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Ductility Enhancement Via Microstructural Control in Cr Modified Ni 3AAl Single Crystal

  • S.E. Hsu (a1), Y.P. Wu (a1), T.S. Lee (a1) and S.C. Yang (a1)

Abstract

An attempt to improve the ductility in Cr modified Ni3Al alloys is made by means of microstructural control. In order to select an alloy composition such that it locates in the γ ' single phase region at 1000 °C and in the γ + γ ' two-phase region at 1200 °C of the Ni-Al-Cr ternary phase diagram, we first calculated γ and γ ' phase boundaries, using the Cluster Variation Method. Single crystal specimens with desired composition of Ni-19.5Al-7.5Cr at% were grown and homogenized at the above two temperatures for 72 hours and the mechanical properties were tested at room temperature. It is found that the elongation of specimen homogenized at 1200 °C is almost twice as large as that of one homogenized at 1000 °C. The theoretically predicted microstructures and the γ precipitates are also confirmed by optical, SEM micrographs and EDS analysis. It is concluded that a small amount of disordered γ phase precipitates in the γ ' matrix can drastically enhance the tensile ductility of Ni3Al (Ll2)-base alloys

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Ductility Enhancement Via Microstructural Control in Cr Modified Ni 3AAl Single Crystal

  • S.E. Hsu (a1), Y.P. Wu (a1), T.S. Lee (a1) and S.C. Yang (a1)

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