Abstract
Abstract A newly designed alloy Ti 44 Al 6 Nb 1.0 Cr 2.0 V 0.15 Y 0.1 B ingot was prepared by the cold crucible directional solidification (CCDS) technique under a range of input power with the constant drawing speed of 8.33 μm/s. Experimental results show that the as-cast microcrack can be eliminated completely after CCDS, and the most desirable microstructure, a high percentage of small angle lamellas microstructure is acquired at input power of 45 kW. It also indicates that the interlamellar space gradually decreases with the increasing of power. The measurement of nanoindentation hardness shows that the hardness of B 2 and γ phase in all cast routes is consistent, but in lamella, the hardness increase linearly with the interlamellar space decrease after logarithm. The relationship between the interlamellar space and the nanoindentation hardness was given. The room temperature tensile results confirmed with the desirable directional solidification microstructure, the highest ultimate tensile strength (UTS) value and the elongation are achieved.
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