing temperature). The tensile and impact toughness tests were performed on samples with a V-shaped notch and different structures of commercially pure Ti Grade 4 in the coarse-grained and UFG states. The results demonstrated that grain refinement, higher dislocation density, and their elongated shape were obtained as a result of drawing at 200°S(cyrillic), which led to a decrease in both the uniform elongation at tension and the impact toughness of Ti Grade 4. Short-term annealing at 400-450°C could improve the impact toughness of UFG Ti with a non-significant decrease in strength. This short-term annealing contributes to the dislocation density decrease without considerable grain growth as a result of the recovery and redistribution of dislocations. The dependence of impact toughness on the strain hardening ability of UFG Ti was discussed.

Язык оригиналаанглийский
Номер статьи1700863
Число страниц9
ЖурналAdvanced Engineering Materials
Том20
Номер выпуска5
Ранняя дата в режиме онлайн2018
DOI
СостояниеОпубликовано - мая 2018
Опубликовано для внешнего пользованияДа

Предметные области Scopus

  • Физика конденсатов
  • Материаловедение (все)

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