The Influence of Alloy Composition Upon the Corrosion Behaviour of 25cr-35ni-Fe Alloys Exposed to Mixed Gaseous Oxidising/Sulphidising/Carburising Atmospheres

1987 ◽  
pp. 173-194
Author(s):  
J. F. Norton ◽  
J. A. Kneeshaw
Keyword(s):  
Alloy Composition ◽  
Corrosion Behaviour ◽  
Fe Alloys

Characterisation of AlFeSi Intermetallics in 6000 Series Aluminium Alloy Extrusions

2006 ◽  
Vol 519-521 ◽  
pp. 303-308 ◽  
Author(s):  
Malcolm J. Couper ◽  
Barbara Rinderer ◽  
Ji Yong Yao
Keyword(s):  
Aluminium Alloy ◽  
Alloy Composition ◽  
Intermetallic Phases ◽  
Alloy Design ◽  
Alloy Content ◽  
Fe Alloys

Alloys designed to optimise strength and extrudability have a lower alloy Mg to Si ratio than has commonly been used in AA6060 and AA6063 alloys. Intermetallic phases have an impact on alloy design since they tie up some of the Mg and Si alloy content. The effect of Mg and Si alloy content on the type of intermetallic phases present has been investigated using TEM, SEM and Thermocalc analysis. Results for Al-Mg-Si-Fe alloys with 0.46 - 0.70 wt%Mg, 0.27 - 1.24 wt%Si and 0.09 - 0.22 wt%Fe are presented. The occurrence of a-AlFeSi (various stoichiometries), b- Al5FeSi, p-Al8FeSi6Mg3, Mg2Si and Si has been found to depend on alloy composition within the ranges examined.

The Microstructure of Quasicrystalline Al-Cu-Fe Alloys Doped with Tungsten

2013 ◽  
Vol 203-204 ◽  
pp. 372-375 ◽  
Author(s):  
Wojciech Gurdziel ◽  
Jacek Krawczyk ◽  
Włodzimierz Bogdanowicz
Keyword(s):  
Electron Microscope ◽  
Induction Furnace ◽  
Alloy Composition ◽  
Solidification Process ◽  
Icosahedral Phase ◽  
Chemical Compositions ◽  
X Ray ◽  
Fe Alloys ◽  
Two Stages ◽  
Scanning Electron

The microstructure of Al65Cu20Fe14 (numbers indicate at.%) alloy doped with 1 at.% of W was studied. The selected alloy composition should allow to obtain the quasicrystalline icosahedral phase after solidification process. The bulk samples were obtained in two stages. At first, the synthesis of alloy through premelting of component elements in induction furnace and then, the directional solidification by the Bridgman method were performed. The morphology of selected areas of the samples were studied using Scanning Electron Microscope equipped with energy dispersive X-ray spectroscope, which was used to examine chemical compositions of each analysed areas. Additionally the X-ray powder diffraction was used to identify the phases present in the alloys. It was stated that the filaments of tungsten were present in the alloys. The filaments have thickness ranged from 0.01 to 2.5 μm. As a result of investigation, the arrangement of filaments in the material was determined.

scholarly journals The Influence of Alloy Composition and microstructure on the corrosion behaviour of Cu-Ni alloys in seawater

1983 ◽  
Vol 34 (4) ◽  
pp. 167-178 ◽  
Author(s):  
L. J. P. Drolenga ◽  
F. P. Ijsseling ◽  
B. H. Kolster
Keyword(s):  
Alloy Composition ◽  
Corrosion Behaviour ◽  
Ni Alloys

Alloy Composition and Dendrite Arm Spacing in Al-Si-Cu-Mg-Fe Alloys

2013 ◽  
Vol 44 (9) ◽  
pp. 4071-4080 ◽  
Author(s):  
Tharmalingam Sivarupan ◽  
Carlos H. Caceres ◽  
John A. Taylor
Keyword(s):  
Alloy Composition ◽  
Dendrite Arm Spacing ◽  
Fe Alloys

scholarly journals Structure Formation and Corrosion Behaviour of Quasicrystalline Al–Ni–Fe Alloys

2017 ◽  
Vol 18 (2) ◽  
pp. 222-227 ◽  
Author(s):  
О.V. Sukhova ◽  
V.A. Polonskyy ◽  
К.V. Ustinovа
Keyword(s):  
Room Temperature ◽  
Volume Fraction ◽  
Corrosion Behaviour ◽  
Corrosion Performance ◽  
X Ray Diffraction ◽  
X Ray ◽  
Acidic Solutions ◽  
Decagonal Phase ◽  
Fe Alloys ◽  
Saline Solutions

The formation of quasicrystalline decagonal phase and related crystalline phases was investigated by a combination of optical metallography, powder X-ray diffraction, atomic absorption spectroscopy and differential thermal analysis. Corrosion behaviour of quasicrystal Al–Ni–Fe alloys was studied by gravimetric and potentiodynamic polarization experiments in saline and acidic solutions at room temperature. The decagonal phase exhibits two modifications (AlFe- and AlNi-based) depending on the composition. In Al72Ni13Fe15 alloy it coexists with monoclinic Al5FeNi phase. In Al71.6Ni23Fe5.4 alloy crystalline Al13(Ni,Fe)4, Al3(Ni,Fe)2, and Al3(Ni,Fe) phases are seen adjacent to the quasicrystalline decagonal phase. Stability of quasicrystal phase up to room temperature was shown to be connected with its incomplete decomposition during cooling at a rate of 50 K/min. Al72Ni13Fe15 alloy has more than twice larger volume fraction of this phase compared to that of Al71.6Ni23Fe5.4 alloy. A dependence of microhardness on composition was observed as well, with Al72Ni13Fe15 alloy having substantially higher values. In acidic solutions, Al71.6Ni23Fe5.4 alloy showed the best corrosion performance. In saline solutions, the investigated alloys remained mainly untouched by corrosion. Mass-change kinetics exhibited parabolic growth rate. 

scholarly journals Corrosion behaviour of quasicrystal Al – Cu – Fe and Al – Ni – Fe alloys in acidic solutions

2018 ◽  
Vol 88 (4) ◽  
pp. 19-26
Author(s):  
O. V. Sukhova ◽  
◽  
V. A. Polonskyy ◽  
K. V. Ustinova ◽  
M. V. Berun ◽  
...  
Keyword(s):  
Corrosion Behaviour ◽  
Acidic Solutions ◽  
Fe Alloys
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