4.5 Article

Effect of vanadium on Fe-rich phase, mechanical properties and thermal conductivity of hypoeutectic Al-Si alloy

Journal

MATERIALS RESEARCH EXPRESS
Volume 8, Issue 2, Pages -

Publisher

IOP Publishing Ltd
DOI: 10.1088/2053-1591/abe5f0

Keywords

Fe-rich phase; vanadium; modification; mechanical property; thermal conductivity

Funding

  1. National Key Research and Development Program of China [2018YFB2001801, 2019YFB2006501]
  2. Science and Technology Development Program of Jilin Province [20190302059GX]

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The study explores the effects of V element addition on the microstructures, mechanical properties, and thermal conductivity of Al-8Si-0.1Cu-0.6Mg-0.7Fe hypoeutectic alloy in gravity die casting. It was found that V modification can influence the size of Fe-rich phases in the alloy, subsequently impacting the mechanical properties and thermal conductivity. Optimal levels of mechanical properties and thermal conductivity were achieved when the content of V element was 0.6%, as excessive V addition led to poor alloy properties.
In this paper, the effects of element V addition (0, 0.2, 0.4, 0.6, 0.8 and 1.0 wt%) on microstructures, mechanical properties and thermal conductivity of Al-8Si-0.1Cu-0.6Mg-0.7Fe hypoeutectic alloy in gravity die casting process were investigated. Microstructure analysis indicates that the size of Fe-rich phase in the Al-Si alloy is greatly affected by the contents of element V addition. The modification of element V could decrease the length of needle-like beta-Fe phase which has the adverse impact to mechanical properties, and promote the formation of short rod-like alpha-Fe phase which has the favorable effect on mechanical properties and thermal conductivity. Then, the dependencies of mechanical properties and thermal conductivity on the size of Fe-rich phase of the alloy is revealed. When the content of element V is 0.6%, the length of Fe-rich phase in the alloy reaches the minimum, and correspondingly both the mechanical properties and the thermal conductivity could achieve the optimal level, as comparison with other contents of element V addition. However, excessive V addition would form VSi2 phase and Fe-rich phase with large size, resulting in poor properties of the alloy.

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