RESUMO
AA7075 aluminum alloy is widely used for several high-technology applications for its high mechanical strength to weight ratio but is still the subject of several studies seeking a further increase in its mechanical properties. A commercial powder is used, either as-received or after ball-milling. Dense AA7075 samples are prepared in one step by Spark Plasma Sintering, at 550 °C with a holding time of 15 min and a uniaxial pressure of 100 MPa. No additional heat treatment is performed. Laser granulometry, X-ray diffraction and optical- and scanning electron microscopy show that both grain size and morphology are preserved in the dense samples, due to the relatively low temperature and short sintering time used. The samples prepared using the ball-milled powder exhibit both higher Vickers microhardness and transverse fracture strength values than those prepared using the raw powder, reflecting the finer microstructure.
RESUMO
Piassava (Attalea funifera), a palm tree endemic to Bahia, has a very flexible and resistant fiber. This data article aims to assess the effect of piassava fibers in polyester matrix on the mechanical properties of composites. Two composites were manufactured, one of the piassava fibers in polyester matrix and the other a hybrid of piassava and E-glass fibers in polyester matrix, by hot compression molding process, on which uniaxial tensile tests and three-point bending tests were later performed. The results so obtained show the effective contribution of piassava fibers as reinforcement in polymeric composites. This data article is related to "Effects of hybridization on the mechanical properties of composites reinforced by piassava fibers tissue" (de Oliveira Filho et al., 2018).