Two Al–Sc-based alloys (Al–0.12Sc and Al–0.042Sc–0.009Yb, at.%) and their counterparts with Li additions (Al–2.9Li–0.11Sc and Al–5.53Li–0.048Sc–0.009Yb, at.%) are aged at 325 C. For both base alloys, the addition of Li results in greater peak hardness from incorporation of Li in the L12-structured a-Al3(Sc,Li) and a-Al3(Sc,Li,Yb) precipitates, and a concomitant increase in number density and vo...

The localized corrosion behavior of a galvanic aluminum copper couple was investigated by in situ fluorescence imaging with a fiber-optic imaging sensor. Three different, but complementary methods were used for visualizing remote corrosion sites, mapping the topography of the metal surface, and measuring local chemical concentrations of H+, OH-, and Al3+. The first method is based on a pH-sensi...

An alternative method for the determination of trace levels of fluoride in drinking and sea-water samples is presented. It is based on the formation of the aluminium monofluoride complex in excess of Al3+ and separation of the two species formed (AlF2+ and Al3+) in a small (5 cm long, CG2) ion exchange guard column. The final determination is accomplished by both ICP-MS specific detection and p...

Crop systems and fertilization sources can affect the chemical properties of the soil and, consequently, its fertility. With the aim of evaluating the effect of such management practices, soil samples collected at 0.0-0.10; 0.10-0.20; and 0.20-0.40 m in depth were collected and analyzed in the second year of an experiment installed in 2006 in a Rhodic Hapludox under no-till farming, located in ...

The microstructure of ternary Al3(Sc1-yREy) intermetallic compounds (where RE is one of the rare-earth elements La, Ce, Nd, Sm, Eu, Yb or Lu), was investigated as a function of RE concentration for 0<y≤0.75. Alloys with La, Ce, Nd, Sm or Eu additions consist of a L12 phase containing a dendritic second phase with D019 (La, Ce, Nd, Sm) or C11b (Eu) structure. Alloys with Yb or Lu additions show ...

To evaluate the feasibility of nickel–aluminum (the Ni2+:Al3+ molar ratios 1.0:1.0 and 1.0:2.0 are denoted as NA11 NA12, respectively) nickel–aluminum–zirconium type Ni2+:Al3+:Zr4+ 0.9:1.0:0.09 0.9:2.0:0.09 NAZ1 NAZ2, hydroxides for Cr(VI) removal from aqueous media, adsorption capability mechanism using above-mentioned adsorbents were investigated in this study. The quantity adsorbed onto NA11...

Nghiên cứu này báo cáo về tính chất quang xúc tác của vật liệu CeO2:4%Eu3+, x%Al3+ (x = 0, 2, 4, 6, 8) được tổng hợp bằng phương pháp đốt cháy. Đặc điểm cấu trúc, và hình thái các hạt nano xác định nhiễu xạ tia X, kính hiển vi điện tử quét phát trường, tán năng lượng X phổ phản xạ-khuếch UV-Vis. Phân tích giản đồ XRD cho thấy thu có trúc đơn pha với fluorite. Ảnh SEM dạng cầu kích thước trung b...