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Articles by Simon Fellner
Influence of Severe Plastic Deformation on the Magnetic Properties of Sm‐Co Permanent Magnets
High pressure torsion (HPT) is presented as a new fabrication route to produce bulk Sm-Co magnets with a strongly refined microstructure down to the nanometer regime. The initial powders, based on the compositions SmCo5, Sm2Co7 and Sm2Co17, are compacted and subsequently deformed by HPT. The microstructural evolution in dependence on the applied deformation parameters is characterized by electron microscopy and the effect of HPT on the phase stability is monitored by synchrotron X-ray diffraction.
Influence of Severe Plastic Deformation on the Magnetic Properties of Sm-Co Permanent Magnets
Conflict of Interest The authors declare no conflict of interest. Supporting Information Filename Description adem202400253-sup-0001-SuppData-S1.pdf21.4 KB Supplementary Material References 1 , Chin. Phys. B 2019, 28, 017501. 2 , , , , , , , , , , , , JOM 2022, 74, 1279. 3 , J. Magn. Magn. Mater. 1999, 200, 373. 4 , Acta Mater. 2003, 51, 5907. 5 , , , , , , Adv. Mater. 2011, 23, 821. 6 , , , , , , , Front. Mater. Sci. 2012, 6, 207. 7 , Materials 2022, 15, 6506. 8 , , , , Mater. Sci. Eng. B 2013, 178, 971.
Large mechanical properties enhancement in ceramics through vacancy-mediated unit cell disturbance - Nature Communications
Abstract Tailoring vacancies is a feasible way to improve the mechanical properties of ceramics. However, high concentrations of vacancies usually compromise the strength (or hardness). We show that a high elasticity and flexural strength could be achieved simultaneously using a nitride superlattice architecture with disordered anion vacancies up to 50%. Enhanced mechanical properties primarily result from a distinctive deformation mechanism in superlattice ceramics, i.e., unit-cell disturbances.
Rejuvenation engineering in metallic glasses by complementary stress and structure modulation - NPG Asia Materials
Abstract Residual stress engineering is widely used in the design of new advanced lightweight materials. For metallic glasses, attention has been given to structural changes and rejuvenation processes. High-energy scanning X-ray diffraction strain mapping reveals large elastic fluctuations in notched metallic glasses after deformation under triaxial compression.
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