Cyclic deformation response of ultra-fine grained titanium at elevated temperatures

Name: Cyclic deformation response of ultra-fine grained titanium at elevated temperatures
Author: Sajadifar, Seyed Vahid, Yapıcı, Güney Güven, Demler, E., Krooss, P., Wegener, T., Maier, H. J., Niendorf, T.

İsim	Cyclic deformation response of ultra-fine grained titanium at elevated temperatures
Yazar	Sajadifar, Seyed Vahid, Yapıcı, Güney Güven, Demler, E., Krooss, P., Wegener, T., Maier, H. J., Niendorf, T.
Basım Tarihi:	2019-05
Basım Yeri	- Elsevier
Konu	Titanium, Ultra-fine grained, Severe plastic deformation, Fatigue, Cyclic stability, High temperature
Tür	Süreli Yayın
Dil	İngilizce
Dijital	Evet
Yazma	Hayır
Kütüphane:	Özyeğin Üniversitesi
Demirbaş Numarası	0142-1123
Kayıt Numarası	b2fbc81b-3255-44ff-8977-118939f9162b
Lokasyon	Mechanical Engineering
Tarih	2019-05
Notlar	EU-FP7 Marie Curie Career Integration Grant ; Hessen State Ministry of Higher Education, Research and the Arts - Initiative for the Development of Scientific and Economic Excellence (LOEWE)
Örnek Metin	This study focuses on the high-temperature cyclic deformation response (CDR) of ultra-fine grained (UFG) titanium of commercial purity (grade 4) processed via equal channel angular extrusion as a severe plastic deformation method. Low-cycle fatigue experiments were conducted at elevated temperatures up to 600 degrees C and at strain amplitudes ranging from 0.2% to 0.6%. Besides temperature and strain amplitude, the influence of two processing routes (8B(C) and 8E) on the fatigue characteristics of UFG Ti was examined. It is clearly revealed that the CDR of UFG Ti is not strongly affected by the alteration of strain path during ECAE processing, as long as highly efficient routes are employed. Both routes lead to high volume fraction of high angle grain boundaries and improved fatigue performance up to 400 degrees C is demonstrated. Electron backscatter diffraction assisted microstructural characterization was used to analyze elementary degradation mechanisms affecting cyclic mechanical behavior. Micrographs reveal the occurrence of severe recrystallization and grain growth only at temperatures above 400 degrees C and, thus, grade 4 UFG Ti is characterized by unprecedented cyclic stability in comparison to other UFG alloys.
DOI	10.1016/j.ijfatigue.2019.01.021
Cilt	122

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Cyclic deformation response of ultra-fine grained titanium at elevated temperatures

Yazar Sajadifar, Seyed Vahid, Yapıcı, Güney Güven, Demler, E., Krooss, P., Wegener, T., Maier, H. J., Niendorf, T.

Basım Tarihi 2019-05

Basım Yeri - Elsevier

Konu Titanium, Ultra-fine grained, Severe plastic deformation, Fatigue, Cyclic stability, High temperature

Tür Süreli Yayın

Dil İngilizce

Dijital Evet

Yazma Hayır

Kütüphane Özyeğin Üniversitesi

Demirbaş Numarası 0142-1123

Kayıt Numarası b2fbc81b-3255-44ff-8977-118939f9162b

Lokasyon Mechanical Engineering

Tarih 2019-05

Notlar EU-FP7 Marie Curie Career Integration Grant ; Hessen State Ministry of Higher Education, Research and the Arts - Initiative for the Development of Scientific and Economic Excellence (LOEWE)

Örnek Metin This study focuses on the high-temperature cyclic deformation response (CDR) of ultra-fine grained (UFG) titanium of commercial purity (grade 4) processed via equal channel angular extrusion as a severe plastic deformation method. Low-cycle fatigue experiments were conducted at elevated temperatures up to 600 degrees C and at strain amplitudes ranging from 0.2% to 0.6%. Besides temperature and strain amplitude, the influence of two processing routes (8B(C) and 8E) on the fatigue characteristics of UFG Ti was examined. It is clearly revealed that the CDR of UFG Ti is not strongly affected by the alteration of strain path during ECAE processing, as long as highly efficient routes are employed. Both routes lead to high volume fraction of high angle grain boundaries and improved fatigue performance up to 400 degrees C is demonstrated. Electron backscatter diffraction assisted microstructural characterization was used to analyze elementary degradation mechanisms affecting cyclic mechanical behavior. Micrographs reveal the occurrence of severe recrystallization and grain growth only at temperatures above 400 degrees C and, thus, grade 4 UFG Ti is characterized by unprecedented cyclic stability in comparison to other UFG alloys.

DOI 10.1016/j.ijfatigue.2019.01.021

Cilt 122