scholarly journals INFLUENCE OF HIGH-VELOCITY IMPACT PARAMETERS ON THE STRUCTURE AND PROPERTIES OF THE VT1-0 + AMG5 JOINT

2021 ◽  
pp. 28-33
Author(s):  
M. P. Korolev ◽  
E. V. Kuzmin ◽  
S. V. Kuzmin ◽  
V. I. Lysak
Keyword(s):  
Pure Aluminum ◽  
Peel Strength ◽  
Mechanical Tests ◽  
Explosion Welding ◽  
Minimal Energy ◽  
High Velocity Impact ◽  
Structure And Properties ◽  
Joint Zone ◽  
Alloy Amg5 ◽  
Melted Metal

The paper presents the results of studying the joints of VT1-0 titanium with the aluminum-magnesium alloy AMg5, obtained by explosion welding in different modes of impact. The analysis of microstructures showed that, depending on the conditions of collision, the boundary of the joint zone can have both a wave and a waveless profile. Areas of melted metal are formed even with minimal energy input, but until a certain point they do not significantly affect the strength of the joint. At relatively low values of the energy W, titanium weakly dissolves in aluminum and is present in the melted areas in the form of crushed particles. A further increase in the modes of explosion welding leads to an increase in the degree of dissolution of titanium in melts, which is accompanied by the appearance of cracks. The results of the performed mechanical tests showed that the values of the peel strength of the layers are noticeably higher and reach an equal-strength joint in comparison with the method of welding through an intermediate layer of pure aluminum. In the investigated range of welding modes, the strength of the joint increases in the energy range W = 0,85...1,1 MJ/m, and at W = 1,1 MJ/m it reaches a maximum. With a further increase in the modes of explosion welding, the strength of the joint decreases, which is associated with a change in the structure of the melted regions with the formation of brittle intermetallics in them.

scholarly journals FEATURES OF FORMING THE VT1-0+AMG5 JOINT DURING EXPLOSION WELDING WITH THE INFLUENCE OF ACOUSTIC VIBRATIONS

2021 ◽  
pp. 28-38
Author(s):  
M. P. Korolev ◽  
E. V. Kuz’min ◽  
S. V. Kuz’min ◽  
V. I. Lysak ◽  
D. V. Donskoy ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Comparative Study ◽  
Conventional Method ◽  
Surface Preparation ◽  
Explosion Welding ◽  
Acoustic Vibrations ◽  
Joint Zone ◽  
Microstructure And Mechanical Properties ◽  
Positive Effect ◽  
Melted Metal

The work is devoted to the study of the influence of the introduction of acoustic vibrations during explosion welding of the VT1-0 + AMg5 pair. A comparative study of joints obtained by the conventional method of explosion welding and explosion welding with the effect of acoustic vibrations in various welding modes has been carried out. The results of the study of the microstructure and mechanical properties allow us to speak about the positive effect of the introduction of acoustic vibrations during welding VT1-0 + AMg5, which consists in expanding the weldability area and reducing the volume of the melted metal in the joint zone. It is also shown in the work that the nature of surface preparation before welding can have a significant effect on the strength of the joint.

scholarly journals The Effect of Nanometric α-Al2O3 Addition on Structure and Mechanical Properties of Feal Alloys Fabricated by Lens Technique

2017 ◽  
Vol 62 (3) ◽  
pp. 1703-1712 ◽  
Author(s):  
M. Łazińska ◽  
T. Durejko ◽  
W. Polkowski
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Intermetallic Alloy ◽  
First Principle ◽  
Metal Pool ◽  
Structure And Properties ◽  
Indirect Methods ◽  
Α Al2o3 ◽  
Melted Metal

AbstractResults of the first principle study on a fabrication of FeAl intermetallic based alloy with an addition of nanometric αAl2O3(n-Al2O3) particles by the LENS method and a subsequent characterization of the as received materials’ structure and properties, are shown in the present work. A series of samples were manufactured using LENS technique while a control of temperature and the size of melted metal pool. The presence of ceramics nanoparticles was not directly confirmed by microscopy observations. Neither aluminum nor oxygen content was not elevated in the material with n-Al2O3content. Although, indirect methods revealed influence of n-Al2O3addition on the manufactured elements structure. Analyses of porosity has shown that addition of 2% vol. n-Al2O3significantly decreases this feature (~1%), as compared to the reference material made of pure FeAl intermetallic alloy (~5%). The addition of n-Al2O3causes an increase of grain size in Fe40Al intermetallic alloy. An oxidation resistance has been also improved what was associated to the n-Al2O3addition. Four times lower increase of samples mass was noticed for sample with the n-Al2O3addition as compared to the pure Fe40Al intermetallic alloy.

Organophilic Layered Silicate Modified Vinylester-Urethane Hybrid Resins: Structure and Properties

2008 ◽  
Vol 16 (8) ◽  
pp. 547-554
Author(s):  
M.-C. Corobea ◽  
D. Donescu ◽  
S. Grishchuk ◽  
N. Castellà ◽  
A.A. Apostolov ◽  
...  
Keyword(s):  
Layered Silicate ◽  
Compact Tension ◽  
Mechanical Tests ◽  
Layered Silicates ◽  
Sorption Behavior ◽  
Structure And Properties ◽  
Quaternary Amine ◽  
X Ray ◽  
Hybrid Resin ◽  
Crosslinking Reactions

A commercial vinylester-urethane (VEUH) hybrid resin was modified with organophilic layered silicates (OLS), incorporated in various amounts (0.1 to 5 wt.%). As organophilic intercalants of the layered silicate (synthetic fluorohectorite) trimethyl dodecylamine (TMDA) and octadecylamine - N,N-bis[allyl(2-hydroxypropyl)ether] (OAE) served. The latter quaternary amine was expected to support the intercalation/exfoliation of the silicate by participating in the crosslinking reactions. Both OLS types became intercalated based on X-ray diffractograms (XRD). Dynamic-mechanical thermal analysis (DMTA) displayed a slight increase in the stiffness by adding OLS up to 2.5 wt.%. However, at 5wt% OLS content the stiffness of the nanocomposites was below that of the unfilled hybrid resin. The glass transition temperature (Tg) did not change practically with the OLS type and content. Fracture mechanical tests were performed on compact tension (CT) specimens. The fracture toughness (Kc) increased slightly, while the fracture energy (Gc) markedly with increasing OLS content. Unexpectedly, TMDA proved to be a more suitable intercalant than OAE. The failure mode of the specimens was studied in a scanning electron microscope (SEM) and discussed. In addition, the water sorption behavior of the OLS modified VEUHs was determined and the diffusion coefficients (D) deduced.

Explosion Joining of Magnesium Alloy AZ31 and Aluminum

2007 ◽  
Vol 566 ◽  
pp. 291-296 ◽  
Author(s):  
Seyed Hadi Ghaderi ◽  
Akihisa Mori ◽  
Kazuyuki Hokamoto
Keyword(s):  
Room Temperature ◽  
Chemical Reactivity ◽  
Pure Aluminum ◽  
Weld Interface ◽  
Explosion Welding ◽  
Shear Tests ◽  
Dissimilar Joints ◽  
Commercially Pure ◽  
Hcp Structure ◽  
Zn Alloy

Explosion welding has produced a large number of dissimilar joints. But the explosion welding of materials of low impact toughness and brittle nature is considered to be difficult. Magnesium, with its HCP structure, has a low capacity for plastic deformation at room temperature and moreover it has a high chemical reactivity. Therefore, successful explosion welding of magnesium alloys, demands careful attention to be paid to prevent failure or formation of brittle reacted zones at the weld interface. Explosive welding of the wrought Mg-Al-Zn alloy and commercially pure aluminum is performed. The welds are analyzed through metallographic characterization and shear tests. High quality welds of the two materials possessing shear strength higher than the softer layer has been obtained.

Investigation of Interface Morphology and Properties of Aluminum and Copper Samples Obtained by Ultrasound-Assisted Explosive Welding

2017 ◽  
Vol 746 ◽  
pp. 240-245 ◽  
Author(s):  
Evgeniy V. Kuz’min ◽  
Alexander P. Peev ◽  
S.V. Kuz’min ◽  
V.I. Lysak
Keyword(s):  
High Frequency ◽  
Explosive Welding ◽  
Explosion Welding ◽  
Simultaneous Action ◽  
Ultrasonic Vibrations ◽  
Structure And Properties ◽  
Interface Morphology ◽  
Simultaneous Treatment ◽  
High Frequency Vibrations ◽  
Ultrasound Assisted

This paper presents the results of the effect of ultrasound on explosion welded materials. It was found that simultaneous treatment with ultrasonic vibrations and explosion welding of the materials to be welded has a significant effect on the structure and properties of the heat-affected zone of formed aluminum and copper joints. It has been experimentally proved that the change in the sizes and structure of the weld junction during explosion welding using high-frequency vibrations is a result of the simultaneous action of these processes at the stage of joint formation and hardly depends on the structure of the material.

scholarly journals X-RAY STUDIES OF COMPOSITE MATERIAL STEEL 20 - STAINLESS STEEL 50CR15MO2V AFTER EXPLOSION WELDING AND NORMALIZATION

2021 ◽  
pp. 26-31
Author(s):  
V. N. Arisova ◽  
A. F. Trudov ◽  
A. I. Bogdanov ◽  
A. E. Birshbaeva ◽  
M. A. Razuvaev
Keyword(s):  
Heat Treatment ◽  
Stainless Steel ◽  
Composite Material ◽  
Fine Structure ◽  
Martensitic Transformation ◽  
Coherent Scattering ◽  
Explosion Welding ◽  
Joint Zone ◽  
X Ray ◽  
Steel 20

The results of studies of the characteristics of the fine structure of a bimetal made of stainless steel 50Kh15M2F and carbon steel 20 after explosion welding and subsequent heat treatment in the joint zone are presented. It was found that normalization at temperatures above 900 ° C leads to a martensitic transformation in steel 50Cr15Мo2V, which is accompanied by an increase in hardness and the development of a fine structure: an increase in the level of elastic deformation of the crystal lattice and fragmentation of coherent scattering regions.

scholarly journals THE EFFECT OF CEMENT ADDITIVES IN PVC MATERIALS

2017 ◽  
Vol 5 (11) ◽  
pp. 206-209
Author(s):  
Kitti Ungai
Keyword(s):  
Mechanical Properties ◽  
Fire Resistance ◽  
Oxygen Index ◽  
Industrial Area ◽  
Mechanical Tests ◽  
Structure And Properties ◽  
Hardness Tests ◽  
Result Show ◽  
Rigid Pvc ◽  
Index Value

The aim of the present paper is to show the effect of cement modifier behaviors in PVC materials. The PVC and the Portland cement are important materials in the industrial area. It can reach excellent properties if mixing the two materials with each other.  The cement worked as filler in PVC, as shown the mechanical tests. The oxygen index was determined, accordingly the result show higher oxygen index value. That means the blend shows higher fire resistance comparing to neat PVC. The cement worked as a structural modifier, it caused modification in the blends structure and properties. From the mechanical tests, such as impact-, tensile-, flexural- and hardness tests the blend gives similar mechanical properties to neat PVC. The research presented in this paper shows that the cement mixed with PVC shows higher stability, fire resistance and similar mechanical properties as rigid PVC.

scholarly journals A New Approach Based on Glued Multi-Ultra High Molecular Weight Polyethylene Forms to Fabricate Bone Replacement Products

Polymers ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2545
Author(s):  
Tarek Dayyoub ◽  
Aleksey Maksimkin ◽  
Fedor Senatov ◽  
Sergey Kaloshkin ◽  
Natalia Anisimova ◽  
...  
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Phenol Formaldehyde ◽  
Peel Strength ◽  
Mechanical Tests ◽  
Cortical Layer ◽  
Compressive Yield Strength ◽  
Ene Reaction ◽  
Promising Development ◽  
Ultra High Molecular Weight

Three types of glue based on thiol-ene reaction, polyvinyl alcohol (PVA)/cellulose, and phenol formaldehyde were prepared and applied on modified ultra-high molecular weight polyethylene (UHMWPE) samples grafted by cellulose. In comparison with unmodified UHMWPE samples, T-peel tests on the modified and grafted UHMWPE films showed an increase in the peel strength values for the glues based on thiol-ene reaction, PVA/cellulose, and phenol formaldehyde by 40, 29, and 41 times, respectively. The maximum peel strength value of 0.62 Kg/cm was obtained for the glue based on phenol formaldehyde. Mechanical tests for the cylindrical multi-UHMWPE forms samples, made of porous UHMWPE as a trabecular layer and an armored layer (cortical layer) that consists of bulk and UHMWPE films, indicated an improvement in the mechanical properties of these samples for all glue types, as a result of the UHMWPE films existence and the increase in the number of their layers. The maximum compressive yield strength and compressive modulus values for the armored layer (bulk and six layers of the UHMWPE films using the glue based on thiol-ene reaction) were 44.1 MPa (an increase of 17%) and 1130 MPa (an increase of 36%), respectively, in comparison with one armored layer of bulk UHMWPE. A hemocompatibility test carried out on these glues clarified that the modified UHMWPE grafted by cellulose with glues based on PVA/cellulose and thiol-ene reaction were classified as biocompatible materials. These multi-UHMWPE forms composites can be considered a promising development for joint reconstruction.

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