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

Authors : Semih Ağca

Pages : 36-41

View : 32 | Download : 11

Publication Date : 2017-11-29

Article Type : Conference Paper

Abstract :In this study, the effect of production parameters insert ignore into journalissuearticles values(G number, casting atmosphere, and cooling rate); on secondary dendrite arm spacing insert ignore into journalissuearticles values(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