Development of materials and processing regimes for the enhancement of specific strength is a challenge for the aviation, aerospace and transportation industries. The paper analyzes the evolution of microstructural parameters and mechanical properties of the Al – 5
A multilayered hybrid Al1050/AZ31/Al1050 alloy was fabricated by cross-accumulative roll bonding (CARB) up to 5 cycles at 400 °C. Microstructure, anelastic, and mechanical properties were characterized using scanning electron microscopy (SEM), internal friction (IF) measurements, and tensile tests, respectively. The thickness of AZ31 layers of the initial sample gradually loses its continuity in the form of localized necking and fragmentation and reduces to less than 150 µm after the fifth cycle and, contrarily, that of the Al1050 layer increases. Hot CARB processing causes an enhanced formation of intermetallic compounds. For almost all the cycles, apart from N = 1, the ultimate tensile strength of the sandwich measured in the transverse direction is comparable to that of the rolling direction. A maximum value of 182 MPa is achieved after one cycle in the transverse direction and a ductility of 9
The influence of the deposition temperature of amorphous FeCoSiB films on the magnetoelectric properties of composite structures was studied. It was found that an increase in the synthesis temperature leads to a significant decrease in the magnetoelectric response and an increase in the coercive field of the films.
A study of the AlSi10Mg composite material with the addition of 5, 10, and 15 wt
The structure and optical properties of a crystal of the langasite family (La1–xNdx)3Ta0.5–yGa5.5+yO14 were studied. An accurate X-ray diffraction study of this crystal was performed in the temperature range of 85–450 K at a resolution of 1.36 Å–1. The distribution of cations over mixed crystallographic positions was determined by the anomalous scattering method, the formula was set as (La0.863(9)Nd0.137(9))3Ta0.483(4)Ga5.517(4)O14. The transmission and absorption spectra of the crystal were measured. The dispersion dependence of the rotation of the plane of polarization of light ρz during light propagation in the optical axis direction at T = 295 K is calculated from the experimental transmission spectra. The changes in the Δρz and Δn values of ρz and the refractive index no in the region of absorption bands in the wavelength range of 350–1000 nm were calculated using the Kramers–Kronig relations; the maximum values are found to be Δρz 3 deg/mm, Δn 0.6 × 10–4. The temperature dependences of the refractive indices and rotation of the plane of polarization of light in the directions parallel (ρz) and perpendicular (ρx) to the optical axis are calculated from the structural data. It is shown that the temperature evolution of the optical activity of crystals correlates with the experimentally detected anomalous expansion of the [Ta, Ga]O6 octahedron, located at the origin of the unit cell. This expansion also manifests itself in the abnormal thermal expansion along the cell c axis, observed below 120 K.
