日本金属学会誌

J. Japan Inst. Met. Mater, Vol. 82, No. 09 (2018),
pp. 358-365

Orientation Dependence on Fatigue Fracture Behavior in Uniaxial Fatigue Tests of Pure Mg Single Crystals

Yuta Kido 1, Akinobu Nakamura 1, Seiya Tsunoda 1, Masayuki Tsushida 2, Hiromoto Kitahara 3 and Shinji Ando 4

1 Graduate School of Science and Technology, Kumamoto University
2 Faculty of Engineering, Kumamoto University
3 Institute of Pulsed Power Science, Kumamoto University
4 Magnesium Research Center, Kumamoto University

Abstract:

Three Mg single crystalline round-bar specimens with different crystal orientations were subjected to uniaxial tension-compression fatigue tests, and the crystal orientation dependence on fatigue fracture behavior was investigated. The loading direction of AD, BC and EF specimens was [1120], [1100] and [0001] respectively. At stress amplitude(σa) over 60 MPa, fatigue life of BC specimen was longest and fatigue life of EF specimen was shortest. When the stress amplitude was 20 MPa, fatigue lives of all specimens were almost the same. Our study suggested that fatigue life in Mg single crystals show high dependence of crystal orientation and stress.

[doi:10.2320/jinstmet.J2018019]


(Received 2018/04/02)

Keywords:

S-N plot, fatigue life, fracture surface, basal slip, twin, crack, second order pyramidal slip, void


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