Fe‐Nd‐B permanent magnet prepared by hot extrusion of rapidly solidified melt‐spun filaments

1988 ◽  
Vol 63 (8) ◽  
pp. 3525-3527 ◽  
Author(s):  
C. J. Yang ◽  
R. Ray
Keyword(s):  
Permanent Magnet ◽  
Hot Extrusion ◽  
Melt Spun ◽  
Rapidly Solidified

Microstructural Variations in Melt-Spun Rapidly Solidified Ribbons

1985 ◽  
Vol 43 ◽  
pp. 54-55
Author(s):  
L. A. Bendersky ◽  
W. J. Boettinger
Keyword(s):  
Solid State ◽  
Processing Parameters ◽  
Heat Extraction ◽  
Solid State Reactions ◽  
Careful Examination ◽  
Ion Milling ◽  
Melt Spun ◽  
Wheel Side ◽  
Rapidly Solidified ◽  
Heat Extraction Rate

Rapid solidification produces a wide variety of sub-micron scale microstructure. Generally, the microstructure depends on the imposed melt undercooling and heat extraction rate. The microstructure can vary strongly not only due to processing parameters changes but also during the process itself, as a result of recalescence. Hence, careful examination of different locations in rapidly solidified products should be performed. Additionally, post-solidification solid-state reactions can alter the microstructure.The objective of the present work is to demonstrate the strong microstructural changes in different regions of melt-spun ribbon for three different alloys. The locations of the analyzed structures were near the wheel side (W) and near the center (C) of the ribbons. The TEM specimens were prepared by selective electropolishing or ion milling.

Spherulite Structures in a Melt Spun Fe-Ni Austenitic Steel

1985 ◽  
Vol 43 ◽  
pp. 52-53
Author(s):  
G. M. Michal ◽  
T. K. Glasgow ◽  
T. J. Moore
Keyword(s):  
Austenitic Steel ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Large Range ◽  
Amorphous Structure ◽  
Nucleation And Growth ◽  
Ni Alloys ◽  
Melt Spun ◽  
Crystal Fibers ◽  
Rapidly Solidified

Large additions of B to Fe-Ni alloys can lead to the formation of an amorphous structure, if the alloy is rapidly cooled from the liquid state to room temperature. Isothermal aging of such structures at elevated temperatures causes crystallization to occur. Commonly such crystallization pro ceeds by the nucleation and growth of spherulites which are spherical crystalline bodies of radiating crystal fibers. Spherulite features were found in the present study in a rapidly solidified alloy that was fully crysstalline as-cast. This alloy was part of a program to develop an austenitic steel for elevated temperature applications by strengthening it with TiB2. The alloy contained a relatively large percentage of B, not to induce an amorphous structure, but only as a consequence of trying to obtain a large volume fracture of TiB2 in the completely processed alloy. The observation of spherulitic features in this alloy is described herein. Utilization of the large range of useful magnifications obtainable in a modern TEM, when a suitably thinned foil is available, was a key element in this analysis.

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.

Hot extrusion of rapidly solidified Al-5 Si powders

1988 ◽  
Vol 22 (12) ◽  
pp. 1851-1855
Author(s):  
S. Pelletier ◽  
R. Angers ◽  
R. Tremblay
Keyword(s):  
Hot Extrusion ◽  
Rapidly Solidified

Microstructures in Rapidly Solidified Ll2-TYPE Ni-Al-Cr Alloys

1984 ◽  
Vol 39 ◽  
Author(s):  
S. C. Huang ◽  
K. M. Chang ◽  
E. L. Hall ◽  
R. F. Laforce
Keyword(s):  
Phase Separation ◽  
Cooling Rate ◽  
Phase Reaction ◽  
Microstructural Study ◽  
Melt Spun ◽  
Rapidly Solidified

ABSTRACTA microstructural study of the melt spun alloys Ni75 Al25. Ni72.5 Al22.5Cr5. and Ni67.5A120Cr12.5 was carried out. Variations in grain morpfology; phase separation and ordering structure were observed. The results are discussed in terms of alloy stoichiometry, Cr effect on phase reaction, microsegregation of Al and the cooling rate.

Large reversible magnetic entropy change in rapidly solidified Ni0.895Cr0.105MnGe1.05 melt-spun ribbons

2018 ◽  
Vol 97 ◽  
pp. 89-94 ◽  
Author(s):  
Anil Aryal ◽  
Abdiel Quetz ◽  
C.F. Sánchez-Valdés ◽  
P.J. Ibarra-Gaytán ◽  
Sudip Pandey ◽  
...  
Keyword(s):  
Magnetic Entropy Change ◽  
Entropy Change ◽  
Magnetic Entropy ◽  
Melt Spun ◽  
Melt Spun Ribbons ◽  
Rapidly Solidified

Brazing of Al2O3 with Rapidly Solidified Melt Spun Ni-Cr-P Alloy Ribbons

2006 ◽  
pp. 473-477
Author(s):  
T.M. Maciel ◽  
I.T.H. Chang ◽  
Martin Strangwood ◽  
Walman Benício de Castro
Keyword(s):  
Melt Spun ◽  
Rapidly Solidified
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