کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5015277 1463726 2017 55 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Cyclic deformation and microstructure evolution of high Nb containing TiAl alloy during high temperature low cycle fatigue
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی مکانیک
پیش نمایش صفحه اول مقاله
Cyclic deformation and microstructure evolution of high Nb containing TiAl alloy during high temperature low cycle fatigue
چکیده انگلیسی
The cyclic stress-strain (CSS) behavior of high Nb containing TiAl alloy with a duplex microstructure was investigated at 850 °C. Transmission electron microscope (TEM) observations and electron backscattered diffraction (EBSD) techniques were carried out to obtain insight into the microstructure evolution governing this behavior. At low strain amplitude, the material exhibits a rapid saturation of stress amplitude. At intermediate and high strain amplitude, the CSS behavior is characterized by generally cyclic softening. The changes of microstructure are strain-induced phase transformations and dynamic recrystallization, which lead to a degradation of lamellar microstructure. Twin boundaries can promote discontinuous dynamic recrystallization of γ phase, for processing relatively high energy. α2 + γ → B2, α2 → B2, and α2lamellae → γ phase transformations are detrimental to fatigue life of the material, because fracture propagation are usually along B2 phase boundaries and γ grain boundaries, thus, the fracture mode is a combination of ductile fracture and intergranular cleavage fracture.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Fatigue - Volume 99, Part 1, June 2017, Pages 68-77
نویسندگان
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