scholarly journals FORMATION OF THE INTERACTION ZONE AT THE INTERLAYER BOUNDARY OF THE EXPLOSION-BOILED COMPOSITE VT1-0 + MH45 IN CONTACT MELTING

2020 ◽  
pp. 7-13
Author(s):  
V. G. Shmorgun ◽  
A. G. Serov ◽  
O. V. Slautin ◽  
S. A. Kuznetsov ◽  
A. V. Malykh
Keyword(s):  
Solid Solution ◽  
Phase Composition ◽  
Liquid Phase ◽  
Liquid Metal ◽  
Melting Process ◽  
Contact Melting ◽  
Layered Composite ◽  
Interaction Zone ◽  
Continuous Layer ◽  
Solid Phases

It is shown that the replacement of the MH19 alloy with the MH45 alloy in the explosion-welded layered titanium-copper-nickel composite leads to a decrease in the temperature at which the liquid (metal melted by contact melting) is in equilibrium with the solid phases from 930 ° C (L↔TiCuNi + NiTi + CuTi) up to 860 ° C (L↔ TiCu+NiTi+TiNi); to a change in the mechanism of contact melting from diffusion to diffusion; to increase the proportion of titanium in the interaction zone from ~ 50 at.% to ~ 66 at.%. The development of the contact melting process at the interlayer boundary of the VT1-0 + MH45 layered composite after the solid solution is transformed into a liquid phase film leads to the formation of an interaction zone with the phase composition TiCuNi, TiNi (Cu), TiCu (Ni), TiNi (Cu) TiCu (Ni) . On the side of the MH45 alloy, a continuous layer of the ternary intermetallic TiCuNi adjoins it, and on the titanium side, αTi + TiNi (Cu).

scholarly journals PHASE COMPOSITION OF THE INTERACTION ZONE FORMED IN THE TI-CU SYSTEM COMPOSITE IN THE PRESENCE OF A LIQUID PHASE

2020 ◽  
pp. 18-24
Author(s):  
V. G. Shmorgun ◽  
O. V. Slautin ◽  
A. G. Serov ◽  
V. P. Kulevich
Keyword(s):  
Heat Treatment ◽  
Solid Solution ◽  
Phase Composition ◽  
Liquid Phase ◽  
Nickel Alloy ◽  
Intermetallic Compounds ◽  
Melting Temperature ◽  
Weight Fraction ◽  
Interaction Zone ◽  
Copper Nickel Alloy

It was shown that heat treatment of Ti-Cu system composites at temperatures above the melting temperature of copper (copper-nickel alloy) leads to the formation of an interaction zone, the structure and phase composition of which is determined by the temperature and time of existence of the liquid melt solid solution in contact with the interlayer. Other things being equal, an increase in the exposure time leads to an increase in the volume of reacted titanium and the weight fraction of titanium-rich intermetallic compounds in its structure.

scholarly journals STRUCTURE AND PHASE COMPOSITION OF COATING ON EP718 ALLOY AFTER HOT-DIP ALUMINIZING

2021 ◽  
pp. 7-11
Author(s):  
A. I. Bogdanov ◽  
V. G. Shmorgun ◽  
V. P. Kulevich ◽  
R. D. Evchits ◽  
N. V. Terpugov
Keyword(s):  
Solid Solution ◽  
Phase Composition ◽  
Outer Layer ◽  
Aluminum Content ◽  
Aluminide Coating ◽  
Aluminum Matrix ◽  
Heterogeneous Structure ◽  
Continuous Layer ◽  
Monoclinic Lattice

The results of studies of the structure, chemical and phase composition of the aluminide coating formed on the surface of EP718 alloy after its hot-dip aluminizing are presented. It is shown that the inner layer of the coating consists of a continuous layer of a solid solution based on chromium aluminide CrAl with a monoclinic lattice, in which some of the Cr atoms are replaced by atoms of elements from the EP718 alloy, and the outer layer, which has a pronounced heterogeneous structure, is an aluminum matrix with inclusions of CrAl aluminide. with a lower aluminum content.

scholarly journals FORMATION OF THE STRUCTURE AND COMPOSITION OF THE DIFFUSION INTERACTION ZONE DURING THE HEAT TREATMENT OF THE EXPLOSION-WELDED AD1 + Cr20Ni80 COMPOSITE IN THE PRESENCE OF A LIQUID PHASE

2021 ◽  
pp. 7-11
Author(s):  
V. G. Shmorgun ◽  
A. I. Bogdanov ◽  
D. V. Shcherbin ◽  
V. P. Kulevich
Keyword(s):  
Heat Treatment ◽  
Phase Composition ◽  
Melting Point ◽  
Liquid Phase ◽  
Intermetallic Compounds ◽  
Diffusion Coating ◽  
Phase Interaction ◽  
Interaction Zone ◽  
Coating Structure ◽  
Study Results

The paper presents the study results of the structure, chemical and phase composition of the diffusion coating formed during the heat treatment of the explosion-welded Cr20Ni80 + AD1 bimetal according to the regime providing liquid-phase interaction (above the melting point of aluminum) on the surface of the Cr20Ni80 alloy. It is shown that its structure consists of inclusions of NiAl, CrAl, NiAl intermetallic compounds, as well as a metastable ternary compound - τ-phase with composition of AlCrNi of different dispersion and morphology. There are no crystallization defects in the coating structure.

SOLID SOLUTION FORMATION DURING LIQUID PHASE SINTERING

1986 ◽  
Vol 47 (C1) ◽  
pp. C1-441-C1-445
Author(s):  
E. KOSTIĆ ◽  
S. J. KISS ◽  
D. CEROVIĆ
Keyword(s):  
Solid Solution ◽  
Liquid Phase ◽  
Liquid Phase Sintering ◽  
Solid Solution Formation ◽  
Solution Formation

scholarly journals Removal of Tramp Elements within 7075 Alloy by Super-Gravity Aided Rheorefining Method

Metals ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 701 ◽  
Author(s):  
Lei Guo ◽  
Xiaochun Wen ◽  
Qipeng Bao ◽  
Zhancheng Guo
Keyword(s):  
Heat Treatment ◽  
Liquid Phase ◽  
7075 Aluminum Alloy ◽  
Total Removal ◽  
Tramp Element ◽  
Removal Ratio ◽  
Gravity Coefficient ◽  
Flow Through ◽  
Solid Phases ◽  
7075 Alloy

An investigation was made on the super-gravity aided rheorefining process of recycled 7075 aluminum alloy in order to remove tramp elements. The separation temperatures in this study were selected as 609 °C, 617 °C and 625 °C. And the gravity coefficients were set as 400 G, 700 G, 1000 G. The finely distributed impurity inclusions will aggregate to the grain boundaries of Al-enriched phase during heat treatment. In the field of super-gravity, the liquid phase composed of tramp elements Zn, Cu, Mg et al. will flow through the gaps between solid Al-enriched grains and form into filtrate. Both the weight of filtrate and removal ratio of tramp element improved with the increase of gravity coefficient. The total removal ratio of tramp element decreased with the fall of temperature due to the flowability deterioration of liquid phase. The time for effective separation of liquid/solid phases with super-gravity can be restricted within 1 min.

Representation of VLE and liquid phase composition with an electrolyte model: application to H3PO4–H2O and H2SO4–H2O

2002 ◽  
Vol 194-197 ◽  
pp. 729-738 ◽  
Author(s):  
Mourad Cherif ◽  
Arbi Mgaidi ◽  
Mohamed Naceur Ammar ◽  
Manef Abderrabba ◽  
Walter Fürst
Keyword(s):  
Phase Composition ◽  
Liquid Phase ◽  
Model Application ◽  
Liquid Phase Composition

scholarly journals Preparation of Li3PS4–Li3PO4 Solid Electrolytes by Liquid-Phase Shaking for All-Solid-State Batteries

2021 ◽  
Vol 2 (1) ◽  
pp. 39-48
Author(s):  
Nguyen H. H. Phuc ◽  
Takaki Maeda ◽  
Tokoharu Yamamoto ◽  
Hiroyuki Muto ◽  
Atsunori Matsuda
Keyword(s):  
Solid Solution ◽  
Solid State ◽  
Liquid Phase ◽  
Room Temperature ◽  
Reaction Medium ◽  
Magic Angle Spinning ◽  
Resonance Spectroscopy ◽  
Synthesis Methods ◽  
Magic Angle ◽  
Angle Spinning

A solid solution of a 100Li3PS4·xLi3PO4 solid electrolyte was easily prepared by liquid-phase synthesis. Instead of the conventional solid-state synthesis methods, ethyl propionate was used as the reaction medium. The initial stage of the reaction among Li2S, P2S5 and Li3PO4 was proved by ultraviolet-visible spectroscopy. The powder X-ray diffraction (XRD) results showed that the solid solution was formed up to x = 6. At x = 20, XRD peaks of Li3PO4 were detected in the prepared sample after heat treatment at 170 °C. However, the samples obtained at room temperature showed no evidence of Li3PO4 remaining for x = 20. Solid phosphorus-31 magic angle spinning nuclear magnetic resonance spectroscopy results proved the formation of a POS33− unit in the sample with x = 6. Improvements of ionic conductivity at room temperature and activation energy were obtained with the formation of the solid solution. The sample with x = 6 exhibited a better stability against Li metal than that with x = 0. The all-solid-state half-cell employing the sample with x = 6 at the positive electrode exhibited a better charge–discharge capacity than that employing the sample with x = 0.

Microstructure and wear resistance of Cuss-toughened Cr5Si3/CrSi metal silicide alloys

2005 ◽  
Vol 20 (5) ◽  
pp. 1122-1130 ◽  
Author(s):  
Y.X. Yin ◽  
H.M. Wang
Keyword(s):  
Solid Solution ◽  
Wear Resistance ◽  
Sliding Wear ◽  
Room Temperature ◽  
Wear Test ◽  
Melting Process ◽  
Dry Sliding Wear ◽  
Metal Silicide ◽  
X Ray Diffraction ◽  
X Ray

Wear-resistant Cu-based solid-solution-toughened Cr5Si3/CrSi metal silicide alloy with a microstructure consisting of predominantly the dual-phase primary dendrites with a Cr5Si3 core encapsulated by CrSi phase and a small amount of interdendritic Cu-based solid solution (Cuss) was designed and fabricated by the laser melting process using Cr–Si–Cu elemental powder blends as the precursor materials. The microstructure of the Cuss-toughened Cr5Si3/CrSi metal silicide alloy was characterized by optical microscopy, powder x-ray diffraction, and energy dispersive spectroscopy. The Cuss-toughened silicide alloys have excellent wear resistance and low coefficient of friction under room temperature dry sliding wear test conditions with hardened 0.45% C carbon steel as the sliding–mating counterpart.

Changes in the structure of a thermal protective aluminum-nickel coating under the influence of a single thermal laser pulse

2021 ◽  
Vol 4 ◽  
pp. 25-30
Author(s):  
O. B. Berdnik ◽  
◽  
P. Yu. Kikin ◽  
V. N. Perevezentsev ◽  
E.N. Razov ◽  
...  
Keyword(s):  
Solid Solution ◽  
Heat Flux ◽  
Phase Composition ◽  
Nickel Coating ◽  
Microstructural Analysis ◽  
Radiation Energy ◽  
Heat Fluxes ◽  
Initial State ◽  
Nial Phase ◽  
Ni3al Phase

The regularities of changes in the structure and phase composition of the thermal protective aluminide-nickel coating (Ni — 45 %; Al — 14 %; Co — 22 %; Cr — 18.9 %; Fe — 0.15 %; Nb — 0.14 %; Y — 0.09 %; Ca — 0.06 %; Mn — 0.01 %; C — 0.15 %; Si — 0.15 %; S — 0.006 %) after exposure to short-term pulsed heat fluxes of various power, created by the radiation of a pulse-periodic laser LRS-150A with a radiation wavelength λ = 1.06 µm and a pulse duration τ = 12·10–3 s. The radiation energy was E = 5, 10, and 15 J. Microstructural analysis and the elemental composition of the resulting coating were carried out as well as analysis of the phase composition. X-ray microanalysis of the coating was also carried out. In the initial state and after irradiation of the coating with a heat flux of power P = 7·103 W/cm2, light microregions are observed in the micrographs of the surface. These regions do not have clearly defined external boundaries and consist of the NiAl phase and a small amount of the Ni3Al phase with the presence of inclusions of particles containing a solid solution of Ni – Co – Cr. After irradiation of the coating with heat fluxes of higher power (P = 1.7·104 W/cm2 and P = 2.2·104 W/cm2), large convex formations appeared on its surface, consisting mainly of Ni3Al and NiAl phases. On micrographs of the surface, they appear as white areas with well-defined outer boundaries. The content of the Ni3Al phase in them in comparison with the initial state increased, and the content of the NiAl phase decreased, while the particles of inclusions of Ni, Co, and Cr disappeared. It can be assumed that an increase in the Ni3Al content is associated with the dissolution of particles of a solid solution of Ni – Co and Cr in the melt and the subsequent diffusion of nickel into the NiAl phase. When exposed to a heat flux of power P = 2.2·104 W/cm2, microcracks appear on the areas of the coating surface covered with aluminum oxide.

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