Abnormal resistivity behavior of Cu–Ni and Cu–Co alloys in undercooled liquid state

2012 ◽  
Vol 407 (21) ◽  
pp. 4108-4113 ◽  
Author(s):  
Fengxiang Guo ◽  
Ting Lu ◽  
Jingyu Qin ◽  
Hongliang Zheng ◽  
Xuelei Tian
Keyword(s):  
Liquid State ◽  
Undercooled Liquid ◽  
Co Alloys

Formation of Bulk Nanostructured Materials by Rapid Solidification

2000 ◽  
Vol 15 (7) ◽  
pp. 1605-1611 ◽  
Author(s):  
W. H. Guo ◽  
L. F. Chua ◽  
C. C. Leung ◽  
H. W. Kui
Keyword(s):  
Surface Tension ◽  
Rapid Solidification ◽  
Spinodal Decomposition ◽  
Liquid State ◽  
Nanostructured Material ◽  
Synthesis Process ◽  
Undercooled Liquid ◽  
Metastable Liquid ◽  
Characteristic Wavelength ◽  
Eutectic Melt

When a eutectic melt is undercooled below its liquidus T1 by a critical amount, it undergoes metastable liquid-state spinodal decomposition. The resulting morphologies can be described as intermixing undercooled liquid networks of characteristic wavelength λ. At a temperature substantially below T1, λ can be <100 nm. When λ ≤ 100 nm, the undercooled liquid networks break up into nanometer-size droplets/strips driven apparently by surface tension. The morphologies of the tiny droplets/strips can be frozen by subsequent crystallization. The as-crystallized specimen is a nanostructured material. It is microvoid free and the size of the constituent grains is rather uniform. Two systems, Pd40.5Ni40.5P19 and Pd82Si18, were chosen to illustrate the synthesis process.

scholarly journals Resistivity of Cu, Ni and Sb in undercooled liquid state

2021 ◽  
Vol 1885 (3) ◽  
pp. 032010
Author(s):  
Fengxiang Guo ◽  
Xueyu Zhang ◽  
Shousheng Liu ◽  
Zhigang Gai ◽  
Yibao Wang
Keyword(s):  
Liquid State ◽  
Undercooled Liquid

Structural change in silicon from undercooled liquid state to crystalline state during crystallization

2006 ◽  
Vol 294 (1) ◽  
pp. 16-21 ◽  
Author(s):  
Masahito Watanabe ◽  
Kensuke Higuchi ◽  
Akitoshi Mizuno ◽  
Kosuke Nagashio ◽  
Kazuhiko Kuribayashi ◽  
...  
Keyword(s):  
Structural Change ◽  
Liquid State ◽  
Crystalline State ◽  
Undercooled Liquid

Crystallization of undercooled liquid spinodals: Part II

1999 ◽  
Vol 14 (9) ◽  
pp. 3663-3667 ◽  
Author(s):  
K. L. Lee ◽  
H. W. Kui
Keyword(s):  
Phase Separation ◽  
Latent Heat ◽  
Spinodal Decomposition ◽  
Liquid State ◽  
Morphological Changes ◽  
Microstructural Analysis ◽  
The Other ◽  
Undercooled Liquid ◽  
Metastable Liquid ◽  
Undercooled Melt

We demonstrated in “Phase separation in undercooled molten Pd80Si20: Part I” that when a molten Pd80Si20 ingot is undercooled into its undercooling regimen with ΔT ≥ 220 K (ΔT = T1 – T, where T1 is the liquidus and T is the temperature of the undercooled melt), liquid-state phase separation by spinodal decomposition occurs. On crystallization, one of the metastable liquid spinodals becomes Pd3Si, whereas the other one turns into Pd9Si2. In both cases, Pd particles precipitate out. Microstructural analysis indicates the Pd3Si subnetwork forms first. It then acts as a seed for the subsequent crystallization of the remaining undercooled melt, which finally forms the Pd9Si2 dendrites. As crystallization proceeds, latent heat and volume contraction bring about morphological changes.

On the stability limits of the undercooled liquid state of Pd-Ni-P

1997 ◽  
Vol 226-228 ◽  
pp. 434-438 ◽  
Author(s):  
G. Wilde ◽  
S.G. Klose ◽  
W. Soellner ◽  
G.P. Görler ◽  
K. Jeropoulos ◽  
...  
Keyword(s):  
Liquid State ◽  
Undercooled Liquid ◽  
The Stability ◽  
Stability Limits

Lorentz microscopy study of magnetic domain walls in Fe-Cr-Co alloys

1978 ◽  
Vol 36 (1) ◽  
pp. 462-463
Author(s):  
Yalcin Belli
Keyword(s):  
Domain Walls ◽  
Magnetic Domain ◽  
Microscopy Study ◽  
Ferromagnetic Phase ◽  
Stable Phase ◽  
Magnetic Domains ◽  
Lorentz Microscopy ◽  
Magnetic Hardening ◽  
Electron Microscopes ◽  
Co Alloys

Fe-Cr-Co alloys have great technological potential to replace Alnico alloys as hard magnets. The relationship between the microstructures and the magnetic properties has been recently established for some of these alloys. The magnetic hardening has been attributed to the decomposition of the high temperature stable phase (α) into an elongated Fe-rich ferromagnetic phase (α1) and a weakly magnetic or non-magnetic Cr-rich phase (α2). The relationships between magnetic domains and domain walls and these different phases are yet to be understood. The TEM has been used to ascertain the mechanism of magnetic hardening for the first time in these alloys. The present paper describes the magnetic domain structure and the magnetization reversal processes in some of these multiphase materials. Microstructures to change properties resulting from, (i) isothermal aging, (ii) thermomagnetic treatment (TMT) and (iii) TMT + stepaging have been chosen for this investigation. The Jem-7A and Philips EM-301 transmission electron microscopes operating at 100 kV have been used for the Lorentz microscopy study of the magnetic domains and their interactions with the finely dispersed precipitate phases.

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