Formation of Ultrafine-Grained Ti3Al on a Ti48Al2Cr2Nb Intermetallic Alloy Induced by Pulsed Electron Beam Treatment. (18th June 2015)

• Record Type: Journal Article
• Authors: Dong, Jiawei; Zhang, Kemin; Cai, Yang; Zhang, Zhimin; Lei, Yuan; Zhang, Tao
• Other Names: Grosdidier Thierry Academic Editor.
• Is Part Of: Journal of nanomaterials. Volume 2015(2015)
• Publication Date: 2015-06-18
• Subjects: Nanostructured materials -- Periodicals; Nanotechnology -- Periodicals; Nanomatériaux; Nanostructured materials; Nanotechnology; Nanostructures; Nanotechnology; Periodicals; Fulltext; Internet Resources; Periodicals; 620.115
• DOI: 10.1155/2015/389594
• Languages: English
• ISSNs: 1687-4110

Abstract

Abstract : The microstructure modifications, phase, and texture formations encountered in a TiAl based Ti48Al2Cr2Nb intermetallic alloy induced by the high current pulsed electron beam (HCPEB) treatment were carefully investigated using scanning electron microscope (SEM), X-ray diffraction (XRD), and electron backscattered diffraction (EBSD) techniques. The initial material contains the majority γ -TiAl phase and the minority α -Ti3 Al phase. After the HCPEB treatment, the initial α -Ti3 Al was dissolved into the melted layer and the very top surface is covered by ultrafine-grained α -Ti3 Al phase having thermal stress induced cracks. EBSD analyses showed that α -Ti3 Al phase on the very top surface has a001 //ND fiber texture and its texture intensity increases with the number of pulses. The superfast thermal stress cycles and the selective evaporation induced by the HCPEB treatment account for the microstructure modifications and formations of ultrafine α -Ti3 Al in the TiAl based intermetallic alloy.