Phase transformations of rapidly solidified nickel based superalloy

2005 ◽  
Author(s):  
Akeel Dhahir Subhi ◽  
Mohammed Jasim Kadhim ◽  
Ahmed Ali Moosa
Keyword(s):  
Phase Transformations ◽  
Nickel Based Superalloy ◽  
Rapidly Solidified

Phase transformations in rapidly solidified Nd33Fe77 alloy

1992 ◽  
Vol 50 (1) ◽  
pp. 56-57
Author(s):  
A. Zaluska ◽  
L.X. Liao ◽  
X. Chen ◽  
Z. Altounian ◽  
J.O. Ström-Olsen
Keyword(s):  
Phase Transformations ◽  
High Performance ◽  
Melt Spinning ◽  
Permanent Magnets ◽  
New Materials ◽  
Amorphous Precursor ◽  
Eutectic Melting ◽  
Subsequent Transformation ◽  
Fe Alloys ◽  
Rapidly Solidified

Nd-Fe alloys are important for high performance permanent magnets (usually in combination with B, C or N) and a knowledge of the metastable and stable phases of the system is necessary for the development of these new materials. An effective way to investigate such phases is by crystallizing an amorphous precursor.Amorphous ribbons of the binary alloy Nd33Fe77 were produced by melt-spinning. The phase transformations induced by heat treatment of the as-quenched ribbons is complex involving first the production of metastable phases followed by subsequent transformation into stable phases and finally eutectic melting.

Phase transformations in the rapidly solidified Ti40Zr20Hf20Pd20 alloy

2007 ◽  
Vol 57 (7) ◽  
pp. 631-634 ◽  
Author(s):  
N. Chen ◽  
Kefu Yao ◽  
D.V. Louzguine-Luzgin ◽  
Shengbao Qiu ◽  
S. Ranganathan ◽  
...  
Keyword(s):  
Phase Transformations ◽  
Rapidly Solidified

Phase transformations in rapidly solidified (Ti-Zr)50(Ni-Cu-Sn)50 alloys

2006 ◽  
Vol 438-440 ◽  
pp. 630-633 ◽  
Author(s):  
P. Ochin ◽  
V. Kolomytsev ◽  
A. Pasko ◽  
P. Vermaut ◽  
F. Prima ◽  
...  
Keyword(s):  
Phase Transformations ◽  
Rapidly Solidified

A Transmission Electron Microscopy study of the B2-DO3 ordering phase transformations in Fe-6.3wt% Si after rapid quenching and annealing

1988 ◽  
Vol 46 ◽  
pp. 772-773
Author(s):  
J. E. Wittig
Keyword(s):  
Phase Transformations ◽  
Melt Spinning ◽  
Magnetic Behavior ◽  
Microscopy Study ◽  
Rapid Quenching ◽  
Electron Microscopy Study ◽  
Silicon Alloys ◽  
Brittle Behavior ◽  
Transmission Electron ◽  
Rapidly Solidified

Iron-silicon alloys are extensively used in transformer cores owing to exceptional soft magnetic behavior that is optimized at about 6.5 wt% Si. Unfortunately this equilibrium microstructure is completely brittle at room temperature. The brittle behavior coincides with the onset of an ordering reaction of the disordered A2 into the B2 and DO3 superlattices at approximately 5 wt% Si. Rapid solidification methods have been shown to improve the ductility of Fe- 6.3 to 6.5 wt% Si. In this investigation, rapidly quenched and annealed samples of Fe-6.3wt% Si were examined in the transmission electron microscope (TEM) to study the ordering phase transformations of this alloy and its effect on the mechanical behavior.Samples of Fe-6.3wt% Si were rapidly solidified by melt spinning into ribbons (t=20-80 microns) as well as by splatting using an opposing piston double anvil method. Rapidly quenched samples were subsequently heat treated in evacuated quartz tubes at 500, 600, and 700 C for 24 h.

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