کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7981154 1514743 2014 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Flow behavior and deformation mechanism in the isothermal compression of the TC8 titanium alloy
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
Flow behavior and deformation mechanism in the isothermal compression of the TC8 titanium alloy
چکیده انگلیسی
The TC8 titanium alloy was isothermally compressed at the deformation temperatures ranging from 820 °C to 980 °C, strain rates of 10 s−1, 30 s−1 and 50 s−1, and a height reduction of 60%. An optical microscope (OM) and a transmission electron microscope (TEM) were used to examine the microstructure. The flow stress decreases with the increasing of deformation temperature and decreasing of strain rate. The strain rate sensitivity exponent m increases gradually to a maximum value as the deformation temperature increases from 820 °C to 940 °C, and then decreases at the deformation temperature of 980 °C. The strain hardening exponent n decreases with the decreasing of deformation temperature, and gets a maximum value at the strain rate of 30 s−1 and a given deformation temperature. According to the microstructure examination, the variation of flow stress, m and n values are found to depend on the phase transformation, grain morphology, dislocation content, dynamic recovery (DRV) and dynamic recrystallization (DRX) of primary α and β phases. The apparent activation energy for deformation is 429.766±80.394-383.478±78.734 kJ mol−1, and indicates that the dislocation climbing is not the main deformation mechanism. This deduction agrees well with the microstructure examination which shows that the DRX of primary α phase and β phase play an important role in the isothermal compression of TC8 titanium alloy.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 600, 10 April 2014, Pages 122-128
نویسندگان
, ,