Understanding variant selection and texture in additively manufactured red-gold alloys. (1st April 2022)

• Record Type: Journal Article
• Authors: Ghasemi-Tabasi, Hossein; Larcher, Margaux N.D.; Cayron, Cyril; Jhabvala, Jamasp; Van Petegem, Steven; Kalentics, Nikola; Boillat, Eric; Logé, Roland E.
• Is Part Of: Scripta materialia. Number 211(2022)
• Publication Date: 2022-04-01
• Subjects: Laser powder bed fusion (L-PBF) -- Red-gold alloy -- Variant selection -- Electron backscatter diffraction (EBSD) -- X-ray diffraction; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2021.114490
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Printing gold alloys parts is a challenge due to the high reflectivity and thermal conductivity of these materials. Recent studies show an improvement in printing gold using the Laser Powder Bed Fusion (L-PBF) process; however, the impact of the A1→L10 phase transformation on printed red-gold alloy has not been studied. In this work, 3D printed red-gold samples with different post-processing conditions have been heat-treated at 250 °C to investigate the effect of the sample stress states on variant selection, by Electron Backscatter Diffraction. Synchrotron X-ray diffraction experiments reveal the presence of a non-negligible amount of tetragonal phase in the as-build red-gold samples. The use of an intermediate heat treatment at 600 °C to eliminate small domains of tetragonal phase formed during the manufacturing process demonstrates that the crystallographic textures following heat treatment are highly dependent on the stress-state during the early stage of the phase transformation. Graphical abstract: Image, graphical abstract