Electron Beam Melting of a β‐Solidifying Intermetallic Titanium Aluminide Alloy
ADVANCED ENGINEERING MATERIALS(2019)
摘要
The structural features of an electron-beam-melted titanium aluminide alloy are presented. The microstructure consisting of gamma-TiAl, alpha(2)-Ti3Al, and beta(o)-TiAl reveals inhomogeneous phase and Al distributions, which are quantified by electron probe microanalysis. Electron backscatter diffraction is utilized to indicate a solidification via the beta-phase preferably along the <001> direction, resulting in a {001} beta(o) fiber texture parallel to the building direction. These findings are correlated to a calculated isopleth section of the Ti-Al-Nb-Mo system and the corresponding phase fraction diagram. The investigated beta-solidifying gamma-TiAl-based alloy, therefore, combines both the characteristics of electronbeam-melted Ti and TiAl alloys.
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关键词
additive manufacturing,microstructures,phase diagrams,textures,titanium aluminides
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