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Thermal, Structural and Electrical Properties of Some Bi-Cu-Ni Alloys

Marković B., Živković D., Manasijeyić D., Sokić M., Minić D., Talijan N., Stajić-Trošić J.

Archives of Metallurgy and Materials

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2014

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Vol. 59, iss. 1

117--120

EN

The Bi-Cu-Ni ternary system belongs to the group of potential Cu-Ni-based advanced lead-free solder materials for high temperature application. In this study microstructure investigation of the slow-cooled Bi-Cu-Ni samples was done using SEM-EDS analysis. The samples compositions were chosen along three cross-sections with molar ratio Cu:Ni=1:3, 1:1 and 3:1. The experimentally obtained phase structure was compared with the results of thermodynamic calculation according to CALPHAD method. Also, new results regarding thermal and electrical properties investigations of these alloys are presented in this paper, based on DSC and electroconductivity measurements.

PL

Trójskładnikowe stopy Bi-Cu-Ni należą do grupy potencjalnych zaawansowanych bezołowiowych materiałów do lutowania w wysokiej temperaturze opartych na stopach Cu-Ni. Analizę mikrostruktury wolno schłodzonych próbek Bi-Cu-Ni wykonano za pomocą technik SEM-EDS. Do badań wybrano próbki charakteryzujące się stałym molowym stosunkiem Cu:Ni=1:3, 1:1 i 3:1. Doświadczalnie otrzymaną strukturę faz porównano z wynikami obliczeń termodynamicznych metodą CALPHAD. Ponadto, nowe wyniki dotyczące badań właściwości cieplnych i elektrycznych stopów zostały przedstawione w tym artykule, na podstawie pomiarów DSC i przewodności elektrycznej.

2

The comparative study of Nd-Fe-B magnetic materials with different Nd content

Talijan N., Cosovic V., Grujic A., Zivkovic D., Zak T.

Archives of Materials Science

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2008

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Vol. 29, nr 4

184-188

EN

For better understanding of different Nd content effect on the magnetic properties of three types commercial Nd-Fe-B alloys with 10-12 wt% Nd (Nd-low), 21-25 wt% (Nd-stoich.), and 26-29 wt% Nd (Nd-rich) were simultaneously analyzed using X-Ray and 57Fe Mossbauer spectroscopy (MS) analysis. The observation was based on correlation of starting chemical composition with phase composition and magnetic properties in optimized magnetic state.

3

Morphology and hardness of Nd-Fe-B magnetic materials in polymer matrix

Grujic A., Stajic-Trosic J., Talijan N., Stevanovic J., Aleksic R.

Archives of Materials Science

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2008

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Vol. 29, nr 1-2

29-32

EN

The effect of different polymer binders and effect of binder percentage on morphology and hardness of synthesized Nd-Fe-B bonded composites is studied and presented. The ratio of epoxy binder content regarding to the Nd-Fe-B powder is varied as follows - 22: 78; 50:50; 75:25; 10:90; for two different combinations of polymer binder. The goal of this preliminary investigation was to obtain good morphology characteristics and satisfactory hardness values.

4

Thermomagnetic behavior and microstructure of a rapidly quenched Nd14Fe79B7 alloy

Cosovic V., Talijan N., Stajic-Trosic J., Grujic A., Zivkovic D., Zak T.

Archives of Materials Science

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2007

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Vol. 28, nr 1-4

20-24

EN

Changes in the phase composition and crystallite size, as well as changes in the magnetic behavior of overstoichiometric Nd14Fe79B7 alloy (32 mass% Nd), caused by the thermomagnetic measurements (TM), were observed in regard to the optimal magnetic state of this alloy. In the optimized magnetic state, the hard magnetic phase Nd2Fe14B is identified as the primary phase (up to 95 mass %), with a mean crystallite size about 60 nm, as determined by XRD analysis and Transmission electron microscopy (TEM). The derogation of magnetic properties after TM is due to decreased amount of Nd2Fe14B phase, the formation of Nd2O3 and different Fe(O)B phases, as well as an increase in the mean crystallite size (e.g. Nd2Fe14B . 95 nm).