Effect of ultrasonic vibration on Fe-containing intermetallic compounds of hypereutectic Al–Si alloys with high Fe content

2013 ◽  
Vol 23 (5) ◽  
pp. 1245-1252 ◽  
Author(s):  
Chong LIN ◽  
Shu-sen WU ◽  
Gu ZHONG ◽  
Li WAN ◽  
Ping AN
Keyword(s):  
Intermetallic Compounds ◽  
Ultrasonic Vibration ◽  
Fe Content

Needle Like Fe-Containing Intermetallic Compounds of High Silicon Aluminum Alloy with Fe Modified by Mn and Ultrasonic Vibration

2016 ◽  
Vol 879 ◽  
pp. 2286-2292 ◽  
Author(s):  
Gu Zhong ◽  
Shu Sen Wu ◽  
Chong Lin ◽  
Hiromi Nagaumi
Keyword(s):  
Intermetallic Compounds ◽  
Ultrasonic Vibration ◽  
Liquidus Temperature ◽  
Volume Fraction ◽  
Primary Silicon ◽  
Combined Effects ◽  
Fe Content ◽  
Close Relationship ◽  
Total Volume Fraction ◽  
Traditional Process

In this study, the modification effects and mechanism of manganese (Mn) and ultrasonic vibration (USV) on the needle-like Fe-containing intermetallic compounds of Al-20Si-xFe-2.0Cu-0.4Mg-1.0Ni (x=1, 2 wt.%) alloy have been studied respectively. The effect of Fe-containing phases on volume fraction of hard phases is also investigated. The results show that the mechanism and effect of Fe-containing intermetallic compounds improved by Mn are in close relationship with Fe content. Mn can promote to form less harmful α-Al15(Fe,Mn)3Si2 phase, or replace some Fe atoms of β-Al5FeSi and δ-Al4FeSi2 according to different Fe content. When USV was applied to this alloy containing 2%Fe near liquidus temperature, most of the acicular β phases formed in traditional process are substituted by fine plate δ phases. With the combined effects of 0.5%Mn and USV, the acicular β phases are almost repressed and the Fe-containing phases exist in form of fine Al4(Fe,Mn)Si2 and Al5(Fe,Mn)Si particles about 20~30μm. Consequently, the total volume fraction of hard phases which are composed of primary silicon particles and Fe-containing phases increases significantly.

scholarly journals Morphology of Intermetallic Compounds in Al-Si-Fe Alloy and Its Control by Ultrasonic Vibration

2007 ◽  
Vol 48 (9) ◽  
pp. 2467-2475 ◽  
Author(s):  
Yoshiaki Osawa ◽  
Susumu Takamori ◽  
Takashi Kimura ◽  
Kazumi Minagawa ◽  
Hideki Kakisawa
Keyword(s):  
Intermetallic Compounds ◽  
Ultrasonic Vibration

Magnetic Phase Diagrams of Tm2Fe19-xMnx and Tm2Fe17+δ Systems

2014 ◽  
Vol 215 ◽  
pp. 123-126 ◽  
Author(s):  
Anatoly G. Kuchin ◽  
Alexandr M. Gabay ◽  
Galina M. Makarova ◽  
Vladimir I. Voronin ◽  
Ivan F. Berger ◽  
...  
Keyword(s):  
Neutron Diffraction ◽  
Phase Diagrams ◽  
Intermetallic Compounds ◽  
Structural Properties ◽  
Magnetic Measurements ◽  
Magnetic Phase ◽  
Spin Reorientation ◽  
X Ray ◽  
Fe Content ◽  
Ferromagnetic Ordering

The Tm2Fe19-xMnx (x = 0 - 1.5) and Tm2Fe16, Tm2Fe17, Tm2Fe18, Tm2Fe19 intermetallic compounds were synthesized and their magnetic and structural properties were studied. Magnetic measurements, X-ray and neutron diffraction investigations were used. The compounds crystallize in a disordered variant of the hexagonal Th2Ni17-type structure. The lattice parameters a, c increases in the Tm2Fe19-xMnx system, whereas c decreases and a increases in the Tm2Fe19 - Tm2Fe16 system as Fe content decreases. The temperatures of ferromagnetic ordering and spin-reorientation increase as Fe content decreases in these systems. Apparently, the decrease of occupation of defected dumbbell Fe (4e) site causes these regularities.

The Effect of Lithium on the Microstructure and Morphology of Fe-Rich Intermetallic Compounds in 360 Cast Alloy

2011 ◽  
Vol 264-265 ◽  
pp. 1782-1787
Author(s):  
N. Nasiri ◽  
M. Emamy ◽  
M. Bigdeli
Keyword(s):  
Mechanical Properties ◽  
Image Analysis ◽  
Intermetallic Compounds ◽  
Cast Alloy ◽  
Average Length ◽  
Intermetallic Phases ◽  
Maximum Length ◽  
Maximum Reduction ◽  
Fe Content

In this study, the effect of small additions of lithium on the microstructure and morphology of Fe-containing intermetallic compounds in A360 alloy has been investigated. Different Fe contents (1, 1.5 and 2%) were added into A360 alloy, and Li concentrations also varied from 0 to 0.5 wt. %. The image analysis results showed that, the maximum length of β-Al5FeSi plate in Li-modified specimens is changed significantly in comparison with non-modified ones. It is evident that the maximum reduction in the average length of Fe containing platelets occurs in specimens with 2% Fe. Also, the lowest changes in the length of intermetallic phases -as Fe content decreases- occur in the 0.5 wt% Li. At higher Li concentrations, the presence of Al-Li-Si intermetallics in the microstructure can provide undesirable condition. This intermetallic can be so damaging in mechanical properties especially in coarse shapes.

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