PSI - Issue 68

Yuki Tampa et al. / Procedia Structural Integrity 68 (2025) 681–686

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Y. Tampa et al. / Structural Integrity Procedia 00 (2025) 000–000

4. Conclusions 1. The FC-O and FCV-O single-crystalline specimens exhibited moderate ductility with specimen bending under uniaxial tensile loading conditions, which is presumably associated with shear banding due to the activation of multiple slip systems. In the FCV-D single-crystalline specimen, a sudden stress drop occurred after the onset of yielding. At the same time, localised slip bands appeared with wavy slip lines. This suggests that disordering causes short-range order hardening followed by cross slipping. 2. The FC-O and FCV-O poly-crystalline specimens showed some plasticity before the brittle fracture. The addition of V increased the yield stress and fracture strength. It prevented the intergranular fracture and enhanced the plasticity. In the FCV alloy, disordering further increased the yield and tensile strength values, and the tensile strength for FCV-D was determined by the Considère criterion. 3. In the multi-grains specimens, the bamboo-structured FC-O specimen behaved like a single-crystalline specimen, whereas in the FCV-O specimen having multiple grains in its transverse direction, plastic constraint by the neighbouring grains caused cleavage fracture without specimen bending. Acknowledgements This work was partially supported by Next Generation Tatara Co-creation Project, sponsored by the Government of Japan and Shimane Prefecture. References A.M. Glezer, I.V. Maleyeva, Grain boundary fracture of ordered alloy FeCo, Phys. Met. Metall. 66 (1988) 174–176. K.R. Jordan, N.S. Stoloff, Plastic deformation and fracture in FeCo–2%V, Trans. Metal. Soc. AIME, 245 (1969) 2027–2034. D. Kishi, T. Mayama, Y. Mine, K. Takashima, Crystallographic study of plasticity and grain boundary separation in FeCo alloy using small single- and bi-crystalline specimens, Scr. Mater. 142 (2018) 1–5. https://doi.org/10.1016/j.scriptamat.2017.08.012. T. Sourmail, Near equiatomic FeCo alloys: Constitution, mechanical and magnetic properties, Prog. Mater. Sci. 50 (2005) 816–880. https://doi.org/10.1016/j.pmatsci.2005.04.001. J. H White, C. V Wahl, Workable magnetic compositions containing principally iron and cobalt, US patent, 1932, No 1862559. L. Zhao, I. Baker, E.P. George, Room Temperature Fracture of FeCo, MRS Online Proc. Library 288 (1992) 501–506. https://doi.org/10.1557/PROC-288-501. M. Yamaguchi, Y. Umakoshi, T. Yamane, Y. Minonishi, S. Morozumi, Slip systems in an Fe-54 At. % Co alloy, Scr. Metall. 16 (1982) 607–609. https://doi.org/10.1016/0036-9748(82)90280-0. E. P. George, A.N. Gubbi, I. Baker, L. Robertson, Mechanical properties of soft magnetic FeCo alloys, Mater. Sci. Eng. A 329–331 (2002) 325–333. https://doi.org/10.1016/S0921-5093(01)01594-5.