The effects of microstructure and intermetallic phases of directionally solidified Al–Fe alloys on microhardness

2012 ◽  
Vol 89 ◽  
pp. 291-295 ◽  
Author(s):  
Bismarck L. Silva ◽  
Amauri Garcia ◽  
José E. Spinelli
Keyword(s):  
Intermetallic Phases ◽  
Directionally Solidified ◽  
Fe Alloys

Nucleation of Fe-intermetallic phases in the Al-Si-Fe alloys

2005 ◽  
Vol 36 (4) ◽  
pp. 1017-1032 ◽  
Author(s):  
W. Khalifa ◽  
F. H. Samuel ◽  
GM-NSERC-UQAC ◽  
J. E. Gruzleski ◽  
H. W. Doty ◽  
...  
Keyword(s):  
Intermetallic Phases ◽  
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.

Formation and Transformation of Binary Intermetallic Phases in High Purity Al-Fe Alloys

1991 ◽  
Vol 44-45 ◽  
pp. 17-30 ◽  
Author(s):  
A. Griger ◽  
Vilmos Stefániay ◽  
Erzsébet Kovács-Csetényi ◽  
T. Turmezey
Keyword(s):  
High Purity ◽  
Intermetallic Phases ◽  
Fe Alloys

Three Dimensional Morphology of Mn Rich Intermetallics in AlSi Alloys Investigated with X-Ray Tomography

2014 ◽  
Vol 790-791 ◽  
pp. 335-340 ◽  
Author(s):  
Piotr Mikolajczak ◽  
Lorenz Ratke
Keyword(s):  
Fluid Flow ◽  
Three Dimensional ◽  
Intermetallic Phases ◽  
Primary Phase ◽  
Rotating Magnetic Field ◽  
Solidification Velocity ◽  
Directionally Solidified ◽  
X Ray ◽  
Spatial Morphology ◽  
Fe Intermetallics

Elementary Mn has a great importance as neutralizer of Fe intermetallics like β-Al5FeSi, which have detrimental effect on mechanical characteristics of AlSi alloys. Presence of Mn in AlSi alloys causes the formation of other intermetallic phases. To understand the effect of solidification conditions and fluid flow on the microstructure of AlSi-based alloys and the addition of Mn leading to Mn-based intermetallics, Al-5 wt pct Si 0.2/0.4/1.0 wt pct Mn alloys have been directionally solidified under defined thermal (gradient 3 K/mm, solidification velocity 0.02-0.12 mm/s) and fluid flow (rotating magnetic field 6 mT) conditions. The primary Al-phase and Mn-based intermetallic phases were studied using 3D X-ray tomography. The spatial morphology of primary phase and intermetallics were characterized with respect to different fluid flow and solidification conditions. The tomography has showed the 3D complicated structure of Mn phases developed.

Characterization of Dendritic Microstructure, Intermetallic Phases, and Hardness of Directionally Solidified Al-Mg and Al-Mg-Si Alloys

2015 ◽  
Vol 46 (8) ◽  
pp. 3342-3355 ◽  
Author(s):  
Crystopher Brito ◽  
Thiago A. Costa ◽  
Talita A. Vida ◽  
Felipe Bertelli ◽  
Noé Cheung ◽  
...  
Keyword(s):  
Intermetallic Phases ◽  
Directionally Solidified ◽  
Dendritic Microstructure

Cellular Microstructure and Mechanical Properties of a Directionally Solidified Al-1.0wt%Fe Alloy

2010 ◽  
Vol 636-637 ◽  
pp. 564-570 ◽  
Author(s):  
Pedro R. Goulart ◽  
J.E. Spinelli ◽  
F. Bertelli ◽  
Wislei R.R. Osório ◽  
Noé Cheung ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Tensile Tests ◽  
Direct Chill ◽  
Intermetallic Phases ◽  
Cellular Growth ◽  
Directionally Solidified ◽  
Cell Spacing ◽  
Equilibrium Solidification

Upward directional transient solidification experiments have been carried out with an Al-1.0wt%Fe alloy. Tensile tests were carried out with samples collected along the casting length and these results have been correlated with measured cell spacings, since cellular growth has prevailed along the directionally solidified casting. The resulting mechanical properties include ultimate tensile strength, yield tensile strength and elongation. The used casting assembly was designed in such a way that the heat was extracted only through the water-cooled system at bottom of the casting. During non-equilibrium solidification, typical of DC (direct chill) castings, different cooling rates occur from the casting cooled surface up to the top of the casting, causing the formation of metastable intermetallic phases (AlmFe, Al6Fe, etc) in addition to the stable Al3Fe phase. The extensive presence of plate-like Al3Fe phase in the as-cast structure adversely influences the mechanical properties of Al-Fe alloys, since this morphology is more likely to induce microcracks than the fibrous Al6Fe phase. In order to permit an appropriate characterization of these intermetallic phases, they were extracted from the aluminum-rich matrix by using a dissolution technique. These phases were then investigated by optical microscopy and SEM techniques. It was found that the ultimate tensile strength, the yield strength and the elongation increase with decreasing cell spacing and experimental laws correlating cell spacing and these mechanical properties have been established.

scholarly journals Effects of cellular growth on fatigue life of directionally solidified hypoeutectic Al-Fe Alloys

2014 ◽  
Vol 17 (3) ◽  
pp. 767-774 ◽  
Author(s):  
Pryscilla Liberato Ribeiro ◽  
Bismarck Luiz Silva ◽  
Wanderson Santana da Silva ◽  
José E Spinelli
Keyword(s):  
Fatigue Life ◽  
Cellular Growth ◽  
Directionally Solidified ◽  
Fe Alloys
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