High Temperature Materials and Processes (Mar 2018)

Distribution Behavior of B and P during Al-Si Melt Directional Solidification with Open-Ended Crucible

  • Bai Xiaolong,
  • Ban Boyuan,
  • Li Jingwei,
  • Peng Zhijian,
  • Chen Jian

DOI
https://doi.org/10.1515/htmp-2016-0127
Journal volume & issue
Vol. 37, no. 3
pp. 201 – 208

Abstract

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Distribution behavior of B and P during directional solidification of Al-20Si, Al-30Si and Al-40Si alloys has been investigated. Macrostructure of the Al-Si alloy ingots and concentration profile of elements B and P reveal that the elements segregate to eutectic Al-Si melt during growth of primary Si flakes, and P gradually segregates to the top of the ingots during directional solidification. An apparent segregation coefficient, ka, is introduced to describe the segregation behavior of B and P between the primary Si and the Al-Si melt and compared with thermodynamic theoretical equilibrium coefficients. The apparent segregation coefficients of B and P decrease with increase of solidification temperature.

Keywords