Microstructure of Rapidly Solidified CuFe10 Alloys

2010 ◽  
Vol 160-162 ◽  
pp. 687-691
Author(s):  
Zhi Ming Zhou ◽  
Li Wen Tang ◽  
Chun Liu ◽  
Min Min Cao ◽  
Bin Bin Lei
Keyword(s):  
Rapid Solidification ◽  
Melt Spinning ◽  
Supersaturated Solid Solution ◽  
Wide Distribution ◽  
Wheel Speed ◽  
Solidification Behavior ◽  
Wheel Surface ◽  
Rich Phase ◽  
Mean Size ◽  
Rapidly Solidified

Rapid solidification of CuFe10 alloys was carried out by melt spinning at three wheel speeds 4, 12 and 36 m/s. The microstructure and solidification behavior of the ribbons was investigated by scanning electron microscopy (SEM). The results showed that the ribbons generally have a microstructure consisting of a fine dispersion of a Fe-rich phase in a Cu-rich matrix, and that the morphology and size of the Fe-rich phase vary with the wheel speed. For lower wheel speeds, the Fe-rich phase shows dual morphologies, dendrites and spheroids. The Fe-rich spheroids show a wide distribution of size, and have a larger mean size on the free surface than on the wheel surface. Some Fe-rich dendrites are distributed around the Fe-rich spheroids, this means liquid phase separation occurred during rapid solidification. The Fe-rich phase shows one morphology-spheroids and the size of Fe-rich spheroids decreasing as the wheel speed increasing. The results were discussed with respect to the formation of the Fe-rich spheroids during rapid solidification. The microhardness of the ribbons increasing with the increasing of the wheel speed for the grain refining and the increasing of supersaturated solid solution.

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.

New Fe-Ni Based Metal-Metalloid Glassy Alloys Prepared by Mechanical Alloying and Rapid Solidification

1996 ◽  
Vol 455 ◽  
Author(s):  
J. J. Suñol ◽  
M. T. Clavaguera-Mora ◽  
N. Clavaguera ◽  
T. Pradell
Keyword(s):  
Mechanical Alloying ◽  
Rapid Solidification ◽  
Melt Spinning ◽  
Magnetic Interaction ◽  
Processing Route ◽  
Mechanically Alloyed ◽  
Scanning Calorimetry ◽  
Glassy Alloys ◽  
Rapidly Solidified ◽  
Thermal Stability Of

ABSTRACTMechanical alloying and rapid solidification are two important routes to obtain glassy alloys. New Fe-Ni based metal-metalloid (P-Si) alloys prepared by these two different processing routes were studied by differential scanning calorimetry and transmission Mössbauer spectroscopy. Mechanical alloyed samples were prepared with elemental precursors, and different nominal compositions. Rapidly solidified alloys were obtained by melt-spinning. The structural analyses show that, independent of the composition, the materials obtained by mechanical alloying are not completely disordered whereas fully amorphous alloys were obtained by rapid solidification. Consequently, the thermal stability of mechanically alloyed samples is lower than that of the analogous material prepared by rapid solidification. The P/Si ratio controls the magnetic interaction of the glassy ribbons obtained by rapid solidification. The experimental results are discussed in terms of the degree of amorphization and crystallization versus processing route and P/Si ratio content.

Microstructures of Rapidly Solidified Hypereutectic Al-Si Alloy with Low-Titanium Content

2008 ◽  
Vol 575-578 ◽  
pp. 27-31
Author(s):  
Ai Qin Wang ◽  
Jing Pei Xie ◽  
Zhong Xia Liu ◽  
Ji Wen Li ◽  
Wen Yan Wang ◽  
...  
Keyword(s):  
Solid Solution ◽  
Melt Spinning ◽  
Supersaturated Solid Solution ◽  
Primary Silicon ◽  
Titanium Content ◽  
Nucleation And Growth ◽  
Solidification Processing ◽  
Equilibrium Solidification ◽  
Rapidly Solidified ◽  
Morphology Characteristics

In the present work, rapidly solidified alloys strips with Al-0.24Ti and Al-21Si-0.24Ti(in wt.%) were prepared by single roller melt-spinning method. The microstructures, phase and morphology characteristics of the resultant strips were characterized by means of scanning electron microscopy (SEM),transmission electric microscopy (TEM) and XRD technique. The results show that the grains have been refined after rapid solidification processing, and the micro-nanocrystalline grain are formed. The morphology characteristics can be changed. The microstructures of Al-0.24Ti alloys strip are micro-nanostructure α-Al solid solutions which are similar with granular or nodular, the corresponding SAD pattern is rings, it presents characteristic of polycrystal; Compared with equilibrium solidification, the microstructures of hypereutectic Al-Si alloy are changed obviously. They are composed of primary micro-nanostructure α-Al supersaturated solid solution and nanocrystal granular (α+Si) eutectic which set in the supersaturated solid solution. The nucleation and growth of primary silicon are suppressed and primary silicon can not precipitate, meanwhile, α-Al phase is nucleated which prior to eutectic, therefore the microstructures become into the metastable state. The mechanism of the formation for microstructures of melt-spinning alloys has also been discussed.

Rapidly Solidified Binary Tial Alloys

1986 ◽  
Vol 81 ◽  
Author(s):  
S. C. Huang ◽  
E. L. Hall ◽  
M. F. X. Gigliotti
Keyword(s):  
Electron Diffraction ◽  
Rapid Solidification ◽  
Melt Spinning ◽  
Grain Structure ◽  
Bending Tests ◽  
Tial Alloys ◽  
Compositional Effect ◽  
X Ray ◽  
Antiphase Domains ◽  
Rapidly Solidified

AbstractMelt spinning has been carried out on binary TiAl alloys at three Ti/Al ratios. Antiphase domains were observed in one ribbon specimen, but no significant disordering was induced by the rapid solidification as indicated by X-ray and electron diffraction analyses. Bending tests of both the ribbons and the consolidated counterparts showed a decrease in ductility with increasing Al concentration. This compositional effect can be correlated with the TiAl tetragonality (the c/a ratio) as well as the grain structure.

Investigation on Sub-Rapid Solidification Behavior of Semi-Solid Magnesium Alloy Metal

2011 ◽  
Vol 320 ◽  
pp. 156-162
Author(s):  
Hai Tao Teng ◽  
Bai Qing Xiong ◽  
Yon Gan Zhang ◽  
Ting Ju Li
Keyword(s):  
Magnesium Alloy ◽  
Rapid Solidification ◽  
Volume Fraction ◽  
Solidification Rate ◽  
Solid Particles ◽  
Solidification Behavior ◽  
Vacuum Suction ◽  
Semi Solid ◽  
Rapidly Solidified ◽  
Alloy Metal

In order to investigate sub-rapid solidification behavior of semi-solid magnesium alloy metal, a novel semi-solid processing technique, called new vacuum suction casting (NVSC), is used to manufacture thin castings of AZ91D Mg-alloy directly from a liquid metal. The resulting microstructures of castings are characterized in detail and linked to the solidification behavior. In the microstructure of the sub-rapidly solidified SSM sheet, the “preexisting” primary solid particles, with the morphology of near-globules or rosettes, disperse in the homogeneous matrix consisting of fine near-equiaxed secondary α-Mg grains and fine precipitates of β-Mg17Al12 intermetallics. Owing to rapid solidification rate, the volume fraction of the β phase in the sub-rapidly solidified SSM sheets is much lower than that in the as-cast ingot. In addition, the content of alloying elements of Al and Zn was higher in the grain boundaries and the eutectic structure than that in the primary solid particles and in the second α-grains.

Substructure Development in Rapidly Solidified B2-Type TiCo Ribbons

2005 ◽  
Vol 475-479 ◽  
pp. 849-852 ◽  
Author(s):  
Kyosuke Yoshimi ◽  
Minseok Sung ◽  
Sadahiro Tsurekawa ◽  
Akira Yamauchi ◽  
Ryusuke Nakamura ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Dislocation Density ◽  
Rapid Solidification ◽  
Melt Spinning ◽  
Grain Structure ◽  
Second Phase ◽  
Rapidly Solidified ◽  
Equiaxed Grain

Substructure development through aging and annealing treatments was studied for rapidly solidified TiCo ribbons using TEM. In as-spun ribbons, equiaxed grain structure was developed and its crystal structure was B2-ordered immediately after melt-spinning, while a small amount of fine precipitates existed as second phase. Some grains were dislocation-free but others contained a certain amount of curved or helical dislocations and loops. The dislocation density in the ribbons annealed at 700 °C for 24 h was obviously higher than those in the as-spun ribbons and the ribbons aged at 200 °C for 100 h. The increase of the dislocation density in the annealed ribbons would result from the absorption of excess vacancies. Therefore, the obtained results indicated that a large amount of supersaturated thermal vacancies were retained in TiCo as-spun ribbons by the rapid solidification.

Copper-Base Alloys Processed by Rapid Solidification and Ion Implantation

1985 ◽  
Vol 58 ◽  
Author(s):  
J.V. Wood ◽  
C.J. Elvidge ◽  
E. Johnson ◽  
A. Johansen ◽  
L. Sarholt-Kristensen ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Differential Scanning Calorimetry ◽  
Martensitic Transformation ◽  
Ion Implantation ◽  
Rapid Solidification ◽  
Melt Spinning ◽  
Scanning Calorimetry ◽  
Copper Base ◽  
Similarities And Differences ◽  
Rapidly Solidified

ABSTRACTAlloys of Cu-Sn and Cu-B have been processed by both melt spinning and ion implantation. In some instances (eg Cu-Sn alloys) rapidly solidified ribbons have been subjected to further implantation. This paper describes the similarities and differences in structure of materials subjected to a dynamic and contained process. For example in Cu-B alloys (up to 2wt% Boron) extended solubility is found in implanted alloys which is not present to the same degree in rapidly solidified alloys of the same composition. Likewise the range and nature of the reversible martensitic transformation is different in both cases as examined by electron microscopy and differential scanning calorimetry.

Rapidly Solidified AZ31 Magnesium Alloy Ribbons Used in Rechargeable Batteries

2005 ◽  
Vol 488-489 ◽  
pp. 291-294
Author(s):  
Hong Liang Zhao ◽  
Shao Kang Guan ◽  
Chun Xiang Zhang ◽  
Fei Yan Zheng ◽  
Li Guo Wang ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Melt Spinning ◽  
Rechargeable Batteries ◽  
Wheel Speed ◽  
Natural Choice ◽  
Mg17al12 Phase ◽  
Small Grains ◽  
Rapidly Solidification ◽  
The Cost ◽  
Rapidly Solidified

Better properties of magnesium make it a natural choice for use as an anode material in rechargeable batteries. However, the magnesium alloy thin sheets used in rechargeable batteries were produced by ingot casting and rolling. That technology was so complex and the cost was high. Rapidly solidification by melt spinning is an effect way to solve that problem. In this paper, the technology of rapidly solidified (RS) ribbons in Mg-3%Al-1%Zn-0.2%Mn alloy has been investigated using melt spinning technique. The effect of wheel speed on thickness and microhardness of the ribbons is presented. Microhardness is found to increase with the wheel speed. Rapidly solidification leads to small grains (1~2 µm). The plasticity of the ribbons was well. The quantity of Mg17Al12 decreases with the increase in wheel speed. When the wheel speed reaches 1600 rpm, no Mg17Al12 phase precipitates. As the increase of the wheel speed, the corrosion resistance of the ribbons changes better.

Rapid Solidification Microstructures and Precipitation in AL-Mn Alloys

1983 ◽  
Vol 28 ◽  
Author(s):  
R. J. Schaefer ◽  
D. Shechtman ◽  
F. S. Biancaniello
Keyword(s):  
Rapid Solidification ◽  
Growth Kinetics ◽  
Melt Spinning ◽  
X Ray Diffraction ◽  
X Ray ◽  
Rapidly Solidified ◽  
Solidification Microstructures ◽  
Al Matrix

ABSTRACTRapidly solidified Al containing up to to 15 wt.% Mn was prepared by melt spinning. The alloys were examined by TEM and X-ray diffraction in the as-spun condition and after annealing at 450°C. Four precipitate phases were detected, and their growth kinetics were correlated to subgrain structures in the Al matrix.

Numerical Simulation on Rapidly Solidified Melt Spinning CuFe10 Alloys

2011 ◽  
Vol 228-229 ◽  
pp. 416-421
Author(s):  
Zhi Ming Zhou ◽  
Wei Jiu Huang ◽  
M. Deng ◽  
Min Min Cao ◽  
Li Wen Tang ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Rapid Solidification ◽  
Melt Spinning ◽  
Vacuum Chamber ◽  
Solidification Process ◽  
One Dimensional ◽  
Heat System ◽  
Heat Transfer Theory ◽  
Rapidly Solidified

The numerical simulation model of single roller rapid solidification melt-spinning CuFe10 alloys was built in this paper. The vacuum chamber, cooling roller and sample were taken into account as a holistic heat system. Based on the heat transfer theory and liquid solidification theory, the heat transfer during the rapids solidification process of CuFe10 ribbons prepared by melt spinning can be approximately modeled by one-dimensional heat conduction equation, so that the temperature distribution and the cooling rate of the ribbon can be determined by the integration of this equation. The simulative results are coincident very well with the microstructure of rapid solidification melt spinnng CuFe10 alloys at three different wheel speeds 4, 12 and 36 m/s.

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