TY - JOUR
T1 - Crystallographic selection rule for the propagation mode of microstructurally small fatigue crack in a laminated Ti-6Al-4V alloy
T2 - Roles of basal and pyramidal slips
AU - Maenosono, Akira
AU - Koyama, Motomichi
AU - Tanaka, Yoshihisa
AU - Ri, Shien
AU - Wang, Qinghua
AU - Noguchi, Hiroshi
N1 - Funding Information:
This study was supported by the Cross-ministerial Strategic Innovation Promotion Program (Structural Materials for Innovation) and JSPS KAKENHI ( JP16H06365 ). MK acknowledges Assoc. Prof. Goro Miyamoto at Tohoku University for support with the heat treatment studies.
Publisher Copyright:
© 2019 Elsevier Ltd
PY - 2019/11
Y1 - 2019/11
N2 - We investigated the microstructurally small fatigue crack growth (FCG) in a fully laminated Ti-6Al-4V alloy. Basal slip only causes Mode II FCG, which is the predominant FCG mechanism in the present alloy. However, when the basal plane was aligned approximately parallel to the notch/crack surface, Mode I or II FCG was activated by pyramidal slip. When a single pyramidal slip system was activated, Mode II FCG on the pyramidal slip also occurred. The shear stress on the basal plane strongly depends on the geometrical relationship between the basal plane and the notch/crack alignment, which caused scatter in the fatigue life.
AB - We investigated the microstructurally small fatigue crack growth (FCG) in a fully laminated Ti-6Al-4V alloy. Basal slip only causes Mode II FCG, which is the predominant FCG mechanism in the present alloy. However, when the basal plane was aligned approximately parallel to the notch/crack surface, Mode I or II FCG was activated by pyramidal slip. When a single pyramidal slip system was activated, Mode II FCG on the pyramidal slip also occurred. The shear stress on the basal plane strongly depends on the geometrical relationship between the basal plane and the notch/crack alignment, which caused scatter in the fatigue life.
KW - Crystallography
KW - Electron microscopy
KW - Microstructurally small fatigue crack
KW - Strain measurements
KW - Titanium alloys
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U2 - 10.1016/j.ijfatigue.2019.105200
DO - 10.1016/j.ijfatigue.2019.105200
M3 - Article
AN - SCOPUS:85069594579
SN - 0142-1123
VL - 128
JO - International Journal of Fatigue
JF - International Journal of Fatigue
M1 - 105200
ER -