Search

Consolidated nano/sub-micron AZ31 Mg alloy is a new structural material that combines nano-scale grains with a size of up to 100 nm and sub-micron grains with a size of up to 300 nm. Inherently, this new material should have significantly improved strength, making it a potential candidate for special applications requiring increased specific strength. The present paper evaluates the properties of nano/sub-micron AZ31 Mg alloy in terms of mechanical properties and corrosion resistance. The obtained properties are explained and associated with the micro-structure of the alloy. In addition, the nano/sub-micron structural alloy was compared to conventional extruded alloy with the same composition in order to distinguish the main differences between the two alloys. [ABSTRACT FROM AUTHOR]

Hydroxyapatite (HA) was coated onto titanium substrates using radio frequency sputtering, and the as-sputtered films were placed under hydrothermal conditions in distilled water solutions at pH 5.0, 7.0 and 9.0 and 110°C. The crystallinity, the Ca/P ratio, thickness, and the surface of the films were observed using XRD, EDS, and SEM, respectively. The as-sputtered film was crystallized in distilled water at varying pH after the hydrothermal treatment, and the crystallinity of the film increased with treatment time. The HA crystal size increased with pH. At pH 5.0, β-TCP was produced as well as HA. The Ca/P ratio of the film decreased with increasing treatment, and the ratio at pH 9.0 was 1.74 after 48 h, while in pH 5.0 and 7.0 it was 1.63. After hydrothermal treatment, the film remnant ratio increased with pH, with 75.9, 82.4 and 91.7% of the film remaining after 48 h at pH 5.0, 7.0 and 9.0, respectively. [ABSTRACT FROM AUTHOR]