Cu-Al-Ni shape memory alloys are currently the only available high temperature SMA, showing a good resistance against functional fatigue. Primary task at the cooperaton in the frame of EUREKA programmes E!2982, E!3704 and E!3863 was/is the production of rapidly solidified thin ribbons on the base of Cur with corresponding geometry, surface quality, microstructure and mechanical properties. In the frame of our investigation the ribbons from the set of Cu-Al-Ni type alloys were produced. Mechanical properties of the ribbons produced from the alloy CuAl13Ni4 were improved by appending of B.
COBISS.SI-ID: 9607190818015
Electrical resistance is one of the most structural sensitive properties of the solids. For electrical resistance measurements we employed a four contact method. Purpose of production was to determine temperature intervals of microstructural changes and the kinetics of transformations from metastable into stable state in rapidly solidified ribbons. Thermal analysis with electric resistance measurements turns out to be indispensable tool for understanding phase transformations in rapidly solidified Cu and Al alloys.
COBISS.SI-ID: 639071767583
Ag alloys with Te, Se and S fulfil the conditions for the internal oxidation. Microstructure of these alloys consists of matrix and particles of intermetallic compounds. At the direct oxidation of the particles of the intermetallic compound the phenomena of the selective oxidation was observed. Concentration of more reactive elements is increasing in the oxidized part of the particles of the intermetallic compound (Te in AgTeSe). In the precipitated oxide particles the concentration of Se is more than twice higher than of Te.
COBISS.SI-ID: 5151675154235
Work deals with the influence of AlTi5B1 and AlTi3C0,15 grain refiners on the crystallisation of aluminium. AlTi5B1 is much more effective in suppressing the growth of the crystal grains than AlTi3C0,15 at the same additive content of titanium. The behaviour of both grain refiners is explained by the differences in the nucleation mechanisms. he papers deal also with the determination of orientation relationships between TiC particles and the surrounding aluminium matrix using TEM.
COBISS.SI-ID: 471903636586
In electrical engineering in order to protect and insulate electromagnetic sheet (ES), instead of lacquering, controlled preparation of iron okxide layers is becoming establish practice. We used a method for the determination of a oxide layer composition , which based on the use of reference samples with known composition. Reference samples used were magnetite and hematite. The relative sensitivity factor obtained were then used in quantitative calculation of the composition of the oxide layers deposited by sputtering, and in defining the composition of the oxide surfaces of the ES samples.
COBISS.SI-ID: 20544807
Cu-Al-Ni shape memory alloys are currently the only available high temperature SMA, showing a good resistance against functional fatigue. Primary task at the cooperaton in the frame of EUREKA programmes E!2982, E!3704 and E!3863 was/is the production of rapidly solidified thin ribbons on the base of Cur with corresponding geometry, surface quality, microstructure and mechanical properties. In the frame of our investigation the ribbons from the set of Cu-Al-Ni type alloys were produced. Mechanical properties of the ribbons produced from the alloy CuAl13Ni4 were improved by appending of B.
Ag alloys with Te, Se and S fulfil the conditions for the internal oxidation. Microstructure of these alloys consists of matrix and particles of intermetallic compounds. At the direct oxidation of the particles of the intermetallic compound the phenomena of the selective oxidation was observed. Concentration of more reactive elements is increasing in the oxidized part of the particles of the intermetallic compound (Te in AgTeSe). In the precipitated oxide particles the concentration of Se is more than twice higher than of Te.
Electrical resistance is one of the most structural sensitive properties of the solids. For electrical resistance measurements we employed a four contact method. Purpose of production was to determine temperature intervals of microstructural changes and the kinetics of transformations from metastable into stable state in rapidly solidified ribbons. Thermal analysis with electric resistance measurements turns out to be indispensable tool for understanding phase transformations in rapidly solidified Cu and Al alloys.
Work deals with the influence of AlTi5B1 and AlTi3C0,15 grain refiners on the crystallisation of aluminium. AlTi5B1 is much more effective in suppressing the growth of the crystal grains than AlTi3C0,15 at the same additive content of titanium. The behaviour of both grain refiners is explained by the differences in the nucleation mechanisms. he papers deal also with the determination of orientation relationships between TiC particles and the surrounding aluminium matrix using TEM.