Abstract
Intermetallics Ti–49Al (at.%) alloy was directionally solidified with different growth rates ( V = 5 μm/s–30 μm/s) at a constant temperature gradient ( G = 12.1 K/mm) by using a Bridgman type directional solidification furnace. The primary dendritic spacing ( λ), interlamellar spacing ( λ L), and microhardness ( HV) were measured. Effect of V on HV, λ and λ L was experimental investigated. The dependencies of λ, λ L and HV on the growth rate were determined by using linear regressing analysis. According to the result, the values of λ and λ L decrease with the increasing of V, and the values of HV increase with the increasing of V and with the decreasing of λ and λ L. The results were compared with previous similar experimental results for TiAl-based alloys.
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