Phase transformations in hydrogen sorption-desorption by hydrides of intermetallic compounds of the CrB structural type

1992 ◽  
Vol 32 (5) ◽  
pp. 680-686 ◽  
Author(s):  
I. E. Nemirovskaya ◽  
A. N. Grechenko ◽  
A. M. Alekseev ◽  
V. V. Lunin
Keyword(s):  
Phase Transformations ◽  
Intermetallic Compounds ◽  
Structural Type ◽  
Hydrogen Sorption

scholarly journals HYDROGEN SORPTION PROPERTIES OF INTERMETALLIC COMPOUNDS La3-xMgxNi9

2016 ◽  
pp. 100-106 ◽  
Author(s):  
V. B. Son ◽  
Yu. Ya. Shimkus ◽  
B. P. Tarasov ◽  
R, V. Denis ◽  
V. A. Yartys
Keyword(s):  
Intermetallic Compounds ◽  
Sorption Properties ◽  
Hydrogen Sorption

Hydrogen sorption properties of new magnesium intermetallic compounds with MgSnCu4 type structure

2021 ◽  
Author(s):  
Z.A. Matysina ◽  
N.A. Gavrylyuk ◽  
M.Т. Kartel ◽  
A. Veziroglu ◽  
T.N. Veziroglu ◽  
...  
Keyword(s):  
Intermetallic Compounds ◽  
Type Structure ◽  
Sorption Properties ◽  
Hydrogen Sorption

Phase Transformations and Magnetic Properties of Electroplating Ni-Co on Aluminium

2014 ◽  
Vol 487 ◽  
pp. 80-83
Author(s):  
Yong Jun Hu ◽  
Dong Cao ◽  
Xi Qiang Li ◽  
Hui Ting Zheng ◽  
Xiao Ling Cheng ◽  
...  
Keyword(s):  
Solid Solution ◽  
Magnetic Properties ◽  
Magnetic Property ◽  
Phase Transformations ◽  
Intermetallic Compounds ◽  
Alloy Film ◽  
Β Phase ◽  
Al Matrix

In this paper, Ni-Co coatings on Al foil were prepared by electroplating to obtain Al/Ni-Co composite. Phase transformations and magnetic property of Al/Ni-Co composite heated at 823 K for 80 h were investigated. The results showed that obviously exchanged zone in Al matrix exited and the thickness was about 2.5μm. Ni diffused into the Al easilier than Co. β phase (AlNi and AlCo) and γ phase (Al (Ni, Co) solid solution) of Co-Ni-Al formed during the annealing. The Ms of was decreased significantly when Al diffused into the NiCo alloy film and formed Ni-Al and Co-Al intermetallic compounds.

scholarly journals Phase transformations during the crystallization of the AK7 alloy, neutralization of the harmful effect of iron by treating the melt with a pulsed electric current

2020 ◽  
Vol 96 (4) ◽  
pp. 17-29
Author(s):  
A.G. Prigunova ◽  
Keyword(s):  
Mechanical Properties ◽  
Phase Transformations ◽  
Electric Current ◽  
Intermetallic Compounds ◽  
Volume Fraction ◽  
Cluster Structure ◽  
Harmful Effect ◽  
Study Phase ◽  
Current Frequency ◽  
Pulsed Electric Current

The method of quenching-microstructural analysis, the so-called "stop-quenching", was used to study phase transformations during crystallization of the AK7 casting alloy of the Al-Si-Mg system. The alloy is smelted from scrap and waste, therefore it contains a large amount of impurities, including iron, copper. It was found that the formation of the structure of the AK7 alloy is carried out in the course of the following reactions: 1. Р → Аlα. 2. P → α-(Fe, Mn) 3Si2Al15 + Alα. 3. P → β-FeSiAl5 + Alα. 4. P + β-FeSiAl5 → α-(Fe, Mn, Cu)3Si2Al15. 5. P → β-FeSiAl5 + Si + Alα. 6. P → β-FeSiAl5 + α-(Fe, Mn, Cu)3Si2Al15 + Si + Alα. At the last stages of crystallization, eutectics are formed, which include phases with magnesium and copper: Mg2Si, π-FeMg3Si6Al8, W-Cu2Mg8Si6Al and θ-CuAl2. The transformation P → β + Si + Alα is realized both by the mechanism of cooperative growth of the β, Si, and Alα phases, and by the formation of double eutectics: P → Si + Alα and P → β + Alα, which grow simultaneously in the same temperature range from various centers of crystallization. The four-phase eutectic transformation P → β + α + Si + Alα is carried out according to the type of double or triple eutectic reactions: P → Si + Alα; P → α + Alα; P → β + Alα; β + Si + Alα. The main iron-containing phase in the AK7 alloy is the needle-shaped intermetallic compound β-FeSiAl5 - a stress concentrator, which leads to a decrease in mechanical properties. In this work, the neutralization of the harmful effect of iron was carried out by treating the melt with a unipolar pulsed electric current, under the influence of which the cluster structure of the melt changes. During crystallization, instead of β, a branched phase α is formed. The ratio of intermetallic compounds β and α depends on the processing modes. With optimal parameters of density and current frequency, at which the volume fraction of the branched phase α is the largest, the strength of the AK7 alloy increases by 32.1%, the hardness by 16.7%, and the relative elongation by 2.5 times, bringing its mechanical properties closer to the primary alloy AK7h. Keywords: aluminum-silicon alloys, phase transformations, iron-containing intermetallic compounds, growth forms, treatment of the melt with an electric current.

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