Abstract
In recent years, in order to achieve carbon neutrality, improving the fuel efficiency of aircraft jet engines has become an important
issue in the field of air transportation. TiAl alloys have received considerable attention for aircraft engine application due to their
low density and excellent high temperature strength. However, the poor ductility and high reactivity of the alloys hinder their
precise manufacturing, resulting in large amounts of material waste and high manufacturing costs. Thus, it is necessary to establish
an innovative manufacturing process for the alloys. Recently, electron beam powder bed fusion （EB-PBF） has attracted much
attention to fabricate TiAl alloys since the process can build 3D objects with complex shape. Recently, our research group has
revealed that EB-PBF is a tool that can control the microstructure and mechanical properties of the alloys. In this article, we describe
the microstructural control of β-containing TiAl alloys through EB-PBF. In particular, we illustrate the influences of heat input/
extraction on microstructure, as well as latest developments and efforts in optimizing process conditions using a machine learning.
