Electron Beam Melting of a β‐Solidifying Intermetallic Titanium Aluminide Alloy. Issue 12 (29th October 2019)

• Record Type: Journal Article
• Authors: Wartbichler, Reinhold; Clemens, Helmut; Mayer, Svea
• Is Part Of: Advanced engineering materials. Volume 21:Issue 12(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-10-29
• Subjects: additive manufacturing -- microstructures -- phase diagrams -- textures -- titanium aluminides; Materials -- Periodicals; 620.11
• DOI: 10.1002/adem.201900800
• Languages: English
• ISSNs: 1438-1656

Abstract

Abstract : The structural features of an electron‐beam‐melted titanium aluminide alloy are presented. The microstructure consisting of γ‐TiAl, α2 ‐Ti3 Al, and βo ‐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 β‐phase preferably along the <001> direction, resulting in a {001} βo 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 β‐solidifying γ‐TiAl‐based alloy, therefore, combines both the characteristics of electron‐beam‐melted Ti and TiAl alloys. Abstract : An electron‐beam‐melted β‐solidifying titanium aluminide alloy shows heterogeneous chemical and phase distributions due to Al evaporation. Solidification occurs via the β‐phase along the <001> direction leading to the formation of a {001} βo fiber texture. A calculated isopleth section of the Ti‐Al‐Nb‐Mo system helps to understand the long‐term intrinsic heat treatment during additive manufacturing.