National Key Laboratory for Precision Hot Processing of Metals, School of Materials Science and Engineering, Harbin Institute of Technology
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DOI:
10.7502/j.issn.1674-3962.2014.06.04
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Abstract:
Facted-facted two-phase peritectic solidification behaviors are one of the hotspot of solidification field. In this study, Al-Y peritectic alloys, in which the peritetic phase and primary phase are intermetallic compound with stoichiometric composition, have been chosen for investigation. Using differential scanning calorimetry (DSC), obtained the heating and cooling curves of Al-Y alloys at different strictly controlled cooling rates. Concurrently, the non-equilibrium solidification microstructures were produced. Based on these experimental results, we found that the non-equilibrium solidification characteristics and characteristics of macrosegregation of the facted-facted peritectic alloy solidification process are more obvious than non-faceted peritectic alloys. The solidification characteristic temperature is greatly different to the equilibrium phase diagram. The peritectic reaction temperature and the nucleation temperature of peritectic phase from the melt during cooling are higher than that of the equilibrium phase diagram. The resulting solidification microstructures are also significant differences with the equilibrium phase diagram.