The high-pressure torsion processing technique was used to consolidate and process magnesium-based chips. Chips were prepared by machining commercially pure magnesium and a magnesium alloy AZ91 separately. Optical microscopy and microhardness measurements showed good consolidation of pure magnesium. The magnesium alloy continued to exhibit the boundaries between the chips even after 5 turns of HPT suggesting poor bonding. The results show that soft chips are easier to consolidate through HPT than harder alloys.

Polystyrene-b-poly­(ethylene-co-butylene)-b-polystyrene-grafted maleic anhydride (SEBS-MA), a highly available block copolymer (BCP), was employed as a template to selectively guide the incorporation of aluminosilicate nanoparticles (NPs). To this end, hybrids with different amounts of sol–gel NPs in SEBS-MA were prepared by solvent casting. Results indicated that NPs could react with maleic anhydride-derived species in SEBS-MA to lead to cross-links in the EB block. Furthermore, the incorporation of NPs up to 15 wt % led to hybrids with enhanced strength and strain at break. In situ SAXS analysis during stretching showed that the lamellar phase was severely damaged upon stretching. Moreover, high contents of NPs led to morphologies with coarse particles ejected from the BCP lamellar structure. The overall result indicates that highly available BCP elastomers can be used as a platform for the design of hybrids with well-distributed NPs and enhanced properties useful for wearables.

ResumoAs mudanças que ocorrem ao longo do recozimento na microestrutura e textura foram observadas no aço inoxidável ferrítico estabilizado ao nióbio, tipo ASTM 430 por meio de Difração de Elétrons Retroespalhados. As amostras deformadas foram recozidas com uma taxa de aquecimento de 23,5°C/s. O recozimento foi interrompido nas temperaturas de 780, 830 e 880°C para acompanhar a evolução da microestrutura e textura. Os resultados mostraram que a nucleação dos novos grãos ocorre preferencialmente nos contornos de alto ângulo. No estágio inicial da recristalização a fibra γ é dominante na fração recristalizada, com as componentes 111 12 1 , 111 1 1 2 mais intensas. Na fração não recristalizada a fibra α foi mais intensa. No progresso da recristalização as componentes 111 12 1 e 111 1 1 2 permanecem predominantes, a fibra γ torna-se dominante em detrimento da fibra α. Palavras-chave: Aço inoxidável ferrítico; Recristalização; Textura. STUDY OF THE RECRYSTALLIZATION A NIOBIUM STABILIZED FERRITIC STAINLESS STEEL AbstractThe changes that occur during the annealing on the microstructure and texture were observed in the niobium stabilized ferritic stainless steel, type ASTM 430 by Electron Backscattered Diffraction. The cold rolled samples were annealed with at a heating rate of 23.5°C/s. The annealing was interrupted at 780, 830 and 880°C to verify the microstructure and texture evolution. The results showed that the nucleation of new grains occurs preferentially in the prior high-angle boundaries. In the early stage of recrystallization, the γ-fiber is dominant in the recrystallized fraction with high intensity in 111 12 1 and 111 1 1 2 . In the no-recrystallized fraction the α-fiber was more intense. In the progress of the recrystallization, the orientation 111 12 1 and remain prevalent and the γ-fiber becomes dominant rather than the α-fiber.