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The NiAl-28Cr-5.5Mo-0.5Hf eutectic alloy was prepared by the suction casting (SC) technique and subsequent hot isostatic pressing
(HIP) treatment, and tested for compressive strength and fracture behavior in the temperature range of 300 to 1373 K. The
microstructure of suction-cast alloy is characterized by fine interlamellar spacing, large area fraction of eutectic cell,
and fine Heusler (Ni2AlHf) phase distributed semicontinuously at the cell boundaries. After HIP treatment, Ni2AlHf phase at the cell boundaries is transformed into Hf solid solution phase and distributed homogeneously within the NiAl
matrix. Compared with the conventionally cast alloy, the room-temperature compressive strain and elevated temperature strength
of suction-cast alloy are enhanced markedly after HIP treatment. The reason is that the HIP treatment causes Hf solid solution
phase to distribute homogeneously and then strengthens the NiAl matrix.
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J. T. Guo (Professor)Email: |
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