Effects of Heat Treatment on the Morphology of Primary α Phase and Hardness of B-Refined Al-7 wt% Si Alloy

Abstract:

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The effects of heat treatment on morphology of primary α and hardness of B-refined Al-7 wt% Si alloy are investigated. In addition, the optimum heat treatment procedure is also determined. It is shown that, at 450°C with different holding time from 3h to 12h, morphology of primary α phase is converted from irregular dendrite to granular homogeneous equiaxed grains then to rosette structure. The primary α phase is gradually converted from dendrite into the rosette dendrite and then into particle crystal with increasing of temperature by holding 8h at 300~540°C. One can find fine and uniform distributed particle α phase at 400°C or 450°C. However, the primary α phase has changed into large and irregular shape when the temperature increases up to 450°C. The orthogonal analysis shows that the optimum heat treatment parameters are 540±10°Cand 6h.

Info:

Periodical:

Advanced Materials Research (Volumes 160-162)

Edited by:

Guojun Zhang and Jessica Xu

Pages:

412-417

DOI:

10.4028/www.scientific.net/AMR.160-162.412

Citation:

X. S. Li et al., "Effects of Heat Treatment on the Morphology of Primary α Phase and Hardness of B-Refined Al-7 wt% Si Alloy", Advanced Materials Research, Vols. 160-162, pp. 412-417, 2011

Online since:

November 2010

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Price:

$35.00

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