scholarly journals Iron Intermetallic Phases in the Alloy Based on Al-Si-Mg by Applying Manganese

2017 ◽  
Vol 17 (3) ◽  
pp. 217-221 ◽  
Author(s):  
R. Podprocká ◽  
D. Bolibruchová
Keyword(s):  
Present Article ◽  
Iron Content ◽  
Mechanical Characteristics ◽  
Manganese Content ◽  
Intermetallic Phases ◽  
Chinese Script ◽  
Alloying Element ◽  
Rich Phase ◽  
Iron Intermetallic ◽  
Compact Shape

Abstract Manganese is an effective element used for the modification of needle intermetallic phases in Al-Si alloy. These particles seriously degrade mechanical characteristics of the alloy and promote the formation of porosity. By adding manganese the particles are being excluded in more compact shape of “Chinese script” or skeletal form, which are less initiative to cracks as Al5FeSi phase. In the present article, AlSi7Mg0.3 aluminium foundry alloy with several manganese content were studied. The alloy was controlled pollution for achieve higher iron content (about 0.7 wt. % Fe). The manganese were added in amount of 0.2 wt. %, 0.6 wt. %, 1.0 wt. % and 1.4 wt. %. The influence of the alloying element on the process of crystallization of intermetallic phases were compared to microstructural observations. The results indicate that increasing manganese content (> 0.2 wt. % Mn) lead to increase the temperature of solidification iron rich phase (TAl5FeSi) and reduction this particles. The temperature of nucleation Al-Si eutectic increase with higher manganese content also. At adding 1.4 wt. % Mn grain refinement and skeleton particles were observed.

Review: Effect of Alloying Element on Al-Si Alloys

2013 ◽  
Vol 845 ◽  
pp. 355-359 ◽  
Author(s):  
Mohd Noor Ervina Efzan ◽  
H.J. Kong ◽  
C.K. Kok
Keyword(s):  
Mechanical Characteristics ◽  
High Strength ◽  
Intermetallic Phases ◽  
Alloying Elements ◽  
Alloying Element ◽  
Alloy Casting ◽  
Good Corrosion Resistance ◽  
Strength Enhancement ◽  
Physical And Mechanical Characteristics ◽  
Cast Products

Al-Si alloys are the most common aluminium cast products owing to their high resistance to hot cracking and excellence fluidity during the molten state. They play important roles in aerospace, automobile and structural industries where high strength to weigh ratio, superior heat conductivity and good corrosion resistance applications are necessary. Alloying elements such as copper, magnesium, zinc and nickel are added into the Al-Si alloys for further strength enhancement. However, impurities such as iron are often present in Al-Si alloys, forming brittle intermetallic phases and hence reducing the mechanical strength of the alloys. In this paper, previous studies on the effects of alloying elements on physical and mechanical characteristics of Al-Si alloys will be accounted. Moreover, a comprehensive review on the Al-Si alloy casting methods will also be included.

scholarly journals Possibilities of predicting undesirable iron intermetallic phases in secondary Al-alloys

2021 ◽  
Vol 55 ◽  
pp. 797-804
Author(s):  
Ivana Švecová ◽  
Eva Tillová ◽  
Lenka Kuchariková ◽  
Vidžaja Knap
Keyword(s):  
Intermetallic Phases ◽  
Al Alloys ◽  
Iron Intermetallic

Behavior of intermetallics in liquid Sn–Zn–Ag solder alloys

2003 ◽  
Vol 18 (9) ◽  
pp. 2060-2067 ◽  
Author(s):  
Jenn Ming Song ◽  
Kwang Lung Lin
Keyword(s):  
Intermetallic Phases ◽  
Molten Solder ◽  
Isothermal Heating ◽  
Solder Alloys ◽  
Rich Phase ◽  
Rapid Melting ◽  
Intermetallic Particles ◽  
Subsequent Quenching

This study investigated the characteristics of the intermetallics that appear in Sn–Zn–Ag solder alloys, particularly their behavior in molten solder during cooling and remelting. The results indicated that the intermetallics, which deplete the Zn-rich phase, were present in the form of inhomogeneous dendrites and consisted of two intermetallic phases, ε–AgZn3 and γ–Ag5Zn8. These Ag–Zn intermetallics formed as the primary dendrites upon cooling from temperatures slightly below 300 °C. These intermetallics transformed into coarse nodules with a stable, high Ag-content phase when isothermally heated at 250 °C. These massive intermetallic particles tended to settle at the bottom of the melt due to low buoyancy. Isothermal heating at slightly above 300 °C resulted in the rapid melting of these intermetallics. Subsequent quenching caused numerous fine dendritic intermetallics to form throughout the solder.

scholarly journals Formation of intermetallic phases during solidification in Al-Mg-Mn 5xxx alloys with various Mg levels

2020 ◽  
Vol 326 ◽  
pp. 02002
Author(s):  
Ahmed Y. Algendy ◽  
Kun Liu ◽  
X.-Grant Chen
Keyword(s):  
Intermetallic Phase ◽  
Intermetallic Phases ◽  
Chinese Script ◽  
Electron Backscattered Diffraction ◽  
Scanning Calorimetry ◽  
Scheil Simulation ◽  
Electron Microscopes ◽  
Scanning Electron Microscopes ◽  
Mg Content ◽  
Dominant Phase

In the present study, four Al-Mg-Mn 5xxx alloys with different Mg levels (2-5 wt.%) were investigated for better understanding the evolution of intermetallic phases formed during solidification. Optical and scanning electron microscopes, electron backscattered diffraction and differential scanning calorimetry analyses in combination with thermodynamic calculation were used to identify various intermetallic phases. Results showed that the most dominant intermetallic phases are Al6(Mn,Fe), α-Al(Fe,Mn)Si, Al3Fe, Alm(Mn,Fe) and Mg2Si in experimental Al-Mg-Mn alloys, which is greatly dependant on the Mg levels. It is found that Chinese script α-Al(Fe,Mn)Si is the dominant iron-rich intermetallic phase for the alloys containing 2-3 wt.% Mg, while blocky Al6(Mn,Fe) and needle-like Al3(Mn,Fe) become the major phases for the alloy containing 4 wt.% Mg. Further increasing Mg content to 5 wt. %, the dominant phase transfers to blocky Al6(Mn,Fe) intermetallic. Meanwhile, the morphology of primary Mg2Si is changed from well-branched to plate-like with increasing Mg contents. In addition, β-Al3Mg2 and τ-Al6CuMg4 eutectic phases have been observed in the alloys with 3-5 wt. % Mg. A comparison on various intermetallic phases from the Scheil simulation and the actual as-cast microstructure is provided.

The Iron Content of the Human Brain.—II

1938 ◽  
Vol 84 (353) ◽  
pp. 980-984 ◽  
Author(s):  
A. H. Tingey
Keyword(s):  
Human Brain ◽  
Special Reference ◽  
Iron Content ◽  
Manganese Content ◽  
Iron Copper

In a previous paper (1) the iron, copper and manganese content of the human brain were recorded, with special reference to the G.P.I. cortex, which in certain cases contained an excess of both total and “available” (i.e., non-hæmatin) iron.

Effect of Er on Microstructure and Hardness of Al-Zn-In Alloy

2015 ◽  
Vol 1095 ◽  
pp. 103-106
Author(s):  
Hang Li ◽  
Zheng Bing Xu ◽  
Jian Min Zeng ◽  
Heng Li ◽  
Rong Chen ◽  
...  
Keyword(s):  
Mechanical Property ◽  
Alloying Element ◽  
Rich Phase ◽  
Solidification Interface ◽  
Refined Microstructure

A new sacrificial Al-5Zn-0.03In-Er alloy was developed with improved microstructure consisting of Er rich phase and refined α-Al. This paper focused on the influence of Er as alloying element on the microstructure and hardness of Al-5Zn-0.03In alloy. With the increase of Er content, the α-Al was refined and the hardness was improved, at the same time a amount of Er rich phases and particles also appeared. The segregation of Er in the front of the solidification interface results in the refining of α-Al. The higher hardness of the Er containing alloy make it possilbe to apply the alloy under a complicated enviorment where the mechanical property is requred. It is concluded that 4 wt% Er is optimum to obtain the refined microstructure and proper hardness.

Microstructural and Mechanical Characterization of Nitinol GTAW and FB Welds of Titanium

2006 ◽  
Vol 509 ◽  
pp. 165-170 ◽  
Author(s):  
Alla Kabatskaia Ivanovna ◽  
Victor M. López-Hirata ◽  
Eduardo Oliva López ◽  
Ricardo Rodríguez Figueroa ◽  
Jorge Rodríguez Miramontes
Keyword(s):  
Mechanical Properties ◽  
Chemical Composition ◽  
Mechanical Characterization ◽  
Dendritic Structure ◽  
Intermetallic Phases ◽  
Atomic Diffusion ◽  
Rich Phase ◽  
Gas Tungsten Arc ◽  
Gtaw Process

Microstructural and mechanical characterization of Nitinol gas tungsten arc weld (GTAW) and furnace brazing (FB) welds for grade 1 titanium plates are carried out in order to study the microstructure developed after welding and its effect on the mechanical properties of welds. The GTAW process yields the highest hardness weld. The constituents for this weld consist of a dendritic structure of NiTi and NiTi2 intermetallic phases. The FB process promotes a change of the welds chemical composition due to atomic diffusion of Ti. The weld microconstituents consist of a mixture of a Ti-rich and NiTi2 eutectic and a proeutectic Ti-rich phase.

scholarly journals Influence of cooling rate on microstructure development of AlSi9MgMn alloy

2020 ◽  
pp. 36-36
Author(s):  
Davor Stanic ◽  
Zdenka Zovko-Brodarac
Keyword(s):  
Mechanical Properties ◽  
Cooling Rate ◽  
Eutectic Reaction ◽  
Primary Dendrite ◽  
Manganese Content ◽  
Thermal Analyses ◽  
Chinese Script ◽  
Dendrite Network ◽  
3Si2 Phase

Aluminum alloys are widely applied in automotive, aircraft, food and building industries. Multicomponent technical AlSi9MgMn alloy is primarily intended for high cooling rate technology. Controlled addition of alloying elements such as iron and manganese as well as magnesium can improve mechanical and technological properties of final casting in dependence from cooling conditions during solidification. The aim of this investigation is characterization of AlSi9MgMn alloy microstructure and mechanical properties at lower cooling rates than those for which this alloy was primarily developed. Thermodynamic calculation and thermal analyses revealed solidification sequence in correlation to microstructure investigation as follows: development of primary dendrite network, precipitation of high temperature Al15(Mn,Fe)3Si2 and Al5FeSi phases, main eutectic reaction, precipitation of intermetallic Al8Mg3FeSi6 phase and Mg2Si as a final solidifying phase. Influence of microstructure features investigation and cooling rate reveals significant Al15(Mn,Fe)3Si2 morphology change from Chinese script morphology at low, irregular broken Chinese script morphology at medium and globular morphology at high cooling rate. High manganese content in AlSi9MgMn alloy together with high cooling rate enables increase of Fe+Mn total amount in intermetallic Al15(Mn,Fe)3Si2 phase and encourage favourable morphology development, all resulting in enhanced mechanical properties in as-cast state.

scholarly journals Mapping of Soil Micronutrients (Fe, Mn, Cu, Zn) in the Transition Zone of Northwestern Foothill of Shivaliks of Kathua District Using GIS

2020 ◽  
pp. 115-121
Author(s):  
Vishaw Vikas ◽  
K. R. Sharma ◽  
Vikas Sharma ◽  
Vivak M. Arya ◽  
Rajeev Bharat
Keyword(s):  
Transition Zone ◽  
Iron Content ◽  
Copper Content ◽  
Manganese Content ◽  
Zinc Content ◽  
Mean Value ◽  
Surface Soils ◽  
Study Region ◽  
Composite Surface ◽  
Available Zinc

Aim: To analyze and map the soil micronutrient status in the transition zone of NW foothills of Shivaliks of Kathua Region using GIS. Methodology: Composite surface soil samples from two hundred and six (206) locations distributed randomly due to undulated topography across the whole of the district were collected at the depth of 0-15 cms using global positioning system (GPS). Inverse distance weighting (IDW) technique was adopted to generate prediction maps of the soil properties. The process of digitization and generation of maps was carried out with ArcGIS 10.3. Results: After soil sample analysis, the available copper content in the soil of hilly areas varies from 0.4 to 14.4 mg kg-1 with a mean value of 3.75 mg kg-1. Available Zinc content ranged from 0.25 to 5.60 mg/kg respectively. The available Manganese content of the surface soils varied between 5.60 to 78.10 mg kg-1 with a mean value of 23.97 mg kg-1. Available Iron content ranged from 11.30 to 92.00 mg/kg with a mean value of 38.57 mg kg-1. The available copper content in the soil of plain areas varies from 2.08 to 34.90 mg kg-1 with a mean value of 8.94 mg kg-1. The minimum and maximum values of available copper content lies in higher range. Available Zinc content ranged from 0.25 to 5.60 mg kg-1 respectively. According to the map, available zinc is visualized lowest in plains due to raised soil pH. The available manganese content of the surface soils varied between 2.500 to 57.40 mg/kg with a mean value of 27.03 mg kg-1. Available Iron content ranged from 0 to 66.10 mg kg-1 with a mean value of 41.68 mg kg-1. Conclusion: The mapping was done successfully with micronutrients varying from low to high range. The technique was found to be effective in identifying the micronutrients availability throughout the study region, thereby helping policy makers to frame fertilizer distribution and application policy for future.

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