scholarly journals Influence of Copper Addition in AlSi7MgCu Alloy on Microstructure Development and Tensile Strength Improvement

Metals ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1623
Author(s):  
Davor Stanić ◽  
Zdenka Zovko Brodarac ◽  
Letian Li
Keyword(s):  
Mechanical Properties ◽  
Chemical Composition ◽  
Complex Geometry ◽  
Equilibrium Phase ◽  
Intermetallic Phase ◽  
Chinese Script ◽  
Chemical Compositions ◽  
Copper Addition ◽  
Solidification Sequence ◽  
Wide Range

Commercial AlSi7Mg alloy represents the usual choice for complex geometry casting production. The market imperative to improve mechanical properties imposed the design of new chemical composition of AlSi7MgCu alloy with high content of Cu (up to 1.435 wt.%). This represents a challenge in order to achieve advanced properties. The interaction of a number of alloying (Si, Mg, Cu) and trace elements (Fe, Mn) influenced a wide range of complex reactions occurring and therefore leading to intermetallic phase precipitation. The characterization of novel chemical composition interaction and its solidification sequence was achieved by modelling an equilibrium phase diagram, simultaneously performing both thermal analysis and metallographic investigations. Copper influence was indicated in the whole solidification process starting with infiltration in modified Chinese script phase Al15(Fe,Mn,Cu)3Si2, beside common intermetallic Al5FeSi. Copper addition encourages formation of compact complex intermetallic phases Al5Cu2Mg8Si6 and Al8(Fe,Mn,Cu)Mg3Si6. Solidification ended with secondary eutectic αAl + Al2Cu + βSi. Microstructure investigation allows volume reconstruction of the microstructure and distribution of particular phases. Chemical compositions enriched in copper content and developed microstructural constituent through solidification sequence of AlSi7MgCu alloy contribute to a significant increase in mechanical properties already in an as-cast state.

6XXX Alloys: Chemical Composition and Heat Treatment

2019 ◽  
Author(s):  
Grażyna Mrówka-Nowotnik
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Chemical Composition ◽  
Intermetallic Phase ◽  
Chinese Script ◽  
High Dispersion ◽  
Cu Content ◽  
The Matrix ◽  
Si Content ◽  
Additional Phase

Analysis of the influence of chemical composition, crystallization process and heat treatment on the phase constituents’ morphology, and mechanical properties and crack resistance of 6xxx Al alloys were conducted. The alloys with low Mg and Si content (6063) in the as-cast state are characterized by presence of Si particles and primary intermetallic phases: α-Al8Fe2Si, β-Al5FeSi, β-Mg2Si, and α-Al(FeMn)Si. Higher Mg, Si, and Mn content (6005 and 6082) leads to separation of additional phase particles: Al6Fe, Al6Mn, and Al12(FeMn)Mg3Si6, whereas high Cu content (6061—0.35% and 6066—0.95%, respectively) is responsible for precipitation of additional phase particles: Q-Al5Cu2Mg8Si6 and θ-Al2Cu. It has been established that homogenization results in total dissolution of the θ-Al2Cu and Q-Al5Cu2Mg8Si6 primary phases and partial dissolution of β-Mg2Si. Needle-like and Chinese-script α-Al8Fe2Si and β-Al5FeSi were transformed into spheroidal α-Al(FeMn)Si particles. The maximal consolidation of the 6xxx alloys is a result of precipitation of metastable particles, the transient βʺ, βʹ, and Qʹ/θʹ phases (6061 alloy) with high dispersion. The highest mechanical properties were achieved after holding in the temperature of 565°C/6 h, supersaturated in water, and aging at 175°C/10–20 h (T6). The decohesion process in the presence of tensile stresses in the room temperature proceeds through nucleation, the growth and joining of the voids, as well as the cracking of the primary and secondary large-sized intermetallic phase particles. The increase of deformation temperature up to 300°C causes the changes of the nucleation source and joining of voids—it occurs mainly along the matrix–particle interface.

Influence of Aging Temperatures and Times on Mechanical Properties of Vacuum High Pressure Die Cast Aluminum Alloy A356

2012 ◽  
Vol 445 ◽  
pp. 277-282 ◽  
Author(s):  
Xue Zhi Zhang ◽  
Kazi Ahmmed ◽  
Meng Wang ◽  
Henry Hu
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Thermal Treatment ◽  
Tensile Properties ◽  
Intermetallic Phase ◽  
Aged Alloy ◽  
Cast Aluminum Alloy ◽  
Cast Aluminum ◽  
Die Cast ◽  
Wide Range

In this study a number of thermal treatment schemes over a wide range of temperatures between 120˚ to 350˚ C and times (30 120 minutes) have been experimented in an effort to understand the effect of thermal treatment on tensile properties of vacuum die cast modified aluminum alloy A356. The results show that, the morphology of eutectic silicon has a sound effect on the tensile properties of the tested alloy. The content of magnesium-based intermetallic phases, their morphology and distribution throughout the matrix affect the mechanical properties of the aged alloy as well. The reduction in the strengths of the alloy treated at 350°C for two hours should be at least attributed partly to the absence of the magnesium-based intermetallic phase. However the presence of sufficient amount of magnesium intermetallic phase had played important role in strengthening the alloy thermally treated at 200°C for 90 minutes.

scholarly journals THE UPTAKE ABILITY OF THE CLINOPTILOLITIC TUFFS OF SAMOS ISLAND, GREECE

2004 ◽  
Vol 36 (1) ◽  
pp. 89 ◽  
Author(s):  
N. Kantiranis ◽  
M. Stamatakis ◽  
A. Filippidis ◽  
C. Squires
Keyword(s):  
Chemical Composition ◽  
Atomic Absorption ◽  
Absorption Spectroscopy ◽  
Atomic Absorption Spectroscopy ◽  
Environmental Applications ◽  
Chemical Compositions ◽  
Quantitative Mineralogy ◽  
Wide Range ◽  
Saturation Method ◽  
Good Agreement

The bulk mineralogy and uptake ability of four samples (SA1 to SA4) of clinoptilolite-bearing tuffs from Samos Island, Greece were investigated. The semi-quantitative mineralogical analyses of the samples were determined by powder-XRD (PXRD). The chemical composition of the samples analysed by Atomic Absorption Spectroscopy (AAS), reflected the bulk mineralogy of the samples. The semi-quantitative mineralogy of the samples was found to be in good agreement with their chemical compositions. The uptake ability was measured using the ammonium saturation method (AMAS). The samples consist of clinoptilolite (47-74 wt. %), micas (muscovite and/or illite) (4-13 wt. %) and smectite (2-13 wt. %) and have uptake abilities between 133 and 184 meq/100g. Such materials, especially the clinoptilolite-rich ones, could be used in a wide range and scale of agricultural, aquacultural, industrial and environmental applications.

Optimization of Chemical Composition for Pressure Vessel Steel Grade P460NL2 - Industrial Trial Research

2017 ◽  
Vol 1143 ◽  
pp. 45-51 ◽  
Author(s):  
Costel Durduc-Roibu ◽  
Elena Drugescu
Keyword(s):  
Mechanical Properties ◽  
Chemical Composition ◽  
Steel Grade ◽  
Chemical Compositions ◽  
Pressure Vessel Steel ◽  
Vessel Steel ◽  
Industrial Trial ◽  
Tension Tests ◽  
Rolling Mode ◽  
Strength And Toughness

The research examines the improvements of mechanical properties of yield strength and toughness for an optimized chemical composition B2 used in industrial trial in comparison with usual chemical composition A1 used for pressure steel grade with higher strength and toughness. For both chemical compositions we rolled three plates with thickness 8, 10 and 12 mm. Rolling mode was a control rolling followed by normalizing heat treatment. Samples from each plate from opposites corner in as rolled and normalized state was taken and tested: spectral analysis, mechanical properties: tension tests, Charpy-V notch impact test. Differences between A1 and B2 chemical compositions are given by the micro alloing elements used and the overall results showed increasing YS and toughness values in the range of euronorm requirements.

scholarly journals Electron microscopy and x-ray spectral microanalysis of types and chemical propeties inclusions of the railway axis from a continuous billet

2018 ◽  
pp. 25-34
Author(s):  
M.I. Gasik ◽  
M.M. Gasik ◽  
Yu.V, Klimchik ◽  
Yu.V. Projdak ◽  
A,P, Gorobets ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Chemical Composition ◽  
Physical And Mechanical Properties ◽  
Original Data ◽  
Chemical Compositions ◽  
Sulphide Mineral ◽  
X Ray ◽  
Railway Axle ◽  
Metallic Inclusions

Purpose. Analysis of status and chemical composition of non-metallic inclusions of raw railway truck axle shafts steel using electron microscopy and X-ray spectral microanalysis for the improvement of the throughout technology of the axles production. Methodology. Study of phase composition and type of non-metallic inclusions in axles shaft steel was carried out with modern equipment and method of X-ray spectral microanalysis for quantitative and qualitative data. Findings. The analysis of the elements on chemical composition on EA1N steel and of non-metallic inclusions on physical and mechanical properties of railway axles made by rolling of continuous cast billt of 470 mm diameter. The types and composition of non-metallic inclusions were studied with electron microscopy and X-ray spectral microanalysis. Results can be applied for improvement of steel refining and alloying technology for railway wheel axles production. Originality. There were discovered the original data about the types and chemical compositions of nonmetallic heterophasic inclusions in railway axis metal using the electronic microscopy and X-ray microanalysis. The obtained research results about formations of multiphase inclusions were proved using the phase equilibrium charts consiolering oxide, oxide-sulphide mineral phases. Practical value. The results of electron microscopy and X-ray spectral microanalysis are important to understand and improve the throughput technology of refining and alloying of EA1N steel for railway axle shafts. Keywords: railway axle, railway truck, axle shaft, steel chemical composition, continuous casting billet, mechanical properties, non-metallic inclusions

scholarly journals 3D Printing of Thermoplastic Elastomers: Role of the Chemical Composition and Printing Parameters in the Production of Parts with Controlled Energy Absorption and Damping Capacity

Polymers ◽  
2021 ◽  
Vol 13 (20) ◽  
pp. 3551
Author(s):  
Marina León-Calero ◽  
Sara Catherine Reyburn Valés ◽  
Ángel Marcos-Fernández ◽  
Juan Rodríguez-Hernandez
Keyword(s):  
Mechanical Properties ◽  
Chemical Composition ◽  
3D Printing ◽  
Energy Absorption ◽  
Thermoplastic Elastomers ◽  
Damping Capacity ◽  
Compression Tests ◽  
Wide Range ◽  
Printing Parameters

Additive manufacturing (AM) is a disruptive technology that enables one to manufacture complex structures reducing both time and manufacturing cost. Among the materials commonly used for AM, thermoplastic elastomers (TPE) are of high interest due to their energy absorption capacity, energy efficiency, cushion factor or damping capacity. Previous investigations have exclusively focused on the optimization of the printing parameters of commercial TPE filaments and the structures to analyse the mechanical properties of the 3D printed parts. In the present paper, the chemical, thermal and mechanical properties for a wide range of commercial thermoplastic polyurethanes (TPU) filaments were investigated. For this purpose, TGA, DSC, 1H-NMR and filament tensile strength experiments were carried out in order to determine the materials characteristics. In addition, compression tests have been carried out to tailor the mechanical properties depending on the 3D printing parameters such as: infill density (10, 20, 50, 80 and 100%) and infill pattern (gyroid, honeycomb and grid). The compression tests were also employed to calculate the specific energy absorption (SEA) and specific damping capacity (SDC) of the materials in order to establish the role of the chemical composition and the geometrical characteristics (infill density and type of infill pattern) on the final properties of the printed part. As a result, optimal SEA and SDC performances were obtained for a honeycomb pattern at a 50% of infill density.

Characterization of Mg-Zn Layered Bulk Materials Prepared by Powder Metallurgy Method

2020 ◽  
Vol 405 ◽  
pp. 385-390
Author(s):  
Pavel Doležal ◽  
Michaela Krystýnová ◽  
Tomas Marada ◽  
Helena Doležalová Weissmannová
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Chemical Composition ◽  
Intermetallic Phase ◽  
Thick Layer ◽  
Powder Metallurgy Method ◽  
Strengthening Effect ◽  
Pressing Method ◽  
Zinc Alloys ◽  
Fine Grained

In this study three-layered materials composed of one zinc layer between two magnesium layers were prepared. Diffusion at the Mg-Zn boundary leads to the formation of thermodynamically more stable, yet mechanically very brittle intermetallic phase. Homogenous distribution of the fine-grained MgZn2 intermetallic phase in magnesium or zinc alloys has a positive effect on strength of these alloys. In a form of continuous thick layer stretching throughout the whole material, the phase may leads to deterioration of mechanical properties. However, the mechanism of fracture has not yet been sufficiently described. The Mg based materials with one layer of Zn were investigated in terms of chemical composition and mechanical properties and fractographic evaluation. The materials with 0.25 mm, 0.5 mm, 1 mm and 2 mm thick layer of Zn were processed via bidirectional hot pressing method at 300 °C and 500 MPa. The phase and chemical composition of prepared materials was characterized by XRD and SEM-EDS methods. The mechanical properties were evaluated based on the results of three-point bend test and fractographic analysis of fracture surface. The results showed formation of MgZn2 intermetallic phase on the interface of Mg and Zn layers and solid solution of Zn in Mg. The results showed that the presence of Zn layer leads to improvement of mechanical properties when compared to pure Mg prepared at the same condition. The strengthening effect of solid solution and intermetallic phase may be the reason of the increase of flexural strength.

scholarly journals Influence of Metallic Oxide Nanoparticles on the Mechanical Properties of an A-TIG Welded 304L Austenitic Stainless Steel

Materials ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 4513
Author(s):  
Sebastian Balos ◽  
Miroslav Dramicanin ◽  
Petar Janjatovic ◽  
Nenad Kulundzic ◽  
Ivan Zabunov ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Base Metal ◽  
Austenitic Stainless Steels ◽  
Sio2 Nanoparticles ◽  
Oxide Nanoparticles ◽  
Chemical Compositions ◽  
Metallic Oxide ◽  
Activating Flux ◽  
Wide Range ◽  
Metallic Oxide Nanoparticles

Austenitic stainless steels represent a significant aerospace material, being used for various castings, structural components, landing gear components, afterburners, exhaust components, engine parts, and fuel tanks. The most common joining process is tungsten inert gas (TIG) welding, which possesses many advantages such as suitability to weld a wide range of ferrous and non-ferrous metals and alloys, providing high quality welds with good mechanical properties. Its major disadvantage is low productivity due to low penetration and welding speed. This can be overcome by introducing an activating flux before welding. The activating flux reverses the material flow of the weld pool, significantly increasing penetration. Therefore, shielding gas consumption is reduced and welding without a consumable is enabled. However, the consumable in conventional TIG also enables the conditioning of the mechanical properties of welds. In this study, Si and Ti metallic oxide nanoparticles were used to increase the weld penetration depth, while bend testing, tensile, and impact toughness were determined to evaluate the mechanical properties of welds. Furthermore, optical emission spectroscopy, light, and scanning electron microscope were used to determine the chemical compositions and microstructures of the welds. Chemical compositions and weld mechanical properties were similar in all specimens. The highest tensile and impact properties were obtained with the specimen welded with the flux containing 20% TiO2 and 80% SiO2 nanoparticles. Although lower than those of the base metal, they were well within the nominal base metal mechanical properties.

Effect of Alloying Elements on Microstructure, Texture Development, and Mechanical Properties of Magnesium Alloys

2012 ◽  
Vol 217-219 ◽  
pp. 382-385 ◽  
Author(s):  
Chang Wan Ha ◽  
Sung Ji Choi ◽  
No Jin Park
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Chemical Composition ◽  
Magnesium Alloy ◽  
Shear Band ◽  
Tensile Test ◽  
Magnesium Alloys ◽  
Chemical Compositions ◽  
Basal Texture ◽  
Hot Rolled

In this study, the magnesium alloys AZ31, ZK10, and ZEK100 are investigated through microstructure, texture, and tensile test. The sheets were hot rolled, and different results were found for different chemical compositions. The contained elements affected the grain size, shear band, twins, and intensity of the basal texture of the magnesium alloy. Thus, if a magnesium sheet had finer grains and a weak (00.1) texture because of its chemical composition, it had the most favorable formability.

scholarly journals Influence of copper content on microstructure development of AlSi9Cu3 alloy

2014 ◽  
Vol 50 (1) ◽  
pp. 53-60 ◽  
Author(s):  
Zovko Brodarac ◽  
N. Dolic ◽  
F. Unkic
Keyword(s):  
Copper Content ◽  
Ternary Eutectic ◽  
Equilibrium Phase ◽  
Intermetallic Phase ◽  
Equilibrium Phase Diagram ◽  
Metallographic Analysis ◽  
Microstructure Development ◽  
Microstructural Investigation ◽  
Solidification Sequence

Microstructure development and possible interaction of present elements have been determined in charge material of EN AlSi9Cu3 quality. Literature review enables prediction of solidification sequence. Modelling of equilibrium phase diagram for examined chemical composition has been performed, which enables determination of equilibrium solidification sequence. Microstructural investigation indicated distribution and morphology of particular phase. Metallographic analysis tools enable exact determination of microstructural constituents: matrix ?Al, eutectic ?Al+?Si, iron base intermetallic phase - Al5FeSi, Alx(Fe,Mn)yCuuSiw and/or Alx(Fe,Mn)yMgzCuuSiw and copper base phases in ternary eutectic morphology Al-Al2Cu-Si and in complex intermetallic ramified morphology Alx(Fe,Mn)yMgzSiuCuw. Microstructure development examination reveals potential differences due to copper content which is prerequisite for high values of final mechanical, physical and technological properties of cast products.

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