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The microstructure and room temperature fracture toughness of pseudo-binary NiAl–ⅹMo (ⅹ = 7.8, 9, 13 and 16 at. %) in situ composites were investigated. For all four alloys examined, uniform and well-aligned Mo fibrous structures were directionally solidified by the liquid metal cooling process at the growth rate of V = 6 μm/s, respectively. With the increase of the Mo content, the spacing of the...
Solidification microstructure and growth interface morphology of directionally solidified Ni–31Al–32Cr–6Mo(at.%) hypereutectic alloy were studied. The experiments were carried out at higher temperature gradient of about 250 K cm −1 with different withdrawal rates of 4–500 μm s −1 . When the withdrawal rate was less than 50 μm s −1 , the primary Cr(Mo) dendrites were gradually...
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