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Structural and age hardening characteristics of near eutectic Al–Si alloys

  • Kamalpreet Kaur and Om Prakash Pandey
Published/Copyright: May 18, 2013
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 101 Issue 9

Abstract

In the present work structural features of near eutectic Al–Si and Al–Si–Cu alloys prepared by a normal melting and casting route are studied. It is observed that morphology of Si plays an important role in enhancing the mechanical properties of Al–Si alloys. In order to modify the Si network in the matrix of Al some immiscible elements such as Pb, Sn, Cd and Bi have been added in small quantities to the alloy. Since the structure developed after casting governs the mechanical properties, it is essential to understand the structural features before testing the mechanical properties. Taking into consideration the age hardening characteristics of the alloys, microstructural assessment and a thermal study of these alloys have been done. Thermal analysis shows that immiscible elements are homogeneously distributed in the alloys. It is observed that the addition of Pb leads to a rosette type structure, whereas in the case of Cd and Sn blunt and twisted Si needles can be seen. The structural features of the eutectic change to hypoeutectic completely on addition of Bi. The shift in the eutectic depression on addition of a ternary element causes a change in the morphology of Si. Addition of Cu to the Al–Si alloys gives precipitation hardening characteristics.

Keywords: Al–Si alloys; Age hardening; Immiscibility; Microstructure
∗ Correspondence address, Prof. O. P. Pandey School of Physics and Materials Science, Thapar UniversityPatiala-147004, India Tel.: +91 0175 239 3116 Fax: +91 0175 239 3005 E-mail:

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Received: 2009-1-23
Accepted: 2010-6-29
Published Online: 2013-05-18
Published in Print: 2010-09-01

© 2010, Carl Hanser Verlag, München

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https://doi.org/10.3139/146.110393
Keywords for this article
Al–Si alloys; Age hardening; Immiscibility; Microstructure

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. Hans-Peter Degischer – 65th birthday
  5. Basic
  6. X-ray and neutron imaging – Complementary techniques for materials science and engineering
  7. Fast in-situ X-ray micro tomography characterisation of microstructural evolution and strain-induced damage in alloys at various temperatures
  8. Thermo-kinetic computer simulation of differential scanning calorimetry curves of AlMgSi alloys
  9. Influence of stacking fault energy and alloying on stage V hardening of HPT-deformed materials
  10. Thermo-physical properties of silver/carbon fibre composites
  11. Influence of reinforcement contiguity on the thermal expansion of alumina particle reinforced aluminium composites
  12. A continuum based microstructure model of inhomogeneous hardening and recovery as a pre-stage of recrystallization nucleation
  13. Applied
  14. Metal foams – towards microcellular materials
  15. Gigacycle fatigue response of tool steels produced by powder metallurgy compared to ingot metallurgy tool steels
  16. Characterization of the microstructure and damage mechanisms in a Ti6Al4V alloy modified with 1 wt.% B
  17. Structural and age hardening characteristics of near eutectic Al–Si alloys
  18. Stress-corrosion cracking susceptibility of AZ31 alloy after varied heat-treatment in 3.5 wt.% NaCl solution
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