MICROSTRUCTURAL EVOLUTION AND MECHANICAL BEHAVIOR OF In–Bi–Cd EUTECTIC ALLOY

Abstract

   In–30.8%Bi–7.5%Cd (wt.) alloy was directional solidified at different growth rates (V=2.9–173.8 µm/s) in a Bridgman type equipment. The microstructure of In–Bi–Cd alloy was observed, which resulted lamellae of In₂Bi phase, In–rich () phase, and Cd phase from quenched samples. The eutectic spacing, microhardness   and ultimate tensile strength of alloy were measured from directionally solidified samples, and the relationships between them were experimentally obtained using both linear regression analysis and Hall–Petch type correlations. The local lamellae and rod–like phase structures which were grown around primary In₂Bi phase have been observed in the microstructure of the solidified alloys larger than 80 µm/s growth rate. As growth rate increases, the volume percentage of primary In₂Bi phases increase. And also it was found that, as the growth rate increases from 2.9 to 173.8 µm/s, the values of microhardness and ultimate tensile strength increases about two times. The values of the eutectic spacing, microhardness and ultimate tensile strength for In–Bi–Cd eutectic alloys were compared with similar eutectic alloys.

Keywords

• Solidification,microstructure,tensile test,hardness test

In-Bi-Cd ÖTEKTİK ALAŞIMININ MİKROYAPISAL DEĞERLENDİRİLMESİ VE MEKANİK DAVRANIŞI

Öz

   In–%30.8Bi–7.5Cd (ağ.) ötektik alaşımı Bridgman tipi kontrollü katılaştırma fırınında farklı katılaştırma hızlarında (V=2.9–173.8 µm/s) tek yönlü katılaştırılmıştır. Yapılan deneyler neticesinde In–Bi–Cd ötektik alaşımının mikroyapısında; In₂Bi lamelsel, In–esaslı (ε) ve Cd fazları gözlenmiştir. Kontrollü katılaştırma deneyleri yapılan her bir numune için gözlenen mikroyapılar arası mesafeler, mikrosertlikleri ve maksimum çekme–dayanım değerleri ölçülmüştür. Deneysel olarak elde edilen değerler arasındaki ilişkileri ortaya koyabilmek için ise lineer regrasyon analizi ve Hall–Petch tipi bağıntılar kullanılmıştır. Kontrollü katılaştırma deneylerinde 80 µm/s’nin üzerinde katılaştırma hızına sahip numunelerde birincil In₂Bi fazları etrafında bölgesel olarak lamelsel ve çubuksal fazların oluştuğu gözlenmiştir. Çünkü katılaştırma hızı arttıkça In₂Bi fazının hacim yüzdesi de artmıştır. Ayrıca katılaştırma hızı 2.9 µm/s’den 173.8 µm/s’e kadar artırıldığında mikrosertlik ve maksimum çekme–dayanım değerlerinin yaklaşık iki kat arttığı belirlenmiştir. In–Bi–Cd alaşımı için elde edilen mikroyapılar arası mesafeler, mikrosertlik ve maksimum çekme–dayanım değerleri benzer deneysel çalışmalar ile kıyaslanmıştır.

Anahtar Kelimeler

• Katılaştırma,mikroyapı,maksimum çekme–dayanım testi,sertlik testi

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