Browsing by Author "Mekhrabov, Amdulla O."

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Citation - WoS: 4
Citation - Scopus: 4
Effect of Y Addition on the Structural Properties and Oxidation Behavior of Fe60al40-Nyn Alloys (n=1, 3, and 5 At.%)
(Taylor & Francis Ltd, 2022) Yıldırım, Mehmet; Ataş, Mehmet Şahin; Akdeniz, M. Vedat; Mekhrabov, Amdulla O.
The influence of Y addition on the microstructural features, phase relationships, hardness, magnetic behaviour and cyclic oxidation performance of Fe60Al40-nYn alloys (n = 1, 3, and 5 at.%) has been examined in detail. Al8Fe4Y phase formed even at 1 at.% Y addition because of the limited solid solubility of Y in the FeAl-based phase. For all the examined compositions, the Al8Fe4Y phase developed a eutectic with the FeAl-based phase and its volume fraction increased with increasing Y up to 5 at.%, which is near the eutectic composition. The mean microhardness values increased with increasing Y content for both as-cast and heat-treated samples. Cyclic oxidation tests revealed that the oxidation rate and scale thickness increased with increasing Y content. alpha-Al2O3 was the main surface oxide for all compositions. theta-Al2O3 was also formed with relatively low amount. An internal oxidation layer composed of mixed Al/Y oxides was observed beneath the surface layer.
Microstructure, Phase Relationships and Microhardness of Fe60al40-Nhfn Alloys (n=1, 3, and 5 At.%)
(WALTER DE GRUYTER GMBH, 2021) Yıldırım, Mehmet; Çetinbakış, Neşe; Culu, Ayşe; Akdeniz, M. Vedat; Mekhrabov, Amdulla O.
The microstructural evolution, solidification behavior, phase relationships, microhardness and room temperature magnetic properties of the hypoeutectic Fe60Al40-nHfn (n = 1, 3, and 5 at.%) compositions are investigated in detail. The microstructure of the studied alloys is composed of Fe-Al based dendrites and eutectic mixture. The components of the eutectic are B2 Fe-Al based and HfFe6Al6 tau(1) phases. With increasing Hf fraction, the amounts of eutectic and tau(1) phases increase continuously which results in significant strengthening. Based on the differential scanning calorimetry results, the eutectic reaction temperature is measured as 1251 degrees C. Fe60Al40-nHfn alloys show weak room temperature ferromagnetism and their magnetization values also increase with increasing Hf content.