Computer Controlled Pyrometric Measurement of the Cooling Rate During Melt Spinning

1986 ◽  
pp. 270-275
Author(s):  
G. Frommeyer ◽  
E. Vogt
Keyword(s):  
Cooling Rate ◽  
Melt Spinning ◽  
Computer Controlled

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.

scholarly journals The Development of Rapidly Solidified Magnesium – Copper Ribbons

2016 ◽  
Vol 61 (2) ◽  
pp. 1083-1088
Author(s):  
M. Pastuszak ◽  
G. Cieślak ◽  
A. Dobkowska ◽  
J. Mizera ◽  
K.J. Kurzydłowski
Keyword(s):  
Corrosion Resistance ◽  
Cooling Rate ◽  
Melt Spinning ◽  
Diffraction Method ◽  
Electrode System ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Copper Addition ◽  
Rapidly Solidified ◽  
Thermal Stability Of

Abstract The aim of the present work was to plan and carry out an experiment consisting of amorphization of industrial magnesium alloy WE 43 (Mg - 4 Y - 3 RE - 0.5 Zr) modified by the copper addition. Investigated alloy modified with 20% of copper was rapidly quenched with the use of melt spinning technique. The effects of cooling rate on the structure and properties of the obtained material were extensively analyzed. The structure and phase analysis of samples were examined using X-ray diffraction method (XRD) while the thermal stability of the samples was determined by differential scanning calorimetry (DSC). Microstructure observations were also conducted. The microhardness tests (HV0.02) and corrosion resistance tests were carried out to investigate the properties of the material. Corrosion resistance measurements were held using a typical three-electrode system. As the result of the research, the effect of cooling rate on microstructure and properties of investigated alloy was determined.

Rapidly Solidified Microstructures in a Ti-22 Wt% Fe Alloy

1983 ◽  
Vol 28 ◽  
Author(s):  
W. A. Baeslack III ◽  
L. Weeter ◽  
S. Krishnamurthy ◽  
P. Smith ◽  
F. H. Froes
Keyword(s):  
Cooling Rate ◽  
Melt Spinning ◽  
Laser Surface ◽  
Power Relationship ◽  
Dendrite Structure ◽  
Melt Extraction ◽  
Grain Sizes ◽  
Columnar Grains ◽  
General Power ◽  
Rapidly Solidified

ABSTRACTRapidly-solidified microstructures were produced in aTi-22 wt% Fe alloy by laser surface melting, melt extraction, melt spinning and splat cooling. Increased cooling rates during solidification promoted increasingly finer beta grain sizes ranging from approximately 75 microns in a laser melt to 0.5 to 2.0 microns for splats. Beta grain morphologiesw ere generally equiaxed, although epitaxially-nucleated columnar grains were observed at the pool-substrate interface for laser melts. Fitting of the equiaxed beta grain size data to a λ0 = Boε−n0 power relationship for homogenous nucleation and isotropic growth resulted in Bo = 3 × 104 and no = 0.62. The refinement of dendrite structure with increasing cooling rate was also documented for laser melts. Dendrite spacing versus cooling rate data were fitted to a similar general power relationship and resulted in B1 = 45 and n1 = 0.34.

Effect of Cooling Rate on Microstructural Homogeneity and Grain Size of n-Type Si-Ge Thermoelectric Alloy by Melt Spinning

2010 ◽  
Vol 39 (10) ◽  
pp. 2251-2254 ◽  
Author(s):  
Pan Zhang ◽  
Zhong Wang ◽  
Hui Chen ◽  
Haijun Yu ◽  
Lei Zhu ◽  
...  
Keyword(s):  
Grain Size ◽  
Cooling Rate ◽  
Melt Spinning ◽  
Microstructural Homogeneity

Microstructures Development in Al-5Fe and Al-5Fe-3Y Alloys Solidified at Different Cooling Rate

2011 ◽  
Vol 189-193 ◽  
pp. 2462-2466
Author(s):  
Guo Fa Mi ◽  
Cui Fen Dong ◽  
Chang Yun Li ◽  
Hai Yan Wang
Keyword(s):  
Rare Earth ◽  
Phase Composition ◽  
Intermetallic Compound ◽  
Cooling Rate ◽  
Melt Spinning ◽  
Metastable Phase ◽  
Vacuum Melting ◽  
Suction Casting ◽  
Rapidly Solidified

Cast, sub-rapidly solidified and rapidly solidified Al-5Fe alloy and Al-5Fe-3Y alloy were respectively prepared by vacuum melting, suction casting and melt spinning. The effect of increasing cooling rate and adding rare earth Y alloy on microstructures and phase composition were investigated. The results showed that the acicular Al3Fe phase transferred to spherical phase and dispersed secondary precipitations were also found when 3.0 wt% Y was added in the Al-5Fe alloy. Meanwhile, the microstructures were apparently refined by the increasing of cooling rate. The metastable phase A16Fe and intermetallic compound A110Fe2Y phase have been observed in Al-5Fe alloy and Al-5Fe-3Y alloy, respectively.

On the effect of cooling rate during melt spinning of FINEMET ribbons

Nanoscale ◽  
2013 ◽  
Vol 5 (16) ◽  
pp. 7520 ◽  
Author(s):  
Tayebeh Gheiratmand ◽  
Hamid Reza Madaah Hosseini ◽  
Parviz Davami ◽  
Fatemeh Ostadhossein ◽  
Min Song ◽  
...  
Keyword(s):  
Cooling Rate ◽  
Melt Spinning

Some Fundamental Considerations During Rapid Solidification Processing

1983 ◽  
Vol 28 ◽  
Author(s):  
V. Laxmanan
Keyword(s):  
Cooling Rate ◽  
Rapid Solidification ◽  
Stability Criterion ◽  
Thermal Gradient ◽  
Absolute Stability ◽  
Melt Spinning ◽  
Rapid Solidification Processing ◽  
Dendritic Solidification ◽  
Solidification Processing ◽  
The Third

ABSTRACTThree estimates of the solidification rates required to obtain a fully homogeneous structure during rapid solidification processing (RSP) have been made. One is given by the “absolute stability” criterion and another obtained from a new analysis for dendritic solidification. The third estimate, also derived from the above analysis, requires that “hypercooled” conditions be maintained after nucleation. A mechanism for the formation of “featureless” segregation-free zones during melt spinning and atomization processes is suggested and expressions for the critical cooling rate and thermal gradient required to produce such structures have been obtained.

Behavior of Cr-Rich Phase during Rapid Solidification Cu71Cr29 Alloys

2011 ◽  
Vol 228-229 ◽  
pp. 101-105
Author(s):  
Zhi Ming Zhou ◽  
Li Wen Tang ◽  
Jing Luo ◽  
Tao Zhou ◽  
Jie Zhan ◽  
...  
Keyword(s):  
Cooling Rate ◽  
Rapid Solidification ◽  
Melt Spinning ◽  
The Other ◽  
Solidification Behavior ◽  
Rich Phase ◽  
Splat Quenching ◽  
The One ◽  
Average Size ◽  
Scanning Electron

Behavior of Cr-rich phase in rapid solidification Cu71Cr29 alloys was investigated by using melt spinning and splat quenching. The microstructure and solidification behavior of the Cr-rich were investigated by scanning electron microscopy (SEM). The results showed that the alloys generally have a microstructure consisting of a fine dispersion of a Cr-rich phase in a Cu-rich matrix. However, the morphology and size of the Cr-rich phase vary greatly with the cooling rate. On the one hand, the average size of the Cr-rich phase is reduced with increasing cooling rate. On the other hand, the Cr-rich phase show both dendrites and spheroids for lower cooling rate but only spheroids for the higher cooling rate. This means liquid phase separation occurred during rapid solidification. The results were discussed with respect to the formation of the Cr-rich spheroids during rapid solidification.

Influence of Solidification Speed on Quality and Quantity of Structural Defects in Fe61Co10Zr2.5Hf2.5Y2W2B20 Amorphous Alloy

2010 ◽  
Vol 654-656 ◽  
pp. 1074-1077 ◽  
Author(s):  
Marcin Nabiałek ◽  
Marcin Dośpiał ◽  
Michał Szota ◽  
Paweł Pietrusiewicz
Keyword(s):  
Amorphous Alloy ◽  
Cooling Rate ◽  
Melt Spinning ◽  
Structural Defects ◽  
Strongly Correlated ◽  
X Ray Diffraction ◽  
Linear Type ◽  
X Ray ◽  
Solidification Speed ◽  
Point Type

The microstructure of Fe61Co10Zr2,5Hf2,5Nb2W2B20 amorphous alloy in the form of ribbons obtained by classical melt spinning and plates obtained by an induction suction method were investigated using X-ray diffraction. The type of structural defects were studied by analysis of the magnetization characteristics near ferromagnetic saturation of the sample. It was shown that the presence of structural defects is strongly correlated with sample thickness and production process. It was shown that ribbons with cooling rate between 105-106 K/s have point type defects, wires obtained with lower cooling rate between 101-102 K/s, have linear type defect (quasi-dislocation dipoles). crystallization.

Preparation of Sm2Fe17 Columnar Grains Ribbons by Rapid Quenching

2014 ◽  
Vol 1004-1005 ◽  
pp. 367-370
Author(s):  
Guo Biao Lin ◽  
Xiang Luo ◽  
Wen Long Bi ◽  
Xiao Qian Bao ◽  
Wei Min Mao
Keyword(s):  
Cooling Rate ◽  
Melt Spinning ◽  
Injection Pressure ◽  
Rapid Quenching ◽  
Vacuum Melting ◽  
Nozzle Size ◽  
Columnar Grains

The ingot of Sm-Fe alloy was prepared by vacuum melting. After a process of coarse crushing, it was made into Sm-Fe ribbons by melt-spinning. By analysis of XRD and SEM, it was confirmed that the ribbons composed of fine Sm2Fe17columnar grains with almost the same orientation can be obtained under the condition of 5~7m/s surface rotating velocity of Cu wheel, suitable nozzle size, injection pressure, temperature and composition of the Sm-Fe melt to regulate cooling rate and crystallization. The achievement of the ribbons lays a foundation for preparing anisotropic Sm2Fe17Nxmagnetic powders by rapid quenching.

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