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Open AccessArticle

Texture and Differential Stress Development in W/Ni-Co Composite after Rotary Swaging

1
Nuclear Physics Institute of the CAS, Řež 130, 25068 Řež, Czech Republic
2
Faculty of Materials Science and Technology, VŠB-Technical University of Ostrava, 708 00 Ostrava, Czech Republic
3
ESS (European Spallation Source ERIC), SE-221 00 Lund, Sweden
*
Author to whom correspondence should be addressed.
Materials 2020, 13(12), 2869; https://doi.org/10.3390/ma13122869
Received: 12 May 2020 / Revised: 17 June 2020 / Accepted: 22 June 2020 / Published: 26 June 2020
(This article belongs to the Special Issue Structural Phenomena in Modern Metallic Materials)
Knowledge of texture and residual stresses in tungsten heavy pseudoalloys is substantial for the microstructure optimization. These characteristics were determined in cold and warm rotary swaged W/NiCo composite with help of neutron diffraction. The results were discussed in view of the observed microstructure and mechanical properties. The investigated bars consisted of tungsten agglomerates (bcc lattice) surrounded by NiCo-based matrix (fcc lattice). No preferential crystallographic orientation was found in the as-sintered bar. A strong texture was formed in both the tungsten agglomerates (<101> fiber texture parallel to the swaging axis) and in the NiCo-based matrix (<111> fiber texture) after rotary swaging. Although usually of double-fiber texture, the <001> fiber of the fcc structures was nearly missing in the matrix. Further, the cold-swaged bar exhibited substantially stronger texture for both phases which corresponds to the higher measured ultimate tensile strength. The residual stress differences were employed for characterization of the stress state of the bars. The largest residual stress difference (≈400 MPa) was found at the center of the bar deformed at room temperature. The hoop stresses were non-symmetrical with respect to the swaging axis, which was likely caused by the elliptical cross section of the as-sintered bar. View Full-Text
Keywords: tungsten heavy alloys; rotary swaging; neutron diffraction; residual stress; texture tungsten heavy alloys; rotary swaging; neutron diffraction; residual stress; texture
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MDPI and ACS Style

Strunz, P.; Kocich, R.; Canelo-Yubero, D.; Macháčková, A.; Beran, P.; Krátká, L. Texture and Differential Stress Development in W/Ni-Co Composite after Rotary Swaging. Materials 2020, 13, 2869.

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