Calculation the Undercooling of the Directionally Solidified Sn-Zn Eutectic Alloy

Öz

The Sn-8.8 wt. % Zn eutectic alloy was produced by using casting furnace and vacuum melting furnace. Then cast alloys were directionally solidified upwards with a constant temperature gradient (G=4.16 K/mm) at different solidification rates (V=8.3-166.0 m/s) in a Bridgman type controlled directional solidification furnace. The undercooling (T) values are calculated with the Jackson-Hunt model by using the solidification rate, eutectic spacing (and system parameters (K1 and K2). At a constant temperature gradient (G=4.16 K/mm) with the increasing of solidification rate from 8.3 m/s to 166.0 m/s, undercooling increased from 0.87 K to 3.89 K. At minimum undercooling of 0.87 K, the rod eutectic spacing is obtained 3.22 m while the eutectic spacing is obtained 0.72 m at the 3.89 K. The results were compared with the literature.

Anahtar Kelimeler

• Directional Solidification
• Solidification Rate
• Eutectic Spacing
• Undercooling
• Sn-Zn

Doğrusal Katılaştırılmış Sn-Zn Ötektik Alaşımında Altsoğumanın Hesaplanması

Öz

Sn-8.8Zn (kütlece %) ötektik alaşımı döküm fırını ve vakumlu eritme fırını kullanılarak üretildi. Daha sonra döküm alaşımları sabit sıcaklık gradyentinde (G=4.16 K/mm), farklı katılaştırma hızlarında (V=8.3-166.0 m/s) Bridgman tipi kontrollü doğrusal katılaştırma fırınında yukarı yönlü doğrusal katılaştırıldı. Altsoğuma (T) değerleri; katılaştırma hızı, ötektik mesafe () ve sistem parametreleri (K1 ve K2) kullanılarak Jackson-Hunt modeli ile hesaplandı. Sabit bir sıcaklık gradyentinde (G=4.16 K/mm) katılaştırma hızının 8.3 m/s’den 166.0 m/s’ye artmasıyla, altsoğuma 0.87 K’den 3.89 K değerine arttı. 0.87 K değerindeki minimum altsoğumada çubuksal ötektik mesafe 3.22 m, 3.89 K’de ise ötektik mesafe 0.72 m değerlerinde elde edildi. Sonuçlar literatür ile karşılaştırıldı.

Anahtar Kelimeler

• Doğrusal Katılaştırma
• Katılaştırma Hızı
• Ötektik Mesafe
• Altsoğuma
• Sn-Zn

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