Effect of thermocycling on the temperatures of phase transformations, structure, and properties of the equiatomic alloy Ti50.0Ni50.0

2016 ◽  
Vol 117 (1) ◽  
pp. 99-106 ◽  
Author(s):  
A. A. Churakova ◽  
D. V. Gunderov
Keyword(s):  
Phase Transformations ◽  
Structure And Properties ◽  
Temperatures Of Phase Transformations ◽  
Equiatomic Alloy

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

2020 ◽  
pp. 435-445
Author(s):  
V.N. Gadalov ◽  
I.A. Makarova ◽  
A.A. Ivanov ◽  
S.N. Kutepov ◽  
A.V. Filonovich ◽  
...  
Keyword(s):  
Treatment Condition ◽  
Heat Treatment Condition ◽  
Physicomechanical Properties ◽  
Titanium Carbonitride ◽  
Structure And Properties ◽  
Analysis Method ◽  
Critical Temperatures ◽  
Heat Temperature ◽  
Thermal Analysis Method ◽  
Temperatures Of Phase Transformations

The structure and properties of castings obtained using various modifi ers are studied. It is shown that the introduction of multicomponent modifi er containing ultrafi ne powders of titanium carbide, titanium carbonitride leads to decrease in grain, uniform distribution of carbide precipitates and increase in mechanical properties. The critical temperatures of phase transformations in the cast ZhS3DK alloy and its analogue with modifi ers are determined by the differential thermal analysis method. The heat treatment condition of modifi ed cast heattemperature alloys of the ZhS3DK type is corrected.

Study of Phase Transformation in Alloys of the Al-Fe System

2012 ◽  
Vol 326-328 ◽  
pp. 573-577 ◽  
Author(s):  
Magdalena Jabłońska ◽  
Marta Mikuśkiewicz ◽  
Anna Śmiglewicz ◽  
E. Bernstock-Kopaczyńska
Keyword(s):  
Thermal Analysis ◽  
Solid Solution ◽  
Phase Transformation ◽  
Phase Transformations ◽  
Order Type ◽  
Point Of View ◽  
Gravity Casting ◽  
Mechanical And Physical Properties ◽  
Temperatures Of Phase Transformations ◽  
Alloys Of The Al

In this paper, phase transformation in alloys of the Al-Fe and Al-Fe-Cr systems was investigated. The alloys were prepared by melting and gravity casting. The studies of phase transformation were carried out on samples after casting and annealing, using the differential thermal analysis (DTA) and dilatometric method. The knowledge on the phase transformations in these alloys including the information about order-disorder transition is very important from the point of view of obtained mechanical and physical properties of alloys of the Al-Fe system. These results are an important contribution in development of knowledge on iron aluminides. In the article, temperatures of phase transformations connected with a change in order type and transition into disordered solid solution were defined. Conformity of the recorded DTA results and dilatometric analysis was achieved.

Phase transformations in equiatomic alloy TiZr at pressure up to 70 kbar

2000 ◽  
Vol 42 (1) ◽  
pp. 170-176 ◽  
Author(s):  
I. O. Bashkin ◽  
A. Yu. Pagnuev ◽  
A. F. Gurov ◽  
V. K. Fedotov ◽  
G. E. Abrosimova ◽  
...  
Keyword(s):  
Phase Transformations ◽  
Equiatomic Alloy

scholarly journals Physical Properties Of Rare Earth Elements

2021 ◽  
Vol 03 (01) ◽  
pp. 79-88
Author(s):  
Davron Rakhmonovich Djuraev ◽  
◽  
Mokhigul Madiyorovna Jamilova ◽  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Physical Properties ◽  
Phase Transformations ◽  
Rare Earth Metals ◽  
Economic Effect ◽  
Structure And Properties ◽  
Structure And Stability ◽  
Ongoing Phase

The article studies the physical properties of rare earth metals, pays special attention to their unique properties, studies the main aspects of the application of rare earth metals in industry. Also, the structure and stability of various forms of sesquioxides of rare earth elements, in particular, europium, as well as the effect of the method of oxide preparation on its structure and properties are considered. The analysis of the ongoing phase transformations of rare earth metals is made. The article emphasizes the use of correct choices to achieve a large technical and economic effect when using rare earth metals in industry. The article is intended for teachers working in the field of physics and chemistry, as well as for students of the specialty "physics and chemistry".

scholarly journals ENSURING THE EFFICIENT OPERATION OF FRICTION UNITS IN THE CONTEXT OF SELECTING FUNCTIONALLY HIGH QUALITY OILS

2021 ◽  
pp. 59-71
Author(s):  
V.I. Kyrychenko ◽  
V.V. Kyrychenko ◽  
V.P. Nezdorovin ◽  
A.I. Stremetskyi
Keyword(s):  
Phase Transformations ◽  
Surface Activity ◽  
Friction And Wear ◽  
Steel Surface ◽  
Structure And Properties ◽  
Surface Layers ◽  
Efficient Operation ◽  
X Ray ◽  
Friction Units ◽  
Steel Surfaces

The article reflects certain applied aspects of a new direction of energy — biosynthetic energy sources, such as bio-oils obtained from technical oils. In particular, there are considered results of the research of the influence of such a characteristic factor of base oils and, first of all, bio-oils as their surface activity on energy efficiency and reliability of operation of friction units lubricated by them under the conditions of the boundary regime of friction. It is proved that the surface activity of oils as an indicator of their functional quality is due to the peculiarities of the structure and properties of their molecules, the energy fields of which evoke certain tribochemical interactions with triboactivated nano-surfaces of friction steels. Separate provisions for evaluating the effect of the tribochemical activity of oils on the process of modifying the steel surfaces of functioning friction units have been formed. The essence of X-ray examination of the influence of lubricating media on the condition of the steel surface by the method of a sliding X-ray beam, analyzing the surface layers with a depth of 0.5–7 mkm. The effect of significant influence of bio-oils obtained from oils on the phase transformations of the structure and properties of the steel surface during tribe tests of samples on friction and wear is revealed. It is established that the effect of obtaining the crystal structure of steel with surface hardening under the deformed layer depends on the tribochemical activity of the proposed three lubricating compositions, which are characterized by the algorithmic growth of such activity. It is proved that the tribochemical activity of bio-oils (in compositions 2 and 3, estimated by the intensity of phase transformations in the surface layers (the effect of Rebinder PO), leads, in turn, to improved friction and wear of lubricated samples compared to the composition 1 low triboactivity. X-structural surfaces analysis of the samples of steel 45 in the initial state and after testing in the media of each of the compositions showed that in the friction processes there is a destruction of the structure of austenite with the release of α-phase (ferrite). It is shown that the intensity of such modification of steel surfaces is progressively amplified in samples lubricated with compositions in accordance with their increasing triboactivity. It was found that with the penetration into the surface layers of steel (from 0.5 to 7 mkm), lubricated with bio-oils of the samples after their tribometer tests, the amount of ferrite increases and the content of austenite decreases. This reduces the deformability of the structure of metal crystals, which leads to the strengthening of its surface under its plasticized layer, and hence the reduction of friction and wear due to the formed intersurface servito-tribopolymer film, resistant to friction. Bibl. 12, Fig. 5, Tab. 3.

Interaction in the systems Y2O3−Ln2O3 (Ln=Tb–Lu)

2021 ◽  
Vol 2021 (2) ◽  
pp. 72-78
Author(s):  
A. O. Makudera ◽  
◽  
S. M. Lakiza ◽  
Keyword(s):  
Phase Transformations ◽  
Phase Diagrams ◽  
Solid Solutions ◽  
System Component ◽  
Polymorphic Transformations ◽  
Lanthanide Oxides ◽  
Solid States ◽  
Polymorphic Modifications ◽  
Temperatures Of Phase Transformations ◽  
Binary Compounds

Based on the analysis of literature data from experimentally constructed phase diagrams of Y2O3 − Ln2O3 systems (Ln = Tb − Lu), as well as temperatures of polymorphic transformations of rare earth oxides (REE), tentative phase diagrams of Y2O3 − Ln2O3 systems (Ln = Tb − Lu) were constructed in wide intervals of temperatures and concentrations. Prediction of the binary phase diagrams structure of yttria − yttrium subgroup lanthanides systems was carried out on the basis of three principles: 1. Since double systems are formed by lanthanide oxides of one (yttrium) subgroup, it is very likely that in such systems continuous solid solutions will be formed between the components. 2. Intermediate binary phases are not formed in these systems. 3. The formation of continuous solid solutions occurs with a decrease in the temperatures of phase transformations in the solid state to a minimum shifted towards a lower transformation temperature of the system component. The forecast of the Y2O3 – Ln2O3 systems phase diagrams structure, where Ln = Tb – Lu, indicates the complete solubility of the components in the liquid and solid states. Binary compounds in the considered systems are not predicted. Phase transformations in the solid solutions on the basis of polymorphic modifications X, H, A, B and C of lanthanide oxides cascade at high temperatures by the peritectoid mechanism. Below 1850 °C regions of solid solutions with cubic C-structure of REE oxides are formed in the whole range of concentrations in the systems. Key words: REE oxides, yttria, polymorphs of REE oxides, phase diagram.

Formation of the structure and properties of Cu-Pd alloys during the A1-B2 phase transformations

2008 ◽  
Vol 106 (4) ◽  
pp. 341-352
Author(s):  
A. Yu. Volkov ◽  
V. A. Kazantsev ◽  
N. I. Kourov ◽  
N. A. Kruglikov
Keyword(s):  
Phase Transformations ◽  
Structure And Properties ◽  
B2 Phase

Texture Evidences of Interaction between Plastic Deformation and Phase Transformations in Zr-Based Alloys

2011 ◽  
Vol 702-703 ◽  
pp. 283-286 ◽  
Author(s):  
Yuriy Perlovich ◽  
Margarita Isaenkova ◽  
Vladimir Fesenko ◽  
Olga Krymskaya
Keyword(s):  
Phase Diagram ◽  
Plastic Deformation ◽  
Phase Transformation ◽  
Phase Transformations ◽  
Thermal Effects ◽  
Lattice Stability ◽  
Fine Grained ◽  
Interphase Boundaries ◽  
Fine Grained Structure ◽  
Temperatures Of Phase Transformations

Abstract. Features of the texture development in Zr-based alloys under compression at tempera-tures of the (α+β)-region of the Zr-Nb phase diagram indicate that the plastic deformation shifts temperatures of phase transformations due to accompanying thermal effects and the decrease of lattice stability, whereas formation of the fine-grained structure by phase transformation promotes activation of the non-crystallographic deformation mechanism of slip by interphase boundaries.

scholarly journals Investigations of Temperatures of Phase Transformations of Low-Alloyed Reinforcing Steel within the Heat Treatment Temperature Range

2017 ◽  
Vol 62 (2) ◽  
pp. 891-897 ◽  
Author(s):  
T. Kargul
Keyword(s):  
Phase Transformations ◽  
Treatment Temperature ◽  
Protective Atmosphere ◽  
Eutectoid Transformation ◽  
Dsc Analysis ◽  
Temperature Range ◽  
Proeutectoid Ferrite ◽  
Temperatures Of Phase Transformations ◽  
Tempcore Process

AbstractThe paper presents the results of DSC analysis of steel B500SP produced in the process of continuous casting, which is intended for the production reinforcement rods with high ductility. Studies were carried out in the temperature range below 1000°C in a protective atmosphere of helium during samples heating program. The main objective of the study was to determine the temperature range of austenite structure formation during heating. As a result of performed experiments:Ac1s,Ac1f– temperatures of the beginning and finish of the eutectoid transformation,Ac2– Curie temperature of the ferrite magnetic transformation and the temperature Ac3of transformation of proeutectoid ferrite into austenite were elaborated. Experimental determination of phase transformations temperatures of steel B500SP has great importance for production technology of reinforcement rods, because good mechanical properties of rods are formed by the special thermal treatment in Tempcore process.

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