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- W3196183646 abstract "The tensile deformation behavior and microstructure evolution of gradient structured (GS) Ni processed by severe torsion deformation (STD) were systematically investigated. The results show that the gradient shear strain from STD introduces gradient distributions of grain size, microhardness, frequency of low angle grain boundaries, Σ3 twins and geometrically necessary dislocations (GND) density along the radial direction. With the increasing torsional angle of STD, the yield strength and ultimate tensile strength increase correspondingly while the uniform elongation first decreases and then increases. When the torsional angle increases to a maximum torsional revolution of 16, this specific GS Ni undergoes a maximum shear strain and lead to a promoted strength-ductility synergy, showing yield strength of 592 MPa, ultimate tensile strength of 1019 MPa and uniform elongation of 8.58%, as well as the highest work hardening rate. The simultaneous improvement of mechanical property is due to the strong partitioning between the fine grain region and central coarse grain region, which induces a significant work-hardening at the early plastic deformation stage. Therefore, a high shear strain and delicate control of its gradient in STD can lead to a unique gradient structure in metals, which is a good strategy to improve the mechanical properties of rod products." @default.
- W3196183646 created "2021-08-30" @default.
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- W3196183646 date "2021-10-01" @default.
- W3196183646 modified "2023-10-12" @default.
- W3196183646 title "Improvement of strength and ductility in a gradient structured Ni fabricated by severe torsion deformation" @default.
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- W3196183646 doi "https://doi.org/10.1016/j.msea.2021.141980" @default.
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