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 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

Structural-Phase State of UFG-Titanium Implanted with Aluminum Ions

2020 ◽  
Vol 303 ◽  
pp. 161-168
Author(s):  
Alisa V. Nikonenko ◽  
Natalya A. Popova ◽  
E.L. Nikonenko ◽  
M.P. Kalashnikov ◽  
I.A. Kurzina
Keyword(s):  
Grain Size ◽  
Yield Stress ◽  
Phase State ◽  
Structural Phase ◽  
Ion Source ◽  
Anisotropy Factor ◽  
Structural Phase State ◽  
Aluminum Ions ◽  
Average Grain Size ◽  
Before And After

Transmission electron microscopy investigations were carried out to study the structural-phase state of ultra-fine grain (UFG) titanium with the average grain size of ~0.2 μm, implanted with aluminum ions. Implantation was carried out on MEVVA-V.RU ion source at room temperature, exposure time of 5.25 h and ion implantation dosage of 1⋅1018 ion/cm2. UFG-titanium was obtained by a combined multiple uniaxial compaction with rolling in grooved rolls and further annealing at 573 К for 1h. The specimens were investigated before and after implantation at a distance of 70-100 nm from the specimen surface. Concentration profile of aluminum implanted with α-Ti was obtained. It was revealed that the thickness of implanted layer was 200 nm, while maximum aluminum concentration was 70 at.%. Implantation of aluminum into titanium has resulted in formation of the whole number of phases having various crystal lattices, like β-Ti, TiAl3, Ti3Al, TiC and TiO2. The areas of their localization, the sizes, distribution density and volume fractions were determined. Grain distribution functions by their sizes were built, and the average grain size was defined. The paper investigates the influence of implantation on the grain anisotropy factor. It was revealed that implantation leads to the decrease in the average transverse and longitudinal grain size of α-Ti and decrease in the anisotropy factor by three times. The yield stress and contributions of separate strengthening mechanisms before and after implantation were calculated. The implantation has resulted in increase in the yield stress by two times.

Grain Size and Strength of the Ni3Al Intermetallic Compound Synthesized under Pressure

2021 ◽  
Vol 313 ◽  
pp. 41-49
Author(s):  
Vladimir Ovcharenko ◽  
Alexander Kozulin ◽  
K.O. Akimov
Keyword(s):  
Grain Size ◽  
Tensile Strength ◽  
Intermetallic Compound ◽  
Stoichiometric Composition ◽  
Strength Properties ◽  
Grain Structure ◽  
Significant Shift ◽  
Anomalous Temperature ◽  
High Temperature Synthesis ◽  
Transmission Electron

This paper presents the results of the investigation of the grain structure formation in the intermetallic compound Ni3Al under conditions of its high-temperature synthesis under pressure in a powder mixture of nickel and aluminum of stoichiometric composition and the effect of grain size on the strength properties of the synthesized intermetallic compound. The grain structure was investigated by optical metallography, transmission electron microscopy, and EBSD analysis; the ultimate tensile strength of the intermetallic compound was investigated under the tension of the samples in the temperature range from 20 to 1000 °C. It was found that with a decrease in the grain size, not only does the tensile strength of the intermetallic compound multiply increases but also on the anomalous temperature dependence of the intermetallic compound strength there is a significant shift in the maximum strength value to the region of higher temperatures.

Features of Regularities of Ni3Al Intermetallic Compound High-Temperature Synthesis in a Powder Mixture (3Ni + Al) under Pressure

2018 ◽  
Vol 938 ◽  
pp. 41-45
Author(s):  
K.O. Akimov ◽  
E.N. Boyangin ◽  
Vladimir E. Ovcharenko
Keyword(s):  
High Temperature ◽  
Intermetallic Compound ◽  
Powder Mixture ◽  
Exothermic Reaction ◽  
Strength Properties ◽  
Grain Structure ◽  
Temperature Synthesis ◽  
Compound Formation ◽  
High Temperature Synthesis ◽  
Intermetallic Compound Formation

The results of investigation of the time and power parameters influence of high-temperature synthesis under pressure on the grain structure formation and strength properties of the Ni3Al intermetallic compound are presented and discussed. Dependences of the grain size in the intermetallic compound synthesized under pressure and its strength properties on the value of the preload on the initial powder mixture (3Ni + Al) and on the delay time of pressure application to the thermoreacting system were determined from the time of initiation of intermetallic compound formation volumetric exothermic reaction.

Influence of implantation on the grain size and structural-phase state of UFG-titanium

2019 ◽  
Author(s):  
Alisa Nikonenko ◽  
Natalya Popova ◽  
Elena Nikonenko ◽  
Mark Kalashnikov ◽  
Irina Kurzina
Keyword(s):  
Grain Size ◽  
Phase State ◽  
Structural Phase ◽  
Structural Phase State

scholarly journals Influence of W Addition on Microstructure and Mechanical Properties of Al-12%Si Alloys

Materials ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 981 ◽  
Author(s):  
Anna Zykova ◽  
Nikita Martyushev ◽  
Vadim Skeeba ◽  
Denis Zadkov ◽  
Andrey Kuzkin
Keyword(s):  
Mechanical Properties ◽  
Uniform Distribution ◽  
Phase State ◽  
Structural Phase ◽  
Strength Properties ◽  
Chemical Compositions ◽  
Structural Phase State ◽  
Eutectic Si ◽  
Homogeneous Formation ◽  
Time Decrease

A widespread method exerting the influence on the homogeneous formation of the microstructure and enhancement of strength properties of Al-Si alloys is a modification by super- and nanodispersed particles of different chemical compositions. In spite of the significant advances in the studies of the influence of various modifying compositions on the structure and mechanical properties of casted silumins, the literature contains no data about the influence of nanodispersed W-powder on formation of the structural-phase state and mechanical properties of Al-Si alloys. The paper considers the influence of 0.01–0.5 mass % W nanopowder on the structural-phase state and mechanical properties of an Al-12%Si alloy. It has been established that 0.1 mass % of W is an optimal addition. It results in the uniform distribution of eutectic (α-Al + Si), a 1.5-time decrease in the size of the plates of eutectic Si, a change of the shape of coarse plates (coarse plate-like or acicular) into a fine fibrous one, and an enhancement of the mechanical properties by 16–20%.

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.

Influence of the Initial Grain Size on the Structural-Phase State of the VT20 Titanium Alloy Surface after Implantation

2021 ◽  
Vol 1037 ◽  
pp. 535-540
Author(s):  
Viktor Vasilevich Ovchinnikov ◽  
Irina Aleksandrovna Kurbatova ◽  
Elena Vladimirovna Luk'yanenko ◽  
Nadezda Vladimirovna Uchevatkina ◽  
Svetlana Viktorovna Yakutina
Keyword(s):  
Grain Size ◽  
Titanium Alloy ◽  
Phase State ◽  
Structural Phase ◽  
Alloy Surface ◽  
Structural Phase State ◽  
Fine Grained ◽  
Ultrafine Grained ◽  
Alloy Vt20 ◽  
Vt20 Titanium Alloy

The article presents the results of studies of titanium alloy VT20 in ultrafine-grained (UFG), subfine-grained (SMG), fine-grained (MZ) and mesopolycrystalline (MPC) states, obtained, including by methods of plastic deformation and subsequently subjected to ion implantation. The effect of grain size on the structural-phase state of the titanium alloy surface and mechanical properties is shown.

Sign in / Sign up

Export Citation Format

Share Document