Influence of Sr Addition on the Microstructure and Properties of HPDC EN AC-Al Si9Cu3(Fe) Alloy

2016 ◽  
Vol 682 ◽  
pp. 69-76 ◽  
Author(s):  
Łukasz Poloczek ◽  
Bartłomiej Dybowski ◽  
Andrzej Kiełbus ◽  
Michał Łuszczak
Keyword(s):  
Mechanical Properties ◽  
Tensile Testing ◽  
Volume Fraction ◽  
Eutectic Mixture ◽  
Intermetallic Phases ◽  
Sr Modification ◽  
Die Cast ◽  
Binary Eutectic ◽  
Alloy Microstructure ◽  
Scanning Electron

The following paper presents results of the researches on the influence of Sr addition on microstructure and mechanical properties of EN AC-Al Si9Cu3(Fe) HPDC alloy. Two different elements were high pressure die cast for the research, one with Sr addition, second one without. Investigations involved light and scanning electron microscopy as well as hardness and tensile testing. EN AC-Al Si9Cu3(Fe) HPDC alloy microstructure is characterized by a fine dendrites of α-Al solid solution and AlSi binary eutectic mixture. What is more, many intermetallic phases are observed in the alloy. These are: α-Al15(Fe,Mn,Cr)3Si2, β-A5FeSi, A2Cu, π-A8Mg3FeSi6 and Q-Al5Mg8Cu2Si6. Sr modified alloy is characterized by a significant volume fraction of fine, fibrous AlSi-eutectic. The porosity in the modified alloy slightly decreased. Mechanical properties of the alloy increased after Sr modification.

Effect of B Refinement on Structure and Fracture Morphology of Al-7 wt.% Si Alloy

2014 ◽  
Vol 590 ◽  
pp. 181-186
Author(s):  
Xiao Song Li ◽  
An Hui Cai ◽  
Ji Jie Zeng
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Scanning Electron Microscopy ◽  
Tensile Testing ◽  
Testing Machine ◽  
Fracture Morphology ◽  
Optical Microscope ◽  
Tensile Testing Machine ◽  
Alloy Microstructure ◽  
Scanning Electron

Using optical microscope, electronic tensile testing machine, scanning electron microscopy methods, such as detailed treatment of the B hypoeutectic Al-Si alloy microstructure, mechanical properties and fracture morphology were studied. The results showed that after treatment by the B refinement, α-Al dendrite phase was refined, resulting in mechanical properties of Al-Si alloy significantly improved. Which, B content 0.036wt.%, the alloy the best, the σb, δ, respectively, than the non-thinning increased 67.8% and 15.2%. From the fracture surface, the fracture morphology of the specimen showed a quasi-cleavage fracture. Which, B content 0.036wt.% at the time of fracture is more deep dimples, and a good plastic toughness.

Investigation of the Role of Intermetallic Phases in Microstructure of UFG Titanium VT8M-1 Alloy

2021 ◽  
Vol 1016 ◽  
pp. 1659-1663
Author(s):  
Tatyana Vitalyevna Yakovleva ◽  
Grigory Dyakonov ◽  
Andrey Stotskiy ◽  
Iuliia Mikhailovna Modina ◽  
Irina Semenova
Keyword(s):  
Intermetallic Phases ◽  
High Temperature Strength ◽  
Electronic Microscopy ◽  
Two Phase ◽  
Rotary Swaging ◽  
Operation Temperature ◽  
Ultrafine Grained ◽  
Alloy Microstructure ◽  
Scanning Electron

The paper studies the microstructure of two-phase ultrafine-grained titanium VT8M-1 alloy (Ti-5.7Al-3.8Mo-1.2Zr-1.3Sn), which was obtained by rotary swaging (RS). Parameters of the microstructure and the change of the phase elemental / chemical composition were investigated by scanning electron microscopy and transmission electronic microscopy. It was shown that the silicide particles like S2 - (Ti,Zr)6Si3 were precipitated in the process of rotary swaging. The influence of silicide precipitations on the characteristics of high temperature strength of the ultrafine-grained two-phase titanium VT8M-1 alloy was discussed in the paper. The alloy microstructure was analyzed after the creep-rupture tests in the operation temperature range 300-400oС.

Evaluation of 4330M Steel for Fasteners Applications

2017 ◽  
Vol 380 ◽  
pp. 198-211 ◽  
Author(s):  
A. Al Sumait ◽  
C. Delgado ◽  
F. Aldhabib ◽  
X. Sun ◽  
F. Alzubi ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Scanning Electron Microscopy ◽  
Tensile Testing ◽  
Grain Structure ◽  
Hardness Testing ◽  
Heat Treated ◽  
Different Types ◽  
Strength And Ductility ◽  
Scanning Electron

The objective of the study was to optimize the strength and ductility values of the 4330M steel. Optimization was conducted through different types of heat treatments. Tensile testing, hardness testing, optical microscopy, and Scanning Electron Microscopy (SEM) were used to evaluate the mechanical properties and microstructure of the as-received and the heat treated samples. The alloy was provided from two vendors; vendor H and vendor S. Results showed that by increasing the tempering temperatures, strength values decreases, while ductility values remain unchanged. Vendor H samples had higher strength values and much finer grain structure which was revealed only at 5000x magnification.

The Microstructure of AlSi7Mg Alloy in as Cast Condition

2015 ◽  
Vol 229 ◽  
pp. 3-10 ◽  
Author(s):  
Bartłomiej Dybowski ◽  
Bogusława Adamczyk-Cieślak ◽  
Kinga Rodak ◽  
Iwona Bednarczyk ◽  
Andrzej Kiełbus ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Chemical Composition ◽  
Energy Dispersive Spectrometry ◽  
Intermetallic Phases ◽  
Transmission Electron ◽  
Alloy Microstructure ◽  
Cast Condition ◽  
Scanning Electron

The complex microstructure of as-cast AlSi7Mg alloy has been investigated. Microstructure observations were done using light microscopy, scanning electron microscopy and transmission electron microscopy. Chemical composition of the microstructure constituents was investigated by means of energy dispersive spectrometry, conducted both during SEM and STEM investigations. Selected area diffraction was used to identify the phases in the alloy. Microstructure of the alloy in the as-cast condition consists of Al-Si eutectic and intermetallic phases in the interdendritic regions. These are: Mg2Si, α-AlFeMnS, β-AlFeSi and π-AlFeSiMg phases. What is more, number of fine precipitates were found within the α-Al dendrites. Only the occurrence of U1 (MgAl2Si2) phase has been confirmed.

scholarly journals Effect of Er on Microstructure and Mechanical Properties of 5052 Aluminum Alloy with Big Width-To-Thickness Ratio

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 568
Author(s):  
Xinwei She ◽  
Xianquan Jiang ◽  
Bao Qi ◽  
Kang Chen
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Tensile Testing ◽  
Testing Machine ◽  
Thickness Ratio ◽  
Tensile Testing Machine ◽  
Microstructure And Mechanical Properties ◽  
Long Time ◽  
Scanning Electron ◽  
Al Matrix

The effect of Er on microstructure and mechanical properties of the 5052 aluminum alloy with a big width-to-thickness ratio was investigated by a metallurgical microscope, scanning electron microscope and tensile testing machine. The results showed that the precipitates were slightly refined after Er addition and Al3Fe was transformed into Al6Fe and AlEr with/without a small amount of Fe or Si. The effect of Er on grain refinement was related to its content. When Er content was lower or higher than 0.4%, the grain would coarsen. Homogenization could refine the grain by controlling Er content and distribution in the Al matrix. Long time homogenization at high temperature would significantly reduce the strength of the 5052 aluminum alloy and 5052 aluminum alloys with low Er content, but help to improve the plasticity of those with high Er content. The ultimate tensile strength, yield strength and elongation of the as-cast 5052 aluminum alloy were 197 MPa, 117 MPa and 22.5% respectively. The strength was the highest, when Er content was 0.4 wt. % and the elongation was the best at 0.1 wt. % Er content.

The Influence of the Al-Ti-B/Al-Sr Modification on the Microstructure and Properties of the Hypereutectic Al-Si Alloy in Automotive Piston

2013 ◽  
Vol 744 ◽  
pp. 339-344 ◽  
Author(s):  
Meng Xiang Liu ◽  
Jian Mei Chen
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Friction And Wear ◽  
Eutectic Silicon ◽  
Primary Silicon ◽  
Optical Microscope ◽  
Sr Modification ◽  
Alloy Microstructure ◽  
Compound Modification ◽  
Better Than

By using some types of means such as Optical Microscope (OM), Scanning Electron Microscopy(SEM), the testing of tensile mechanical properties and the testing of friction and wear, the impacts of the Al-5Ti-1B and Al-20Sr modification on the Al-16Si-4Cu-0.5Mg-0.2Mn alloy microstructure, mechanical properties and friction properties are researched. The results turn out that the modification can significantly refine the primary silicon and the eutectic silicon in the alloy, the Al-5Ti-1B mainly refined the primary silicon in the alloy, the Al-20Sr refined the eutectic silicon; the alloy’s effect of refinement after compound modification is better than that in separate metamorphism. Modification can improve the tensile strength and elongation of the alloy: the tensile strength of the alloy has been increased by 65MPa after its compound modification; also the elongation by 0.4%. Modification can improve wear-resisting property of the alloy and also its effect of compound modification is better than that of separate metamorphism. The modification mechanism of Al-5Ti-1B is that Al3Ti and TiB2 belongs to heterogeneous nucleation; while the modification mechanism of Al-20Sr is that the strontium changes the growth pattern of Si phase.

MECHANICAL PROPERTIES (IMPACT STRENGTH) OF PINEAPPLE LEAF FIBRE REINFORCED POLYPROPYLENE COMPOSITES WITH VARIATION OF FIBRE LOADING AND TREATMENT PROCESS.

2018 ◽  
Vol 2 (4) ◽  
Author(s):  
SM Sapuan 1,2,,b ◽  
S. Izwan 1a
Keyword(s):  
Mechanical Properties ◽  
Impact Strength ◽  
Treatment Process ◽  
Volume Fraction ◽  
Thermoplastic Composite ◽  
Polypropylene Composites ◽  
Sem Micrograph ◽  
Good Potential ◽  
Fibre Loading ◽  
Scanning Electron

This paper presents the study of mechanical properties of short pineapple leaf fibre reinforced polypropylene composites. Pineapple leaf fibre (PALF) is one of them that have also good potential as reinforcement in thermoplastic composite. It is the objective of the current research to characterize the mechanical properties of treated and untreated composites of PALF reinforced polypropylene (PP) composite with four different volume fractions of pineapple leaf fiber (PALF) was fabricated, (5 vol%, 10 vol%, 15 vol% and 20 vol%).  The study of this PALF-PP composite demonstrates that bulk density of the composite decrease as the volume fraction increased. From the study about impact strength toward the fibre loadings, impact strength and energy absorbed increase as the volume fraction of fibre increased. Untreated PALF gives greater impact strength than treated PALF. From the experiment conducted on impact test and scanning electron microscopy experiment, untreated fibre produce greater impact and absorbed energy than treated fibre. Until 20% of PALF, result showed strength of the composite still rising to prove that 20% of fibre will fabricate finest fibre loading for the PALF-PP composite was observed from the scanning electron microscope (SEM) micrograph as an evidences on compatibility mechanical properties at the intersectional region of composite.

scholarly journals Microstructure of Mg–Al–RE-type Experimental Magnesium Alloy Gravity Cast into Sand Mould

2016 ◽  
Vol 16 (2) ◽  
pp. 115-118 ◽  
Author(s):  
K.N. Braszczyńska-Malik ◽  
E. Przełożyńska
Keyword(s):  
Electron Microscopy ◽  
Magnesium Alloy ◽  
Intermetallic Phase ◽  
Intermetallic Phases ◽  
Equilibrium Solidification ◽  
Alloy Microstructure ◽  
Sand Mould ◽  
Cast Condition ◽  
Gravity Cast ◽  
Scanning Electron

Abstract Magnesium alloy with 5 wt% Al, 0.35 wt% Mn and 5 wt% rare earth elements (RE) was prepared and gravity cast into a sand mould. Microstructure investigations were conducted. Analyses of the Mg-Al-RE alloy microstructure were carried out by light microscopy, scanning electron microscopy and the XRD technique. In the as-cast condition, the alloy was composed of α-Mg, Al11RE3 and Al10RE2Mn7 intermetallic phases. Additionally, due to non-equilibrium solidification conditions, an Al2RE intermetallic phase was revealed.

Mechanical Properties of Diamond Fibres

1995 ◽  
Vol 383 ◽  
Author(s):  
N. M. Everitt ◽  
R. A. Shatwell ◽  
E. Kalaugher ◽  
E. Nicholson
Keyword(s):  
Mechanical Properties ◽  
Silicon Carbide ◽  
Grain Size ◽  
Fracture Strength ◽  
Coating Thickness ◽  
Tensile Testing ◽  
Volume Fraction ◽  
Thick Films ◽  
Diamond Coating ◽  
Bending Tests

ABSTRACTTungsten and silicon carbide fibres have been coated with diamond using the HFCVD technique. The diamond volume fraction varied between 26% and 73%. Resonance in bending tests gave a Young's modulus of 880 GPa for the diamond coating. Tensile testing indicated that the diamond fracture strength was between 600 MPa and 2000 MPa, depending on the coating thickness, and thus the grain size, of the diamond. The strain to failure of the diamond coating in bending was approximately 0.15% for 25 μm thick films.

scholarly journals Analysis of Morphological and Mechanical Behaviors of Bamboo Flour Reinforced Polypropylene Composites

2013 ◽  
Vol 13 (1) ◽  
pp. 95-100 ◽  
Author(s):  
Netra L Bhandari ◽  
Sabu Thomas ◽  
Chapal K Das ◽  
Rameshwar Adhikari
Keyword(s):  
Mechanical Properties ◽  
Tensile Testing ◽  
Mechanical Behaviors ◽  
Melt Mixing ◽  
Polypropylene Composites ◽  
Chemically Modified ◽  
Polypropylene Matrix ◽  
Pp Composites ◽  
Bamboo Flour ◽  
Scanning Electron

In this paper, the bamboo flour (BF) reinforced polypropylene (PP) composites were studied with special attention to morphology of the composites and the effectiveness of chemically modified fillers to improve their mechanical properties. The composites of polypropylene with neat bamboo flour (BF) and treated bamboo flour (TBF) in different proportions were prepared by melt mixing followed by compression molding. The samples were characterized by Fourier Transform Infrared (FTIR) spectroscopy, Scanning Electron Microscopy (SEM), tensile testing and water absorption testing. The results show that the alkali treated BF is compatible with polypropylene matrix than the neat one as the effects are reflected in the morphological features of the composites and their tensile mechanical properties. Nepal Journal of Science and Technology Vol. 13, No. 1 (2012) 95-100 DOI: http://dx.doi.org/10.3126/njst.v13i1.7447

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