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- W2567467590 abstract "It's widely believed that slip, and deformation twin that resulted from stacking faults (SF) are two principal plastic deformation models in hexagonal close packed (HCP) materials. Although SF play an important role in the plastic deformation of HCP metals [ 1-2 ].However, few of studies were carried out on the interaction between the dislocations and SF during the deformation, this makes the mechanisms of interaction between the dislocations and SF is no clear. Therefore, further investigations, such as in situ transmission electron microscopy (TEM) observation, are important for our understanding the deformation mechanism of HCP metals. In this paper, in situ TEM techniques are used to investigate the plastic deformation mechanisms of cobalt. The tensile tests is carried on the single crystal cobalt pillar with diameters of ∼200 nm, the long axis is parallel to [10 1 0] direction. In the initial stage of deformation, a large number of dislocations are generating and moving during loading. TEM images reveal that the type of dislocation is pyramidal I, which is consistent with the Schmidt factor principle. As the strain increasing, the density of dislocation increased and interacted with SF, then tangled together. This process lead to the homogenous elongation is 10.8%, then followed by necking. The observed plastic strain is obviously larger than the bulk and nanocrystalline cobalt [ 3 ]. This indicated the interaction between the pyramidal I dislocation and SF can improve the ductility of single crystal cobalt. This result of study is important for understanding the plastic behaviors of the small sized HCP metals." @default.
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- W2567467590 date "2015-11-01" @default.
- W2567467590 modified "2023-09-28" @default.
- W2567467590 title "B12-P-07In situinvestigate the plastic deformation behavior of small-size Cobalt" @default.
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- W2567467590 doi "https://doi.org/10.1093/jmicro/dfv227" @default.
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