The Influence of Incoherent Particle Size on Defect Structure and Strength Properties of Disperse-hardened Aluminum Alloys

2020 ◽  
Vol 63 (4) ◽  
pp. 688-692
Author(s):  
T. A. Kovalevskaya ◽  
O. I. Daneyko ◽  
T. A. Shalygina
Keyword(s):  
Particle Size ◽  
Aluminum Alloys ◽  
Defect Structure ◽  
Strength Properties

Weldability: Effect of Alloying Element Sc, Mn, and Zr on Alloys of the Al-Mg-Sc-Mn-Zr System

2019 ◽  
Author(s):  
V. I. Lukin
Keyword(s):  
Aluminum Alloys ◽  
Practical Importance ◽  
Strength Properties ◽  
Strength Characteristics ◽  
Mg Alloy ◽  
Alloying Element ◽  
Processing Properties ◽  
Alloys Of The Al ◽  
Effect Of Alloying

Scandium in aluminum alloys behaves as the most efficient modifier of the structure of the material and as an agent suppressing recrystallization. This unique behavior of scandium in alloys of the Al-Mg system greatly increases the strength characteristics, whilst retaining on a higher level the ductility and processing properties of deformed semi-finished products. This article describes the effect of complex alloying the Al-6.3% Mg alloy with scandium, manganese and zirconium on the weldability and strength properties of the material is of considerable scientific and practical importance.Investigations.

scholarly journals Filter Cake Utilization as Filler of 15-15-15+5S Compound Fertilizer: Particle Size Distribution and Granule Crushing Strength Properties

REAKTOR ◽  
2019 ◽  
Vol 19 (4) ◽  
pp. 145-151
Author(s):  
Kasmadi Kasmadi ◽  
Budi Nugroho ◽  
Atang Sutandi ◽  
Syaiful Anwar
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Filter Cake ◽  
Rotation Speed ◽  
Strength Properties ◽  
Inorganic Materials ◽  
Crushing Strength ◽  
Compound Fertilizer ◽  
Potassium Sources

Compound fertilizer which combining organic-inorganic materials need to be developed to improve the effectivness of fertilizers in the soil. Filter cake as a material has highly potential to be used as a filler in physical process granulation of compound fertilizer. In this study, the particle size distribution and granule crushing strength properties were tested using 15-15-15 + 5S fertilizer compound formula, which are varied in the filler composition and K sources. Potassium sources consisted of 2 (two) types of fertilizers i.e KCl and K2SO4. Filler composition as a binder in fertilizer granulation consists of 5 combination filter cake and clay ratios (60:40, 70:30, 80:20, 90:10 and 100:0). Granulation carried out by the granulation method using pan granulator of 2 kg/batch capacity, 23 rpm rotation speed and 50o pan slope. The results of the research showed that statistically the combination of filter cake and clay 70:30 had a size distribution and hardness of granules not significantly different from standard fertilizer (100% clay). Keywords: crushing strength; filler; filter cake; granulation; size distribution

scholarly journals Design of a device for rocks strength properties determining to solve the tasks of rock rock-cutting machines design

2018 ◽  
Vol 224 ◽  
pp. 02084
Author(s):  
Leonid T. Dvornikov ◽  
Viktor A. Korneyev
Keyword(s):  
Particle Size ◽  
Energy Intensity ◽  
Average Particle Size ◽  
Rock Cutting ◽  
Strength Properties ◽  
Rock Massif ◽  
Average Particle ◽  
Mining Engineering ◽  
Rock Destruction ◽  
Cis Countries

The article presents methods for rocks strength properties determining in mining machines engineering in Russia, CIS countries and Europe. It is shown that general drawback of methods considered is lack of possibility of carrying out instant tests at various points in rock massif. Criteria are given for the method of rocks strength properties determining as applied to mining engineering tasks. Based on established criteria, the fundamentally new method has been developed. Technical devices are proposed for the method implementation in testing individual samples and rock massif. Construction of the laboratory stand estimating energy intensity of rock destruction is presented. Relationship between its value, coefficient of strength according to the M.M. scale of Protodyakonov and average particle size of the destroyed rock is shown.

scholarly journals Compressive Strength Properties of Snow

1959 ◽  
Vol 3 (25) ◽  
pp. 345-354
Author(s):  
H. H. G. Jellinek
Keyword(s):  
Carbon Dioxide ◽  
Particle Size ◽  
Compressive Strength ◽  
Chemical Reaction ◽  
Strength Properties ◽  
Measurable Effect ◽  
First Order ◽  
Order Chemical Reaction ◽  
Snow Particle ◽  
First Order Chemical Reaction

AbstractThe compressive strength of snow cylinders was investigated as a function of the age of the snow from which the cylinders were made, the snow particle size and the age of the cylinders. The results show that the compressive strength is reduced if the snow is older, if the particle size is smaller, or if the cylinders are younger. The variation with age of the cylinders can be represented by an equation similar to that for a first-order chemical reaction. The effect of adding small quantities of various gases to the atmosphere in which the cylinders were kept was also investigated; carbon dioxide and methane had no measurable effect, but ammonia lowered the strength of the cylinders. All the strength measurements were carried out at −10° C.

Si Particle Size-Controlled Al-17 Mass% Si Alloy and Tool Wear in Cutting Al-17 Mass% Si Alloy by Polycrystalline Diamond Compact Cutting Tool

2015 ◽  
Vol 798 ◽  
pp. 372-376
Author(s):  
Tadahiro Wada
Keyword(s):  
Particle Size ◽  
Aluminum Alloys ◽  
Tool Wear ◽  
Cutting Tool ◽  
Cutting Tools ◽  
Polycrystalline Diamond ◽  
Water Cooling ◽  
Cooling Speed ◽  
High Silicon ◽  
Polycrystalline Diamond Compact

As high silicon aluminum alloys have both a high strength-to-weight ratio and good wear-resistance, they are used for many automobile and motorbike parts. High silicon aluminum alloys are generally machined to improve dimensional accuracy. In cutting high silicon aluminum alloys such as Al-17mass%Si alloy, the primary Si particles have a negative influence on tool wear. Therefore, polycrystalline diamond compact cutting tools are widely used. In this study, in order to improve the tool wear resistance of polycrystalline diamond compact cutting tools, the Si particle size of Al-17 mass% Si alloy was changed by adjusting the water-cooling speed. Two different kinds of Si particle size, which were changed by adjusting the water-cooling speed, were used. The Al-17mass%Si alloy was turned with the polycrystalline diamond compact cutting tool and the tool wear was experimentally investigated. The main results were as follows: (1) The formed Si particle size was from 30 to 70 μm or from 40 to 170 μm. (2) The mechanical properties of the Al-17 mass% Si alloy did not depend on the Si particle size. (3) The Si particle size included in the Al-17 mass% Si alloy had a major influence of the tool wear, and it was possible to reduce the tool wear by increasing the Si particle size including that in the Al-17 mass% Si alloy.

scholarly journals Oxide inclusions in joints of aluminum alloys made by method of friction welding with mixing

2017 ◽  
Vol 2 (6) ◽  
pp. 3-13
Author(s):  
Виктор Овчинников ◽  
Viktor Ovchinnikov ◽  
Людмила Андреева ◽  
L Andreeva ◽  
Татьяна Любимова ◽  
...  
Keyword(s):  
Aluminum Alloys ◽  
Oxide Layer ◽  
Friction Welding ◽  
Strength Properties ◽  
Surface Oxide ◽  
Surface Oxide Layer ◽  
Test Results ◽  
Welding Arc ◽  
Metal Joint ◽  
The Impact

The paper reports the results of the impact of different edge surfaces preparation upon the structure of a metal joint and strength characteristics of welds made by a method a friction welding with mixing. As objects of investigations there were chosen plates made of aluminum alloys 1565, 1201, 1915, V-1341, 1420 and 1460 with 5 mm thick with different edge machining for welding: by stripping and degreasing; by machining, for surface oxide layer removal; by AC and DC welding arc for “growing” a surface oxide layer and the further analysis of its distribution in a metal joint after welding. In the paper there are shown the results of metal joint micro-structure investigation and also test results of welds for strength. Oxide distribution from the surface of edge surfaces inside joint metal and its influence upon strength properties of joints is analyzed.

scholarly journals SHORT NOTES: APPLICATION OF MINERAL FILLER IN MEDIUM DENSITY FIBERBOARD (MDF) AND ITS EFFECT ON MATERIAL PROPERTIES AS A FUNCTION OF PARTICLE SIZE

Wood Research ◽  
2021 ◽  
Vol 66 (5) ◽  
pp. 891-899
Author(s):  
TOMASZ OZYHAR
Keyword(s):  
Particle Size ◽  
Material Properties ◽  
Filler Content ◽  
Urea Formaldehyde ◽  
Medium Density Fiberboard ◽  
Strength Properties ◽  
Inorganic Filler ◽  
Formaldehyde Resin ◽  
Medium Density ◽  
Wood Fibers

The addition of inorganic filler material in medium density fiberboard (MDF) and the effect on material properties as a function of particle size was examined. Medium density fiberboard was manufactured in a laboratory scale environment to a target raw densityof 750 kgm-3. Wood fibers were replaced by using calcium carbonate at 3 and 10 wt.% using fillers with weighted median particle sizes of d50= 2.0 μm and d50= 30 μm, respectively. Urea formaldehyde resin was used as binder in all MDF. The influence of filler addition on the modulus of elasticity, bending and tensile strength, dimensional stability and liquid permeability was investigated. The results demonstrate the effect of filler content and its dependence on particle size. The addition of filler with d50= 30 μm does not have any influence on material properties up to a filler content of 10 wt.%. Using the finer filler with d50= 2.0 μm at 10 wt.% filler, the quantity significantly increases the water adsorption and swelling behavior and reduces the strength properties of the MDF.

scholarly journals Studying the process of modification of lithium aluminum alloys

2021 ◽  
pp. 55
Author(s):  
Nataliya Kalinina ◽  
Tetyana Nosova ◽  
Stella Mamchur ◽  
Nataliya Tsokur ◽  
Nikita Komarov
Keyword(s):  
Mechanical Properties ◽  
Silicon Carbide ◽  
Particle Size ◽  
Aluminum Alloys ◽  
Magnesium Silicide ◽  
Grain Structure ◽  
Lithium Aluminum ◽  
Cast Aluminum ◽  
Initial State ◽  
Cast Aluminum Alloys

The effect of modification with dispersed compositions on the grain structure and mechanical properties of industrial aluminum alloys has been studied. Aluminum alloys of the Al-Si, Al-Mg-Sc, Al-Cu-Mn systems were modified with dispersed Mg2Si powder with a particle size of up to 200 nm. The amount of modifier to be added to the melt is calculated. The physicochemical properties of dispersed Mg2Si have been studied. Melting of the AMg6, 1570, 2219, AK9ch alloys in the initial state and with the treatment of Mg2Si melts have been carried out. The action of insoluble applications, isomorphic to aluminum, the similarity of the influence of soluble elements holds only when the amount of insoluble addition exceeds the number of crystals formed arbitrarily under the same conditions. Thus, with an increase in the amount of insoluble addition, in particular silicon carbide particles, the grain size first decreases and then remains constant. The mechanism of the influence of dispersed particles of magnesium silicide on the formation of the structure of hypoeutectic aluminum alloys during crystallization is that their bulk is pushed out by the crystallization front into the liquid phase and participates in the refinement of the structural components of the alloy. To determine the optimal amount of silicon carbide modifier, industrial melting and testing were performed on specimens that underwent heat treatment according to the T6 mode (quenching and artificial aging). The quality of cast aluminum alloys during modification depends on many factors: the nature of the dispersed phase, the temperature of the melt, and the modes of its mixing with the introduction of particles. Dependences of the particle size and the amount of the modifier on the mechanical properties of the alloys have been established. The mechanism of interaction of the modifier with aluminum melt during crystallization has been established. In industrial experiments, the most effective size of SiC particles for increasing the σm of the AK9ch alloy from 115 to 260 MPa in the as-cast state has been established. The optimal content of Mg2Si (0.10 %) for increasing the σm of aluminum alloys has been determined.

Various Strength Properties of Aluminum Alloys in High-Pressure Hydrogen Gas Environment

2019 ◽  
Author(s):  
Saburo Matsuoka ◽  
Takashi Iijima ◽  
Satoko Yoshida ◽  
Junichiro Yamabe ◽  
Hisao Matsunaga
Keyword(s):  
Aluminum Alloys ◽  
Room Temperature ◽  
Shear Fracture ◽  
Strength Properties ◽  
Hydrogen Gas ◽  
Relative Reduction ◽  
Strength Tests ◽  
Microstructure Morphology ◽  
Reduction In Area ◽  
Pressure Hydrogen

Abstract Three types of strength tests, slow strain rate tensile (SSRT), fatigue life, and fatigue crack growth (FCG) tests, were performed using six types of aluminum alloys, 5083-O, 6061-T6, 6066-T6, 7N01-T5, 7N01-T6, and 7075-T6, in air and 115 MPa hydrogen gas at room temperature. All the strength properties of every material were not deteriorated in 115 MPa hydrogen gas. In all the materials, FCG rates were lower in 115 MPa hydrogen gas than in air. This was considered to be due to a lack of water- or oxygen-adsorbed film at crack tip in hydrogen gas. In 5083-O, 6061-T6 and 6066-T6, relative reduction in area (RRA) were remarkably higher in 115 MPa hydrogen gas than in air. These differences were attributed to a hydrostatic pressure produced in 115 MPa hydrogen gas. In contrast, in 7N01-T5, 7N01-T6 and 7075-T6, the values of RRA in 115 MPa hydrogen gas were nearly the same as those in air. Observation of fractured specimens inferred that the degree of such a hydrogen-induced improvement was determined by the fracture mode (e.g. cup-and-cone or shear fracture), which is dominated by the microstructure morphology.

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