Enthalpy relaxation behaviour of (Fe, Co, Ni)75Si10B15 amorphous alloys upon low temperature annealing

1984 ◽  
Vol 19 (12) ◽  
pp. 3953-3966 ◽  
Author(s):  
A. Inoue ◽  
T. Masumoto ◽  
H. S. Chen
Keyword(s):  
Low Temperature ◽  
Amorphous Alloys ◽  
Enthalpy Relaxation ◽  
Relaxation Behaviour ◽  
Low Temperature Annealing

Domain structure fluctuations kinetics of amorphous alloys at low-temperature annealing

1986 ◽  
Vol 27 (1-4) ◽  
pp. 337-340 ◽  
Author(s):  
V. V. Lomonosov ◽  
V. D. Sedykh ◽  
T. Zemcík
Keyword(s):  
Low Temperature ◽  
Domain Structure ◽  
Amorphous Alloys ◽  
Low Temperature Annealing ◽  
Kinetics Of

scholarly journals Effect Of Low-Temperature Annealing On The Properties Of Ni-P Amorphous Alloys Deposited Via Electroless Plating

2015 ◽  
Vol 60 (2) ◽  
pp. 865-869 ◽  
Author(s):  
Guanlin Zhao ◽  
Yong Zou ◽  
Hui Zhang ◽  
Zengda Zou
Keyword(s):  
Low Temperature ◽  
Electroless Plating ◽  
Amorphous Alloys ◽  
Cluster Size ◽  
Amorphous Structure ◽  
X Ray Diffraction ◽  
Atomic Pair Distribution Function ◽  
Low Temperature Annealing ◽  
Atomic Pair ◽  
Diffraction Patterns

AbstractAmorphous Ni-P alloys were prepared via electroless plating and annealing at 200°C at different times to obtain different microstructures. The effects of low-temperature annealing on the properties of amorphous Ni-P alloys were studied. The local atomic structure of the annealed amorphous Ni-P alloys was analyzed by calculating the atomic pair distribution function from their X-ray diffraction patterns. The results indicate that the properties of the annealed amorphous Ni-P alloys are closely related to the order atomic cluster size. However, these annealed Ni-P alloys maintained their amorphous structure at different annealing times. The variation in microhardness is in agreement with the change in cluster size. By contrast, the corrosion resistance of the annealed alloys in 3.5 wt% NaCl solution increases with the decrease in order cluster size.

Change of the Magnetic Property in Some Amorphous Alloys by Low Temperature Annealing

1978 ◽  
Vol 17 (1) ◽  
pp. 257-258 ◽  
Author(s):  
Osamu Kohmoto ◽  
Norishige Yamaguchi ◽  
Kazuo Ohya ◽  
Hiroki Fujishima
Keyword(s):  
Magnetic Property ◽  
Low Temperature ◽  
Amorphous Alloys ◽  
Low Temperature Annealing

Enthalpy relaxation behaviour of Al-Si-Cr quasicrystalline and amorphous alloys upon annealing

1988 ◽  
Vol 23 (2) ◽  
pp. 429-437 ◽  
Author(s):  
A. Inoue ◽  
A. P. Tsai ◽  
H. M. Kimura ◽  
T. Masumoto
Keyword(s):  
Amorphous Alloys ◽  
Enthalpy Relaxation ◽  
Relaxation Behaviour

scholarly journals Enthalpy Relaxation of Polyamide 11 of Different Morphology Far Below the Glass Transition Temperature

Entropy ◽  
2019 ◽  
Vol 21 (10) ◽  
pp. 984 ◽  
Author(s):  
René Androsch ◽  
Katalee Jariyavidyanont ◽  
Christoph Schick
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Low Temperature ◽  
Supermolecular Structure ◽  
Enthalpy Relaxation ◽  
Crystalline Morphology ◽  
Polyamide 11 ◽  
Amorphous Phases ◽  
Low Temperature Annealing

Polyamide 11 (PA 11) samples of different supermolecular structure, including the crystal-free glass and semi-crystalline PA 11 of largely different semi-crystalline morphology, were prepared by fast scanning chip calorimetry (FSC). These samples were then annealed at different temperatures well below the glass transition temperature Tg. The main purpose of the low-temperature annealing experiments was the calorimetric detection of mobility of chain segments at temperatures as low as −40 °C (≈Tg − 80 K) where still excellent impact resistance is predicted. It was found that annealing PA 11 at such low temperature, regardless the thermal history and supermolecular structure including crystallinity as well as crystal shape and size, permits distinct enthalpy relaxation at rather short time scale with the structural changes reverting on subsequent heating as detected with pronounced sub-Tg-enthalpy-recovery peaks. The main glass transition, associated to large-amplitude segmental mobility, as well as relaxations at temperatures only slightly below Tg are even more distinctly sensitive to the crystal morphology. In contrast to spherulitically grown lamellar crystals, presence of high-specific-surface area nanometer-sized ordered domains causes a shift of the glass transition temperature of the amorphous phase to higher temperature, proving stronger coupling of ordered and amorphous phases than in case of lamellae. In addition, the increased coupling of the crystalline and amorphous phases slows down the cooperative rearrangements on annealing the glass slightly below Tg. The performed study contributes to further understanding of the spectrum of structural relaxations in PA 11 including the effect of presence of crystals. Enthalpy relaxation and consequently the reduction of entropy at temperatures slightly below Tg strongly depends on the semi-crystalline morphology, while an only minor effect is seen on low-temperature annealing at Tg − 80 K, possibly indicating different molecular mechanisms for the processes occurring in both temperature ranges. The low-temperature process even seems proceeding in the crystalline fraction of the material.

Low-temperature annealing of YBa2Cu3O7-x

1992 ◽  
Vol 50 (1) ◽  
pp. 88-89
Author(s):  
R.L. Sabatini ◽  
Yimei Zhu ◽  
Masaki Suenaga ◽  
A.R. Moodenbaugh
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Low Temperature ◽  
Oxygen Diffusion ◽  
Diffusion Rate ◽  
Oxygen Depletion ◽  
Low Temperature Annealing ◽  
Transmission Electron ◽  
Microstructural Effects ◽  
Oxygen Diffusion Rate

Low temperature annealing (<400°C) of YBa2Cu3O7x in a ozone containing oxygen atmosphere is sometimes carried out to oxygenate oxygen deficient thin films. Also, this technique can be used to fully oxygenate thinned TEM specimens when oxygen depletion in thin regions is suspected. However, the effects on the microstructure nor the extent of oxygenation of specimens has not been documented for specimens exposed to an ozone atmosphere. A particular concern is the fact that the ozone gas is so reactive and the oxygen diffusion rate at these temperatures is so slow that it may damage the specimen by an over-reaction. Thus we report here the results of an investigation on the microstructural effects of exposing a thinned YBa2Cu3O7-x specimen in an ozone atmosphere using transmission electron microscopy and energy loss spectroscopy techniques.

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