Density studies of liquid alloys Sn-Ag and Sn-Zn with near eutectic compositions

The authors gratefully acknowledge the financial support of the Russian Foundation for Basic Research under the contract 10-03-96043. This work was also supported by the projects VEGA 2/0111/11, APVV-0413-06, APVV-0647/10 and by the Centre of Excellence SAS FUN-MAT. This research contributes to the European COST Action MP0602 on Advanced Solder Materials for High Temperature Applications.The density values for Sn - Ag and Sn - Zn alloys with near eutectic compositions were determined by the gamma-absorption method both in the liquid and solid states. Sn-rich melts of the Ag-Sn system were found to be microheterogeneous, whereas Sn-Zn melts demonstrate the behavior typical for true solutions. (C) 2012 Elsevier B.V. All rights reserved

Density studies of liquid alloys Sn-Ag and Sn-Zn with near eutectic compositions

The authors gratefully acknowledge the financial support of the Russian Foundation for Basic Research under the contract 10-03-96043. This work was also supported by the projects VEGA 2/0111/11, APVV-0413-06, APVV-0647/10 and by the Centre of Excellence SAS FUN-MAT. This research contributes to the European COST Action MP0602 on Advanced Solder Materials for High Temperature Applications.The density values for Sn - Ag and Sn - Zn alloys with near eutectic compositions were determined by the gamma-absorption method both in the liquid and solid states. Sn-rich melts of the Ag-Sn system were found to be microheterogeneous, whereas Sn-Zn melts demonstrate the behavior typical for true solutions. (C) 2012 Elsevier B.V. All rights reserved

The Influence of Ga Additions on Electric and Magnetic Properties of Co47Fe21B21Si5Nb6 Alloy in Crystal and Liquid States

The influence of small additions of gallium on electric resistivity and magnetic susceptibility of the bulk glass forming Co47Fe20.9B21.2Si4.6Nb6.3 alloy was studied in a wide temperature range up to 1830 K. Gallium atoms were found to increase resistivity but decrease susceptibility of the alloy. The suppositions about clusters surrounding Ga atoms in the melt and new GFA criterion are give

Microstructure and magnetism of Co2FeAl Heusler alloy prepared by arc and induction melting compared with planar flow casting

This paper is devoted to investigations of the structural and magnetic properties of the Co2FeAl Heusler alloy produced by three technologies. The alloys prepared by arc and induction melting have resulted in coarse-grained samples in contrast to the fine-grained ribbon-type sample prepared by planar flow casting. Scanning electron microscopy completed by energy dispersive X-ray spectroscopy, X-ray diffraction, Mössbauer spectroscopy, and magnetic methods sensitive to both bulk and surface were applied. The chemical composition was slightly different from the nominal only for the ribbon sample. From the viewpoint of magnetic properties, the bulk coercivity and remnant magnetization have followed the structure influenced by the technology used. Saturation magnetization was practically the same for samples prepared by arc and induction melting, whereas the magnetization of ribbon is slightly lower due to a higher Al content at the expense of iron and cobalt. The surface magnetic properties were markedly influenced by anisotropy, grain size, and surface roughness of the samples. The surface roughness and brittleness of the ribbon-type sample did not make domain structure observation possible. The other two samples could be well polished and their highly smooth surface has enabled domain structure visualization by both magneto-optical Kerr microscopy and magnetic force microscopy

Magnetic properties and crystallization behavior of Al-Co-Ce(Dy) amorphous ribbons

The work is partially supported by Ministry of Education and Science of the Russian Federation (Project no. 4.1177.2014/K) and by the Government of Sverdlovsk Region and RFBR (Project no, 13-03-96055).Magnetic and electric properties as well as the structure (by Vrays) and DSC of Al91Co2Ce7 and Al89Co5Dy6 alloys in amorphous and crystalline states are studied. For both ribbons crystallization goes into two stages. In case of Al91Co2Ce7 composition it starts with the formation of Al nanoparticles; after that Al11Ce3 and Al9Co2 compounds appear. For Al89Co5Dy6 ribbon the situation is vice versa - the crystallization of Al3Dy compound Lakes place at the first stage vvhereas crystallization of aluminum matrix arises at the second stage only. The effective magnetic moments per Cc (Dy) atoms were found to be smaller than for R3+ ions suggesting that rare-earth atoms create directed bonds with aluminum atoms. (C) 2015 Elsevier B.V. All rights reserved

Magnetic properties and crystallization behavior of Al-Co-Ce(Dy) amorphous ribbons

The work is partially supported by Ministry of Education and Science of the Russian Federation (Project no. 4.1177.2014/K) and by the Government of Sverdlovsk Region and RFBR (Project no, 13-03-96055).Magnetic and electric properties as well as the structure (by Vrays) and DSC of Al91Co2Ce7 and Al89Co5Dy6 alloys in amorphous and crystalline states are studied. For both ribbons crystallization goes into two stages. In case of Al91Co2Ce7 composition it starts with the formation of Al nanoparticles; after that Al11Ce3 and Al9Co2 compounds appear. For Al89Co5Dy6 ribbon the situation is vice versa - the crystallization of Al3Dy compound Lakes place at the first stage vvhereas crystallization of aluminum matrix arises at the second stage only. The effective magnetic moments per Cc (Dy) atoms were found to be smaller than for R3+ ions suggesting that rare-earth atoms create directed bonds with aluminum atoms. (C) 2015 Elsevier B.V. All rights reserved

The Influence of Ga Additions on Electric and Magnetic Properties of Co47Fe21B21Si5Nb6 Alloy in Crystal and Liquid States

The influence of small additions of gallium on electric resistivity and magnetic susceptibility of the bulk glass forming Co47Fe20.9B21.2Si4.6Nb6.3 alloy was studied in a wide temperature range up to 1830 K. Gallium atoms were found to increase resistivity but decrease susceptibility of the alloy. The suppositions about clusters surrounding Ga atoms in the melt and new GFA criterion are give

Laser-induced structural modifications of FeMoCuB metallic glasses before and after transformation into a nanocrystalline state

The effects of laser treatments on the structural and magnetic properties of metallic ribbons have been studied using the melt-spun Fe76MoCu1B15 alloy in as-quenched and nanocrystalline states. Fe-57 Mossbauer effect techniques, comprising transmission geometry measurements (TM) and detection of conversion electrons (CEMS), have been employed in addition to magnetization measurements, differential scanning calorimetry and x-ray diffraction. The Curie temperature of the as-quenched alloy was about 70 degreesC. The distributions of hyperfine magnetic fields as well as quadrupole splitting obtained from TM and CEM spectra have revealed the possibility of observing laser-induced structural modifications even at room temperature when the system is only weakly magnetic. Consequently, both types of hyperfine interactions have been detected and they are nearly in equilibrium (having the same strength or occurring to the same extent). After treatments with a pulsed XeCl excimer laser (with a homogeneous beam of 5 x 5 mm(2), 308 nm, 55 ns, 1 Hz), the significance of magnetic dipole interactions rises as a function of the number of laser pulses (up to 64) and the laser beam fluence (up to 3 J cm(-2)). No traces of laser-induced crystallization have been found. In the nanocrystalline Fe76Mo8Cu1B15 alloy, surface crystallization was already completely removed after the first pulse of 1 J cm(-2)