Startseite Intermetallic precipitation in rare earth-treated A413.1 alloy: A metallographic study
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Intermetallic precipitation in rare earth-treated A413.1 alloy: A metallographic study

  • Agnes M. Samuel , Herbert W. Doty , Salvador Valtierra und Fawzy H. Samuel
Veröffentlicht/Copyright: 29. Januar 2018
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International Journal of Materials Research
Aus der Zeitschrift International Journal of Materials Research Band 109 Heft 2

Abstract

The present study was performed mainly on A413.1 alloy. Measured amounts of La, Ce or La+Ce, Ti and Sr were added to the molten alloy in the form of master alloys. Samples sectioned from castings obtained from thermal analysis experiments were used for preparing samples for metallographic examination. The results show that addition of rare earth (RE) metals to Al–Si alloys increased the α-Al nucleation temperature and depressed the Al-Si eutectic formation temperature, thereby increasing the solidification range. Depending upon the alloying elements/additives, a large number of RE-based intermetallics could be formed: Al4(Ce,La), Al13(Ce,La)2Cu3, Al7(Cu,Fe)6(Ce,La)6Si2, Al4La, Al2La5Si2, Al2Ce5Si2, Al2(Ce,La)5Si2. Under an electron microscope, these phases appear in backscatter imaging mode in the form of thin grayish-white platelets on the dark gray Al matrix. The average thickness of these platelets is about 1.5 μm. When the alloy is grain refined with Ti-based master alloys, precipitation of a gray phase in the form of sludge is observed: Al12La3Ti2, or Al12(Ce,La)3Ti2. Regardless the alloy composition, the RE/Al ratios remain constant in each type of intermetallic. Rare earth metals have a strong affinity to react with Sr (resulting in partial modification of the eutectic Si particles) as well as some transition elements, in particular Ti and Cu. Iron has a very low affinity for interaction with RE metals. It is only confined to Fe-based intermetallics.

Keywords: Rare earth metals; Transition metals; Al–Si alloys; Sr modification; Electron microscopy
*Correspondence address, Professor Fawzy H. Samuel, Département des Sciences appliquées, Université du Québec à Chicoutimi, 555 Boulevard de l'Université, Chiocutimi, QC, G7H 2B1, Canada, Tel.: +(418) 545-5406, Fax: +(418) 545-5012, E-mail: , Web: www.uqac.ca

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Received: 2017-06-14
Accepted: 2017-09-19
Published Online: 2018-01-29
Published in Print: 2018-02-12

© 2018, Carl Hanser Verlag, München

Artikel in diesem Heft

  1. Contents
  2. Contents
  3. Original Contributions
  4. Phase-field simulation of the solidified microstructure in a new commercial 6××× aluminum alloy ingot supported by experimental measurements
  5. Hydrogen sorption and corrosion properties of La2Ni9CoSn0.2 alloy
  6. Isothermal sections of the Co–Ni–Ti system at 950 and 1 000 °C
  7. Experimental and theoretical study of temperature-dependent variable stiffness of magnetorheological elastomers
  8. Photocatalytic properties of nano-structured carbon nitride: a comparison with bulk graphitic carbon nitride
  9. Effects of solution treatment on mechanical properties and corrosion resistance of 4A duplex stainless steel
  10. Three-body abrasive wear behaviour of metastable spheroidal carbide cast irons with different chromium contents
  11. Intermetallic precipitation in rare earth-treated A413.1 alloy: A metallographic study
  12. Short Communications
  13. Microstructure and magnetic properties of iron–cobalt-based alloys processed by metal injection moulding
  14. Solid-state synthesis and magnetic properties of rhombohedral phase Mg2SiNi3
  15. DGM News
  16. DGM News
https://doi.org/10.3139/146.111591
Schlagwörter für diesen Artikel
Rare earth metals; Transition metals; Al–Si alloys; Sr modification; Electron microscopy

Artikel in diesem Heft

  1. Contents
  2. Contents
  3. Original Contributions
  4. Phase-field simulation of the solidified microstructure in a new commercial 6××× aluminum alloy ingot supported by experimental measurements
  5. Hydrogen sorption and corrosion properties of La2Ni9CoSn0.2 alloy
  6. Isothermal sections of the Co–Ni–Ti system at 950 and 1 000 °C
  7. Experimental and theoretical study of temperature-dependent variable stiffness of magnetorheological elastomers
  8. Photocatalytic properties of nano-structured carbon nitride: a comparison with bulk graphitic carbon nitride
  9. Effects of solution treatment on mechanical properties and corrosion resistance of 4A duplex stainless steel
  10. Three-body abrasive wear behaviour of metastable spheroidal carbide cast irons with different chromium contents
  11. Intermetallic precipitation in rare earth-treated A413.1 alloy: A metallographic study
  12. Short Communications
  13. Microstructure and magnetic properties of iron–cobalt-based alloys processed by metal injection moulding
  14. Solid-state synthesis and magnetic properties of rhombohedral phase Mg2SiNi3
  15. DGM News
  16. DGM News
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