Abstract
ABSTRACT In-situ γ-Ti48Al alloys are fabricated using auxiliary wire gas metal arc additive manufacturing in which pure Ti plus Al wires are fused in the arc. This study focuses on the influence of heat input on microstructure and mechanical properties of γ-Ti48Al alloys. As the heat input decreases, the upper part of the homogeneous zone in the middle region always shows α2/γ fully lamellar colonies with the decreased grain size, the dual-phase microstructures in the centric and lower parts gradually transform into fully lamellar colonies, and the volume fraction of α2 phase increases. The average microhardness mainly distributes in the range of 310–490 HV. With a decrease in heat input, the compressive strength in the vertical orientation reduces, and the compression rates in both orientations first decrease and then increase. The fracture morphologies always show a mixed-mode of inter-lamellar and trans-lamellar cleavage fractures.
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