Liquidus projection of Al-rich corner of the ternary AleFeeU system

摘要

Microstructures of the solidified AleFeeU ternary alloys have been examined using optical and scanning electron microscopy. Phase content and chemical composition of the different phases present was determined by Energy-Dispersive Spectrometry and X-ray diffraction. Differential Scaling Calorimetry was used for analysis of thermal effects accompanied phase transformations in the course of solidification. On the basis of results obtained liquidus projection was constructed for Al-rich corner of the AleFeeU system. Two ternary peritectic reactions have been found to occur. It was proposed that 1) an orthorhombic phase UFe2Al10 is formed by ternary peritectic reaction: UAl_3 + Al_(13)Fe_4 + Al_((L))→UFe_2Al_(10) within the temperature range of 850-1157℃; 2) tetragonal phase U2FeAl20 is formed by ternary peritectic reaction: UAl_4 + UFe_2Al_(10) + Al_((L)) → U_2FeAl_(20) at a temperature of about 639℃.