발간논문

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Vol.36, No.5, 706 ~ 715, 1998
Title
Formation of AIN by gas - melt in - situ reaction in Al - Mg alloys
전형준 , 김도향 , 이명수 , 신광선 Hyeong Joon Jeon , Do Hyang Kim , Myung Soo Lee , Kwang Seon Shin
Abstract
Formation of AlN by means of a melt-gas in-situ reaction in Al-10wt.%Mg and Al-20wt.%Mg alloys has teen investigated. N₂+ 5% H₂ gas was used for AlV formation. Melt-gas in-situ reaction was carried out at 900℃ for 16 and 32hours. Formation of AlN has been identified by a variety of analytic methods : optical, scanning electron, transmission electron microscopies, X-ray diffraction, energy dispersive X-ray spectroscopy and image analyzing technique. AlN particles exist uniformly in the form of clusters mainly at interdendritic area together with the eutectic mixture of α-Al and Al₃Mg₂ The reason for clusters to be formed may be : 1) heterogeneous nucleation on the preexisting AlN particles . 2) reduction of interfacial energy by forming aggregates of particles : or 3) reaction of Al and Mg₃N₂. Individual AlN particle has a shape of a hexagon type thin plate. Amount and size of AlN increased with reaction time. Thickness and width of AlN are approximately 0.3㎛ and 0.9-1.8㎛ respectively after reaction for 16 hours, and approximately 0.3-0.4㎛ and 1.5-2.2㎛ respectively after reaction for 32 hours. AlN/α-Al interface was stable after being exposed at 500℃ Thermodynamic reasoning shows that Mg plays an important role in transferring a nitrogen atom from the gas phase to molten Al by forming intermediate Mg₃N₂ particles which are eventually changed into AlN by reaction with Al melt.
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