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

Yıl 2019, Cilt: 8 Sayı: 1, 549 - 558, 28.01.2019

Uğur Büyük , Sevda Engin , Semra Durmuş Acer Aynur Aker Necmetttin Maraşlı

https://doi.org/10.28948/ngumuh.517188

Öz

   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.

Anahtar Kelimeler

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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