scholarly journals Features of nickel alloy structure, conditions for crystallization and isolation of main and redundant phases during modification

2020 ◽  
pp. 35-39
Author(s):  
Yu. O. Filippov ◽  
◽  
E. N. Eremin ◽  
D. A. Sedykh ◽  
O. V. Kropotin ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Thermal Analysis ◽  
Solid Solution ◽  
Growth Rate ◽  
Solidus Temperature ◽  
Structure And Properties ◽  
Alloy Structure ◽  
Additional Heat ◽  
Kinetics Of ◽  
Strengthening Phases

The influence of modification of heat-resistant nickel-based alloys on the crystallization kinetics of alloys was established by the methods of thermal analysis. This effect is expressed in the increase in solidus temperature and, as a consequence, narrowing the crystallization range of the alloy, the increase in the growth rate of a solid solution, and change in the temperature of precipitation of eutectic and strengthening phases. As a result, the use of modification with refractory particles makes it possible to exert an additional effect on the structure and properties of nickel-based alloys without additional heat treatment

The Impacts of Heat Treatment on the Material Structure and Properties of Mg-4.0Zn-1.0Ca-0.6Zr Bio-Medical Materials

2013 ◽  
Vol 395-396 ◽  
pp. 662-666
Author(s):  
Xue Fei Zhang ◽  
Tian Guo Zhou ◽  
Ren Guo Guan ◽  
Tong Cui
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Aging Time ◽  
Material Structure ◽  
Structure And Properties ◽  
Treatment Processes ◽  
Maximum Value ◽  
Medical Materials ◽  
Alloy Microstructure ◽  
Strengthening Phases

The Mg-4.0Zn-1.0Ca-0.6Zr alloy was prepared through casting-homogenizing-rolling and the study was made on the alloy microstructure as well as mechanical properties under different heat treatment processes. The result shows that, alloy sheets have their hardness and tensile strength rising at the first phase and inclining later with the extension of aging time, in which the maximum values gained at 12h i.e. 71.2HV and 320MPa accordingly. At 8h of aging the extensibility obtained maximum value of 19.2%, then the value reduced gradually with the continuous aging time. The mechanical properties of alloy sheets increased after tempering process, the reason should be that, inside of the crystal particles rich amount of Mg6Ca2Zn3and MgZn strengthening phases were separated out.

The Influence of Heat Treatment Parameters on the Thermal Diffusivity of WE54 and Elektron 21 Magnesium Alloys

2011 ◽  
Vol 312-315 ◽  
pp. 489-494 ◽  
Author(s):  
Andrzej Kiełbus ◽  
Tomasz Rzychoń ◽  
Grzegorz Moskal
Keyword(s):  
Thermal Conductivity ◽  
Heat Treatment ◽  
Solid Solution ◽  
Thermal Diffusivity ◽  
Magnesium Alloys ◽  
Solute Element ◽  
Strengthening Phases

In the present study, the thermal diffusivity and conductivity of WE54 and Elektron 21 alloys were studied. The results showed the thermal diffusivity of WE54 and Elektron 21 alloys were temperature and microstructure dependent. The thermal diffusivity of both alloys was dependent on the content of the solute element in the α-Mg matrix. The solid solution of Y and Gd in Mg has a lower thermal conductivity than alloys where the intermetallic Mg3(Nd,Gd) and Mg14Y2Nd phases are present. The formation of strengthening phases during ageing caused the consumption of the solute element in the α -Mg matrix, and improved the thermal conductivity of the alloys.

Changes in the structural and textural state of titanium alloy VT41 after hot upsetting and annealing

2021 ◽  
pp. 40-50
Author(s):  
P. N. Medvedev ◽  
S. A. Naprienko ◽  
O. S. Kashapov ◽  
E. V. Filonova
Keyword(s):  
Heat Treatment ◽  
Titanium Alloy ◽  
Gas Turbine ◽  
Structural Changes ◽  
Annealing Temperature ◽  
Alloy Structure ◽  
Turbine Engine ◽  
Α Phase ◽  
Deformed State ◽  
Kinetics Of

A study of the structure of titanium alloy VT41 (Ti–Al–Si–Zr–Sn– β-stabilizers) was carried out on a sample subjected to hot upsetting in the (α+β)-region – conditions simulating the stamping of a disk of a gas turbine engine (GTE). The features of the formation of the textural state of primary and secondary globular grains, as well as the kinetics of their dissolution with an increase in the annealing temperature, have been determined. As a result of heat treatment at 995°C, the homogeneity of the alloy structure significantly increases comparing to the deformed state, which is associated with the recrystallization of lamellar and small-globular grains and the retention of primary globular grains of the α-phase. The sequence of structural changes has been established during the annealing within the temperature range from 950 to 1040°C.

Structure and properties of coating based on copper and zinc particles applied by gas-dynamic spraying

2020 ◽  
pp. 45-49
Author(s):  
V.E. Arkhipov ◽  
A.F. Londarski ◽  
G.V. Moskvitin ◽  
M.S. Pugachev
Keyword(s):  
Heat Treatment ◽  
Solid Solution ◽  
Subsequent Heat Treatment ◽  
Structure And Properties ◽  
Coating Structure ◽  
Β Phase ◽  
Gas Dynamic ◽  
Copper And Zinc

The presence of the process of diffusion of copper into zinc during gas-dynamic spraying of a coating based on a mixture of copper and zinc particles with the formation of the η-phase is shown. Subsequent heat treatment in the furnace at temperature 405÷415 °С is accompanied by the formation of a "multicomponent brass" coating based on β-phase CuZn and γ-phase Cu5Zn8 phases with hardness up to ≈290 HV and a-solid solution with hardness up to ≈120 HV. Keywords gasdynamic spraying, coating, structure, hardness, phases, electronic connections, brass [email protected]

Influence of Magnesium on Structure and Properties of Al-Si Alloy

2007 ◽  
Vol 23 ◽  
pp. 291-294 ◽  
Author(s):  
Mohammad M. Haque ◽  
Ahsan Ali Khan
Keyword(s):  
Thermal Conductivity ◽  
Heat Treatment ◽  
Solid Solution ◽  
High Resistance ◽  
Base Alloy ◽  
Deformation Behaviour ◽  
Low Density ◽  
Structure And Properties ◽  
Silicon Alloys ◽  
Impurity Elements

Aluminium-silicon alloys have low density, high electrical and thermal conductivity and high resistance to corrosion at ambient temperature. However, these alloys usually contain numerous alloying and impurity elements, which consist essentially of a fairly ductile matrix of alpha aluminium solid solution with a variety of non-ductile particles of silicon and various intermetallic compounds. The shape and distribution of these constituents largely control the deformation behaviour of the alloy. The addition of magnesium makes the alloys lighter and harder, but its hardening effect is fully responsive only after proper heat treatment. Therefore, in the present study, microstructures and properties of the alloys have been evaluated on the as-cast and heattreated conditions. Results show that the addition of magnesium to aluminium-silicon eutectic base alloy refines microstructure up to certain level and increases the strength and hardness at the expense of ductility.

scholarly journals Investigation of the Structure and Properties of Deformed Semi-Finished Products from Alloys of the Al-REM System Made by the Method of Ingotless Rolling-Extruding

2020 ◽  
Vol 837 ◽  
pp. 9-15
Author(s):  
Vadim Bespalov ◽  
Sergey Sidelnikov ◽  
Viktor Berngardt ◽  
Denis Voroshilov ◽  
Olga Yakivyuk ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Electrical Resistivity ◽  
Chemical Composition ◽  
Grain Structure ◽  
Metallographic Analysis ◽  
Structure And Properties ◽  
Alloy Structure ◽  
Deformed State ◽  
Alloys Of The Al

The article presents the investigation results of the structure and properties of rods of aluminum alloys containing zirconium, cerium and lanthanum after ingotless rolling-extruding (IRE) and heat treatment. The patterns of changes in the microstructure, mechanical properties, electrical resistivity depending on the chemical composition of the alloys, processed by the IRE method and various modes of rods annealing are shown. A metallographic analysis of the grain structure of the samples in a deformed state and after annealing performed. The temperatures at which the alloy structure remains stable and maintains the level of operational properties revealed. The effect of chemical composition on the heat resistance of deformed semi-finished products represented. The study made it possible to evaluate the level of properties of experimental alloys after processing by the method of ingotless rolling-extruding and various modes of rods annealing.

MAGNETIC PROPERTIES, NANOSTRUCTURE AND ORDERING KINETICS OF FePtCu THIN FILMS

2009 ◽  
Vol 23 (06n07) ◽  
pp. 1652-1657 ◽  
Author(s):  
G. J. CHEN ◽  
Y. H. SHIH ◽  
J. S. C. JANG ◽  
S. R. JIAN ◽  
W. C. CHANG ◽  
...  
Keyword(s):  
Thin Films ◽  
Heat Treatment ◽  
Activation Energy ◽  
Solid Solution ◽  
Magnetic Properties ◽  
Heating Rates ◽  
Cu Content ◽  
Fept Alloy ◽  
Ordering Kinetics ◽  
Kinetics Of

In this study, the ( FePt )100- x Cu x ( x =0, 4.6, 6.7, 8.8, 10.9) ( FePtCu ) alloy films were prepared by co-sputtering. The effects of Cu addition content and heat treatment on the nanostructure and magnetic properties of the polycrystalline ( FePt )100- x Cu x films are reported. The experimental results show that the ordering temperature of the ( FePt )100- x Cu x ( x =6.7) films reduced to 320°C, which is much lower than that of the FePt alloy. After heat treatment at 600°C for 1 hour, the ( FePt )100- x Cu x ( x =6.7) film shows a coercive force of 15 kOe and the magnetization of 576 emu/cc. The magnetic properties of the FePtCu films can be adjusted by varying the Cu content in the films. The enhancement of the magnetic properties of the FePtCu films mainly resulted from the formation of the order L 10 phase. DSC traces of as-deposited disorder films at different heating rates, to evaluate the crystallization of the order phase, showed that the addition of Cu atoms reduced the activation energy of ordering from 217 kJ/mol to 87 kJ/mol for the ( FePt )100- x Cu x films ( x = 0 and 6.7, respectively). The reduction of the ordering temperature and corresponding activation energy might due to the solid solution of the Cu atoms in the FePt films.

Study of Heat Treatment Parameters in Obtaining Glassceramic Materials with the Addition of Industrial Wastes

2014 ◽  
Vol 805 ◽  
pp. 598-603
Author(s):  
Cláudia Terezinha Kniess ◽  
G.J.M. Martins ◽  
P.B. Prates ◽  
Humberto Gracher Riella ◽  
Jonas V. Matsinhe ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Thermal Analysis ◽  
Grain Size ◽  
Differential Thermal Analysis ◽  
Material Properties ◽  
Bottom Ash ◽  
Industrial Wastes ◽  
Residual Amorphous Phase ◽  
Kinetics Of ◽  
Crystallization Of Glass

The production of materials from crystallization of glass, called glassceramic, have proved interesting by the possibility of development of different microstructures, with reduced grain size and the presence of residual amorphous phase in different quantities. The method that uses the differential thermal analysis (DTA) provides research on the material properties over a wide temperature range, it ́s widely applied to crystallization processes of glassceramic materials. Within this context, this paper aims to study the kinetics of nucleation and crystal growth in glassceramic materials in the system SiO2-Al2O3-Li2O, obtained with the addition of mineral coal bottom ash as source of aluminosilicates, through the technique of differential thermal analysis.

Study of structure, phase composition and physicomechanical properties of modified castings from heat-temperature ZhS3DK alloy

2021 ◽  
pp. 122-131
Author(s):  
V.N. Gadalov ◽  
V.R. Petrenko ◽  
E.A. Filatov ◽  
I.V. Vornacheva ◽  
V.E. Dedenko
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Thermal Analysis ◽  
Grain Size ◽  
Physicomechanical Properties ◽  
Titanium Carbonitride ◽  
Structure And Properties ◽  
Critical Temperatures ◽  
Heat Temperature ◽  
Structure Phase

A study of the structure and properties of castings made with the use of various modifiers has been carried out. It was found that when the alloys are modified with titanium carbonitride and all used modifiers except tungsten carbide, the grain size decreases, and carbide precipitates are evenly distributed, contributing to an increase in mechanical properties. Using the method of differential thermal analysis, the critical temperatures at which phase transformations occur in the cast ZhS3DK alloy and its analogs with modifiers have been established. The modes of heat treatment of modified cast heat-resistant alloys of the ZhS3DK type have been specified.

Structural Evolution of Fe Rich Fe-Al Alloys During Ball Milling and Subsequent Heat Treatment

1996 ◽  
Vol 457 ◽  
Author(s):  
H. G. Jiang ◽  
R. J. Perez ◽  
M. L. Lau ◽  
E. J. Lavernia
Keyword(s):  
Heat Treatment ◽  
Solid Solution ◽  
Ball Milling ◽  
Structural Evolution ◽  
Al Alloys ◽  
Avrami Equation ◽  
Transformation Kinetics ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Kinetics Of

ABSTRACTX-ray diffraction (XRD) and differential scanning calorimetry (DSC) have been utilized to investigate the structural evolution of Fe rich Fe-Al alloys during ball milling. It is found that b.c.c. solid solutions can be formed either through ball milling alone or through ball milling together with heat treatment. Thermal diagrams of the milled Fe-Al powders reveal exothermic peaks corresponding to the formation of cc-Fe(Al) solid solution (in both Fe-4wt.%Al and Fe-10wt.%Al) and the formation of FeAl intermetallic compound (in Fe-10wt.%Al). The transformation kinetics of cc-Fe(Al) solid solution in Fe-4wt.%Al were found to follow the Johnson-Mehl-Avrami equation.

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