The Effect of Production Parameters on Secondary Dendrite Arm Spacing (SDAS) and Estimation of Cooling Rate by SDAS in Functionally Graded Al-Cu Eutectic Alloy

Year 2017, Volume: 1 Issue: 1, 36 - 41, 29.11.2017

Semih Ağca

Abstract

In this study, the effect of production parameters (G number, casting
atmosphere, and cooling rate) on secondary dendrite arm spacing (SDAS) and
estimation of cooling rate by SDAS in functionally graded Al-Cu eutectic alloy
are investigated. Functionally graded Al-Cu eutectic alloy is fabricated by
centrifugal casting method. Different productions are carried out by changing cooling
rate, G number and casting atmosphere. Cooling rate is controlled by a novel
mold design and 0,09 K/s, 1,04 K/s, 1,96 K/s and 2,82 K/s cooling rates are
obtained by using this mold. 10, 20 and 30 G numbers are obtained by changing
the mold rotation speed. Air and 200 mBar vacuum atmospheres are preferred as
casting atmospheres. SDASs are measured by Leica Application Suite V 4.6 image
analysis software. Apparent interlamellar spacing is used in measurements. It
is found that cooling rate alteration has a significant influence on SDAS. In
addition to this, G number and casting atmosphere affected the SDAS by
affecting the cooling rate. SDAS increased with the decreasing of cooling rate.
Successful results are obtained in cooling rate estimation.  

Keywords

Aluminum alloys, FGM, SDAS, cooling rate

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