Combined in situ synchrotron micro X-ray diffraction and high-speed imaging on rapidly heated and solidified Ti–48Al under additive manufacturing conditions. (15th March 2016)

• Record Type: Journal Article
• Authors: Kenel, C.; Grolimund, D.; Fife, J.L.; Samson, V.A.; Van Petegem, S.; Van Swygenhoven, H.; Leinenbach, C.
• Is Part Of: Scripta materialia. Volume 114(2016)
• Page Start: 117
• Page End: 120
• Publication Date: 2016-03-15
• Subjects: X-ray diffraction -- Synchrotron radiation -- Phase transformations -- Titanium aluminides -- Rapid solidification; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2015.12.009
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: An in situ method to study the behavior of alloys during rapid heating and cooling combining laser heating with synchrotron micro X-ray diffraction and high-speed imaging is presented. Near-spherical Ti–48Al specimens were melted using a laser-based heating system consisting of two diode lasers and subsequently rapidly solidified using a Cu support structure. The Al-rich Ti–48Al forms a fine grained dual phase α2 + γ microstructure. Upon solidification, the formation of the β-phase is fully suppressed. Time-resolved peak evolution and temperature-corrected micro X-ray diffraction data provides clear observations of solidification and solid state phase transformations under non-equilibrium conditions similar to beam-based additive manufacturing. Graphical abstract: