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Effects of rare-earth element addition and heat treatment on the microstructures and mechanical properties of Al-25 % Si alloy

  • Bo Dang , Zengyun Jian and Junfeng Xu
Published/Copyright: March 31, 2017
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 108 Issue 4

Abstract

The effects of pouring temperature, the content of a rare earth (RE) metal modifier, and T6 heat treatment on the microstructure and mechanical properties of Al-25 % Si alloy were investigated. The results show that for the unmodified alloy, the morphology of primary Si was transformed from coarse polygons and platelets to fine polyhedral, and the average size decreased with increasing pouring temperature. The primary Si exhibited a small blocky morphology with an average size of 47 μm at an optimal content of 1.2 % RE. The tensile strength and elongation were enhanced by the addition of RE followed by the T6 heat treatment, and the maximum tensile strength and elongation (208.3 MPa and 1.01 %) were obtained for the sample modified with 1.2 % RE followed by the T6 heat treatment.

Keywords: Al-25 % Si alloy; Rare earth metals; Heat treatment; Microstructure; Mechanical properties
*Correspondence address, Prof. Zengyun Jian, The Shaanxi Key Laboratory of Photoelectric Functional Materials and Devices, Xi'an Technological University, Xuefu Middle Road No. 2, Xi'an Shaanxi 710021, P. R. China, Tel.: +86-29-86173323, Fax: +86-29-86173323, E-mail:

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Received: 2016-11-01
Accepted: 2017-01-10
Published Online: 2017-03-31
Published in Print: 2017-04-13

© 2017, Carl Hanser Verlag, München

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https://doi.org/10.3139/146.111477
Keywords for this article
Al-25 % Si alloy; Rare earth metals; Heat treatment; Microstructure; Mechanical properties

Articles in the same Issue

  1. Contents
  2. Contents
  3. Original Contributions
  4. Formation of intermetallic compounds and their effect on mechanical properties of aluminum–titanium alloy films
  5. Microstructure and properties of hot extruded Mg-3Zn-Y-xCu (x = 0, 1, 3, 5) alloys
  6. Effects of rare-earth element addition and heat treatment on the microstructures and mechanical properties of Al-25 % Si alloy
  7. Effects of silicon on characteristics of dynamic strain aging in a near-α titanium alloy
  8. Influence of heat treatment on the structure, hardness and strength of ZnAl40Cu3 alloy
  9. W–Cu composites subjected to heavy hot deformation
  10. Electrochemical performance of CuBi2O4 nanoparticles synthesized via a polyacrylamide gel route
  11. Mechanical properties of nano-SiO2 reinforced 3D glass fiber/epoxy composites
  12. Reinforcement effect and synergy of carbon nanofillers with different dimensions in high density polyethylene based nanocomposites
  13. Short Communications
  14. A general method towards transition metal monoboride nanopowders
  15. DGM News
  16. DGM News
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