Abstract
The microstructure and elevated temperature compressive properties of a rapidly solidified NiAl–Cr(Nb)/Dy alloy fabricated by injection casting were investigated. The results reveal that the microstructure of the rapidly solidified alloy gets great refinement. The coarse Cr 2Nb phase at the NiAl phase boundary in conventionally-cast alloy is replaced by NiAl/Cr 2Nb lamellar eutectic microstructure in rapidly solidified alloy. In addition, in the rapidly solidified NiAl–Cr(Nb)/Dy alloy Cr 7Ni 3 rod-like particles precipitate in Cr 2Nb phase, but no Ni 5Dy particles precipitate. Compared with the conventionally-cast alloy, the rapidly solidified alloy owns more excellent elevated temperature compressive properties.
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