Sevda ENGİN, UĞUR BÜYÜK, NECMETTİN MARAŞLI

SICAKLIK GRADYENTİNİN MİKROYAPI VE MİKROSERTLİĞE ETKİSİ

Al–6.5Ni–1.5Fe (ağ.) ötektik bileşiminde hazırlanan alaşım sabit katılaştırma hızında (V = 16.57 µm/s) ve beş farklı sıcaklık gradyentinde (G = 3.23–8.52 K/mm) Bridgman Tipi fırın yardımıyla kontrollü doğrusal katılaştırılarak sıcaklık gradyentinin (G) alaşımın mikroyapı (λ) ve mikrosertlik (HV) özelliklerine etkisi araştırılmıştır. Yapılan deneyler sonucunda oluşan mikroyapılar arası mesafe ve mikrosertlik değerleri ölçülerek sıcaklık gradyentinin mikroyapı ve mikrosertlik üzerine etkisi ortaya çıkarılmıştır. Bu fiziksel özellikler arasındaki ilişki ise lineer regresyon analizi ile belirlenerek benzer deneysel sonuçlarla elde edilen veriler kıyaslanmıştır.

Anahtar Kelimeler:

Kontrollü katılaştırma, sıcaklık gradyenti, mikroyapı, mikrosertlik

THE EFFECT OF TEMPERATURE GRADIENT ON MICROSTRUCTURE AND MICROHARDNESS

Al–6.5Ni–1.5Fe (wt.) alloy was directionally solidified upward at a constant growth rate (V = 16.57 µm/s) and with five different temperature gradients (G = 3.23–8.52 K/mm) by using a Bridgman type directional solidification furnace. In this way it was investigated effect of temperature gradient (G) on microstructure (λ) and microhardness (HV). The distance between microstructures and microhardness values were measured and the effect of temperature gradient on microstructure and microhardness was determined. The relationship between physical properties was determined by linear regression analysis and with the data obtained similar experimental results were compared.

Keywords:

Solidification, Temperature gradient, Microstructure, Microhardness,

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