Investigation on Physical Properties of Ti-Based Quasicrystalline

2012 ◽  
Vol 479-481 ◽  
pp. 471-475
Author(s):  
Wan Qiang Liu ◽  
Xin Lu Wang ◽  
Shan Shan Zhang ◽  
Li Min Wang
Keyword(s):  
Heat Capacity ◽  
Temperature Increase ◽  
Melt Spinning ◽  
Magnetic Behavior ◽  
Exothermic Peak ◽  
Continuous Heating ◽  
Icosahedral Quasicrystal ◽  
Vacuum Furnace ◽  
Ni Alloy ◽  
Melt Spinning Technique

The Ti1.4V0.6Ni ribbon alloy containing icosahedral quasicrystal is prepared by melt-spinning technique, and the Ti40.33Zr40.33Ni18.34 icosahedral quasicrystal powders are prepared by mechanical alloying. Both samples are annealing in a vacuum furnace. DSC trace obtained during continuous heating to 1300°C show a distinctly broad exothermic peak between 100°C and 1000°C for the Ti1.4V0.6Ni alloy, two sharp exothermic peaks between 100°C and 700°C for the Ti40.33Zr40.33Ni18.34, respectively. The magnetic behavior results demonstrated the Ti1.4V0.6Ni ribbon alloy exhibited higher ferromagnetic properties than those of Ti40.33Zr40.33Ni18.34 powders both at 15 K and 300 K. The specific heat capacity of two the sample increase when the temperature increase from 400 to 650°C.

Electrical resistivity, susceptibility and heat capacity of cubic Kondo compound YbCu5 prepared by melt-spinning technique

2006 ◽  
Vol 378-380 ◽  
pp. 738-739 ◽  
Author(s):  
Marián Reiffers ◽  
Bogdan Idzikowski ◽  
Josef Šebek ◽  
Eva Šantavá ◽  
Sergej Ilkovič ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Electrical Resistivity ◽  
Melt Spinning ◽  
Melt Spinning Technique

Rapidly Solidified Melt-spun Bi-Sn Ribbons: Surface Composition Issues

2016 ◽  
pp. 3287-3297
Author(s):  
Tarek El Ashram ◽  
Ana P. Carapeto ◽  
Ana M. Botelho do Rego
Keyword(s):  
Chemical Composition ◽  
Optical Microscopy ◽  
Melt Spinning ◽  
Surface Composition ◽  
Electrochemical Process ◽  
Melt Spun ◽  
Bismuth Alloy ◽  
The One ◽  
Rapidly Solidified ◽  
Melt Spinning Technique

Tin-bismuth alloy ribbons were produced using melt-spinning technique. The two main surfaces (in contact with the rotating wheel and exposed to the air) were characterized with Optical Microscopy and AFM, revealing that the surface exposed to the air is duller (due to a long-range heterogeneity) than the opposite surface. Also the XPS chemical composition revealed many differences between them both on the corrosion extension and on the total relative amounts of tin and bismuth. For instance, for the specific case of an alloy with a composition Bi-4 wt % Sn, the XPS atomic ratios Sn/Bi are 1.1 and 3.7 for the surface in contact with the rotating wheel and for the one exposed to air, respectively, showing, additionally, that a large segregation of tin at the surface exists (nominal ratio should be 0.073). This segregation was interpreted as the result of the electrochemical process yielding the corrosion products.

Microstructural Studies of NiCoMnIn Magnetic Shape Memory Ribbons

2013 ◽  
Vol 738-739 ◽  
pp. 436-440 ◽  
Author(s):  
Krystian Prusik ◽  
Katarzyna Bałdys ◽  
Danuta Stróż ◽  
Tomasz Goryczka ◽  
Józef Lelątko
Keyword(s):  
Melt Spinning ◽  
Room Temperature ◽  
Parent Phase ◽  
Magnetic Shape Memory ◽  
Melt Spun ◽  
Columnar Grains ◽  
Ebsd Technique ◽  
Microstructural Studies ◽  
Melt Spinning Technique ◽  
Scanning Electron

In present paper two ribbons of the Ni44Co6Mn36In14 (at.%) were prepared under different melt-spinning technique conditions. Microstructure of the ribbons was studied by scanning electron microscopy (SEM). Depending on the liquid ejection overpressure two types of ribbons microstructures were observed. Ribbon T1 for which ejection overpressure was 1.5 bar showed typical melt-spun ribbon microstructure consisting of a top layer of small equi-axial grains and columnar grains below. For T2 ribbon (ejection overpressure 0.2 bar) only a small fraction of the columnar grains were observed. Structure analysis of the ribbons performed by XRD showed that at room temperature both ribbons have B2 parent phase superstructure. No gamma phase precipitates were observed. In order to determine the orientation of the grains the EBSD technique was applied.

Synthesis and Characterization of Mnbi Magnetic Alloy via Two Different Processing Routes

2021 ◽  
Vol 875 ◽  
pp. 76-80
Author(s):  
Hifsa Mazhar ◽  
Wilayat Hussain
Keyword(s):  
Heat Treatment ◽  
Melt Spinning ◽  
Treatment Time ◽  
Magnetic Energy ◽  
Microstructural Characterization ◽  
Temperature Phase ◽  
Magnetic Alloy ◽  
Positive Temperature ◽  
Melt Spinning Technique

Manganese bismuth alloy has gained importance due to its rare earth free elements, positive temperature coefficient and unique magnetic properties. Low temperature phase (LTP) MnBi was successfully prepared by arc melting with subsequent heat treatments and melt spinning technique followed by heat treatment for different durations. LTP MnBi formation was confirmed using XRD analysis and microstructural characterization of the samples was done using field emission scanning electron microscope. MnBi with greater LTP amount was formed by melt spinning route when compared with its counter arc melted one. Magnetic energy density of LTP MnBi formed by melt spinning technique with different heat treatment time was studied.

Microstructure and Melting Behavior of Rapid Solidified Au-Ag-Ge Alloy

2012 ◽  
Vol 531-532 ◽  
pp. 618-622
Author(s):  
Da Tian Cui ◽  
Wen Hui Liu ◽  
Long Fei Liu
Keyword(s):  
Grain Boundaries ◽  
Cooling Rate ◽  
Melt Spinning ◽  
Melting Behavior ◽  
Exothermic Peak ◽  
Minimum Size ◽  
Thickness Direction ◽  
Liquid Temperature ◽  
Alloy Ingot ◽  
Precipitated Phase

Rapid solidified Au-Ag-Ge alloy was prepared by the melt spinning method，microstructure and melting behavior of the rapid solidified alloy was investigated by means of SEM, TEM and DSC. DSC results show that liquid temperature of the rapid solidified alloy is about 3～4°C lower than that of the alloy ingot, melting interval is also smaller. Minimum size of 40nm nanocrystalline has formed when the cooling rate is 1.293×106K/sec. Metastable supersaturated precipitated Ge-rich phases have been found at the grain boundaries, a structure mutation was found in the thickness direction of the rapid solidified alloy. Meanwhile, due to the stabilization transition of the supersaturated precipitated phase of the rapid solidified alloy, an exothermic peak has formed in the DSC curve, temperature of the exothermic peak becomes much lower when the cooling rate increases.

New, Experimental Powder Diffraction Data for Metastable Fe3B Phase Prepared According to ICDD Standards

2010 ◽  
Vol 163 ◽  
pp. 173-176
Author(s):  
Lucjan Pająk ◽  
E. Olszewska ◽  
Stanislaw Pikus ◽  
Grzegorz Dercz ◽  
Józef Rasek
Keyword(s):  
Powder Diffraction ◽  
Diffraction Data ◽  
Melt Spinning ◽  
Powder Diffraction Data ◽  
X Ray Diffraction ◽  
X Ray ◽  
Lattice Constants ◽  
Graphite Monochromator ◽  
Best Fitting ◽  
Melt Spinning Technique

In the present work X-ray studies were performed on annealed Fe78Nb2B20 amorphous alloy prepared by melt-spinning technique. All the samples were annealed in vacuum for 1 hour at temperatures up to 800°C. For the studied alloy -Fe and Fe2B are the stable, crystalline phases. The -Fe crystallized as the first crystalline phase in the sample annealed at 350°C. On the other hand, metastable Fe3B phase appeared to be stable during annealing in 425-800°C temperature range. The best fitting of the experimental X-ray data to as jet available ICDD files was obtained for Ni3P type structure (39-1315 – S.G.: I (82)). New, experimental powder diffraction data for metastable Fe3B phase prepared according to ICDD standards were elaborated for the sample annealed at 600°C. For this sample the best agreement between the calculated values of lattice constants and positions of experimental diffraction lines was obtained. The X-ray data were collected using X-Pert Philips diffractometer equipped with curved graphite monochromator on diffracted beam. The Treor program was applied for the analysis of X-ray diffraction data.

Influence of Co-Doping on Magnetic Properties and Magnetocaloric Effect of Fe–Co–Zr–Cu–B Melt-Spun Ribbons

2021 ◽  
Vol 21 (4) ◽  
pp. 2552-2557
Author(s):  
Nguyen Hai Yen ◽  
Nguyen Hoang Ha ◽  
Pham Thi Thanh ◽  
Nguyen Huy Ngoc ◽  
Tran Dang Thanh ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetocaloric Effect ◽  
Melt Spinning ◽  
Room Temperature ◽  
Tangential Velocity ◽  
Magnetic Behavior ◽  
Entropy Change ◽  
Co Doping ◽  
Melt Spun ◽  
Melt Spun Ribbons

In this work, we investigated magnetic properties and magnetocaloric effect in Fe90−xCoxZr7Cu1B2 (x = 0, 1, 2, 3 and 4) melt-spun ribbons. The ribbons were prepared by using a melt-spinning method with a tangential velocity of a copper wheel of 40 m·s-1. The obtained ribbons are almost amorphous. The alloys exhibit typical soft magnetic behavior with low coercivity at room temperature. A minor replacement of Fe by Co gives an increment in Curie temperature (TC) of the alloys to higher temperatures. The TC of the alloys increases from 242 to 342 K with an increase of x from 0 to 4. Maximum magnetic entropy change, ΔSm max, of the alloys, was found to be larger than 0.7 J·kg-1·K-1 in a magnetic field change ΔH of 12 kOe for all the concentrations of Co. High refrigerant capacitys (RC >100 J ·kg-1 with ΔH = 12 kOe) at room temperature region have been obtained for the alloys. The large magnetocaloric effect near room temperature suggests that the alloys can be considered as magnetic refrigerants in the range of 250–350 K.

scholarly journals The Effect of B and Si Additions on the Structural and Magnetic Behavior of Fe-Co-Ni Alloy Prepared by High-energy Mechanical Milling

2020 ◽  
Vol 33 (9) ◽  
pp. 2727-2735
Author(s):  
N. Khitouni ◽  
R. Daly ◽  
L. Escoda ◽  
N. Llorca-Isern ◽  
J. J. Suñol ◽  
...  
Keyword(s):  
Mechanical Milling ◽  
Magnetic Behavior ◽  
High Energy ◽  
Ni Alloy
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