Twin boundary: Controllable interface to fatigue cracking.

doi:10.1016/j.jmst.2017.03.022

Abstract

Abstract:

Twin boundaries (TBs) are key factors influencing the mechanical properties of crystalline materials. We have investigated the intrinsic fatigue cracking mechanisms of TBs during the past decade. The effects of TB orientations on the fatigue cracking mechanisms were revealed via cyclic deformation of a series of grown Cu bicrystals with a sole TB. Furthermore, the combined effects of crystallographic orientation and stacking fault energy (SFE) on the fatigue cracking mechanisms were clarified through cyclic deformation of polycrystalline Cu and Cu alloys. Both developments were reviewed in this report which will provide implications to optimize the interfacial design for the improvement of fatigue performance of metallic materials.

Key words: Fatigue cracking, Twin boundary, Stacking fault energy, Orientation.

Zhang Zhefeng, Li Linlin, Zhang Zhenjun, Zhang Peng. Twin boundary: Controllable interface to fatigue cracking.[J]. J. Mater. Sci. Technol., 2017, 33(7): 603-606.

Figures/Tables 3

Fig. 1. Fatigue cracking behaviors, primary slip systems change with the angle between the CTB plane and the loading direction.

Fig. 2. (a) Fatigue cracking behavior and (b) the primary slip systems when the ITB is inclined at 45° to the loading direction; (c) fatigue cracking behavior and (d) the primary slip systems when the special HAGB is inclined at 45° to the loading direction; (e) fatigue cracking behavior and (f) the primary slip systems when the ITB is perpendicular to the loading direction.

Fig. 3. Influences of SFE and crystallographic orientation on the fatigue cracking modes along TBs or SBs: (A) Cu; (B) Cu-10 at.% Zn; (C) Cu-5 at.% Al; (D) Cu-8 at.% Al; (E) Cu-32 at.% Zn; (F) Cu-16 at.% Al.

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