Features of High-Temperature Synthesis in Clad Mechanocomposites of Ti-Al System

2021 ◽  
Vol 410 ◽  
pp. 348-352
Author(s):  
Aleksei V. Sobachkin ◽  
Marina V. Loginova ◽  
Valery Yu. Filimonov
Keyword(s):  
Ignition Temperature ◽  
Ball Mill ◽  
Deposition Time ◽  
Phase State ◽  
Structural Phase ◽  
Temperature Synthesis ◽  
Structural Phase State ◽  
Aluminum Powders ◽  
High Temperature Synthesis ◽  
Start Temperature

The influence of mechanoactivated reagents cladding on the structural-phase state of the SHS-products was investigated. Titanium and aluminum powders were used as reagents. Mechanical activation was performed on the AGO-2 planetary ball mill. The coating on Ti+Al mechanocomposite was carried out using magnetron installation “VSE-PVD-Power”. At deposition time of 40 minutes, the reaction start temperature increases from 525 °C to 648 °C (compared to reagents without cladding). It can be assumed that an increase in the thickness of the deposited SiO2 film serves as a barrier to the reaction start, thereby increasing ignition temperature. Apart from pretreatment, the phase composition of the final product contains intermetallic compounds TiAl, TiAl3, Ti3Al5, as well as the small amount of residual Ti. The main phase is TiAl.

Structural-Phase State and Strength Properties of Pressure-Synthesized Ni3Al Intermetallic Compound

2017 ◽  
Vol 906 ◽  
pp. 95-100 ◽  
Author(s):  
V.E. Ovcharenko ◽  
E.N. Boyangin ◽  
A.P. Pshenichnikov ◽  
T.A. Krilova
Keyword(s):  
Grain Size ◽  
Intermetallic Compound ◽  
Powder Mixture ◽  
Delay Time ◽  
Phase State ◽  
Structural Phase ◽  
Strength Properties ◽  
Synthesis Product ◽  
Structural Phase State ◽  
High Temperature Synthesis

The article studies dependences of grain size in Ni3Al intermetallic compound synthesized under pressure in 3Ni+Al powder mixture in conditions of bulk exothermal reaction upon pre-pressure acting on the powder mixture and upon a delay time of applying pressure to a high-temperature synthesis product. It is proved that an increase in the pre-pressure on the parent powder mixture reduces the grain size, and an increase in the delay time increases the grain size in the synthesized intermetallic compound. Reducing the grain size from 10 to 1.75μm increases the strength of the intermetallic compound under pressure from 336 to 482 MPa (1.4 times).

Influence of composition on the structural-phase state, electrophysical and magnetotransport properties of alloy thin films based on Co and Cu

Vacuum ◽  
2021 ◽  
Vol 187 ◽  
pp. 110141
Author(s):  
I.O. Shpetnyi ◽  
I.Yu Protsenko ◽  
S.I. Vorobiov ◽  
V.I. Grebinaha ◽  
L. Satrapinskyy ◽  
...  
Keyword(s):  
Thin Films ◽  
Phase State ◽  
Structural Phase ◽  
Structural Phase State

Influence of ball milling duration on the morphology, features of the structural-phase state and microhardness of 3Ni-Al powder mixture

2021 ◽  
Author(s):  
Ivan A. Ditenberg ◽  
Denis A. Osipov ◽  
Michail A. Korchagin ◽  
Ivan V. Smirnov ◽  
Konstantin V. Grinyaev ◽  
...  
Keyword(s):  
Ball Milling ◽  
Powder Mixture ◽  
Phase State ◽  
Structural Phase ◽  
Structural Phase State ◽  
Milling Duration ◽  
Al Powder

Effect of Alloying Elements on the Structural Phase State of Hadfield Steel

2021 ◽  
Vol 33 (11) ◽  
pp. 04021324
Author(s):  
Almira Zhilkashinova ◽  
Mazhyn Skakov ◽  
Madi Abilev ◽  
Dossym Yerbolatuly
Keyword(s):  
Phase State ◽  
Structural Phase ◽  
Alloying Elements ◽  
Hadfield Steel ◽  
Structural Phase State ◽  
Effect Of Alloying

scholarly journals Influence of electrolytic plasma nitriding mode on structural phase state of pearlitic steel

2018 ◽  
Vol 143 ◽  
pp. 03004
Author(s):  
Natalya Popova ◽  
Lyudmila Erygina ◽  
Elena Nikonenko ◽  
Mazhin Skakov
Keyword(s):  
Phase State ◽  
Plasma Nitriding ◽  
Water Solution ◽  
Lath Martensite ◽  
Structural Phase ◽  
Pearlitic Steel ◽  
Parallel Plates ◽  
Structural Phase State ◽  
Original State ◽  
Α Phase

The paper describes results of studies of phase transitions in structural phase state occurring in the type 0.34C-1Cr-1Ni-1Mo-Fe steel under electrolytic plasma nitriding in nitrogen-containing water solution. The nitriding voltages considered in the given study were 550 and 600 V. The research was conducted by means of X-ray diffraction electron microscopy. The specimens were studied in two states : 1) before modification (original state) and 2) after nitriding in the surface layer of the specimen. The study was conducted on thin foils. It was found that nitriding lead to significant changes in the structure of steel, namely in its phase composition and in the number of existing phases. In the original state the structure of steel was given as lamellar pearlite, ferritic carbide mix and fragmented ferrite. After 550 V nitriding it was lath martensite, plates of α-phase, with colonies of thin parallel plates of γ-phase and coarse grains of α-phase, containing γ-phase grains which were different in size and shape and were various-directional. Increase in nitriding voltage up to 600 V lead to change in the structure given as a lamellar non-fragmented pearlite and fragmented ferrite. The original state was marked by presence of particles of M3C cementite, after nitriding irrespective of the voltage it had the particles of M3C alloyed cementite, Fe3Mo3N nitride and Cr2C0.61N0.39 carbonitride. The sizes, volume fractions and locations of particles were dependent on nitriding voltage.

The structural-phase state and magnetoresistive properties of thin film alloys obtained by co-evaporated Cu and Co

2019 ◽  
Vol 474 ◽  
pp. 624-631 ◽  
Author(s):  
I.O. Shpetnyi ◽  
D.M. Kondrakhova ◽  
S.I. Vorobiov ◽  
B. Scheibe ◽  
V.I. Grebinaha ◽  
...  
Keyword(s):  
Thin Film ◽  
Phase State ◽  
Structural Phase ◽  
Structural Phase State
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