Internal friction and evolution of ultrafine-grained structure during annealing of Grade-4 titanium subjected to severe plastic deformation

被引：17

作者：

Gunderov, D. V. ^{[1
,2
]}

Polyakov, A. V. ^{[2
]}

Sitdikov, V. D. ^{[2
]}

Churakova, A. A. ^{[1
,2
]}

Golovin, I. S. ^{[3
]}

机构：

[1] Russian Acad Sci, Ufa Sci Ctr, Inst Phys Mol & Crystals, Ufa 450054, Russia

[2] Ufa State Tech Univ Aviat, Ufa 450000, Russia

[3] Natl Univ Sci & Technol MISiS, Moscow 119049, Russia

来源：

PHYSICS OF METALS AND METALLOGRAPHY | 2013年 / 114卷 / 12期

关键词：

severe plastic deformation; ultrafine-grained structure; equal-channel angular pressing; Conform process; internal friction; transmission electron microscopy; X-ray diffraction analysis; mechanical properties;

D O I：

10.1134/S0031918X13120041

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

Electron microscopy, X-ray diffraction, tensile tests, and measurements of internal friction (IF) have been used to study the transformation of the structure and properties of commercial Grade-4 titanium subjected to deformation using equal-channel angular pressing combined with the Conform process (ECAP-Conform), drawing, and subsequent annealing. It has been found that the ECAP-CONFORM with drawing leads to a decrease in the grain size of titanium to about 150 nm. During annealing at 400A degrees C for 1 h, the growth of separate grains was observed; with an increase in the annealing temperature to 450A degrees C or higher, the growth of grains in the whole volume of a specimen occurred. It has been shown that titanium in the ultrafine-grained (UFG) state is characterized by an internal-friction peak at temperatures of 450-500A degrees C (under the selected measurement conditions), which results from the processes of recovery and recrystallization. During repeated heating, no such effect was observed. At higher temperatures, a thermally activated relaxation internal-friction peak was found, which appears to be a grain-boundary internal-friction peak.

引用

页码：1078 / 1085

页数：8

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