Abstract
The effect of solidification rate on the solidified structure and mechanical properties of NiAl–28Cr–5Mo–1Hf (at.%) alloy are experimentally investigated in the paper. With the increasing solidification rate, three types of the solidified structure were identified: planar, cellular and dendritic. Microhardness and compressive yield stress of the alloy at the tested temperature range increase with increasing solidification rate varying from 3.33 to 30 μm s −1. The strengthening behavior was attributed to a combined effect of the decrease in average interlamellar spacing and more homogeneous distribution of fine precipitates with the increase in solidification rate.
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