High-throughput analysis of Al and Nb effects on mechanical behaviour of TiAl alloys using electromagnetic cold crucible continuous casting

摘要

To optimize the microstructure and mechanical properties of TiAI-based alloys, a novel high-throughput preparation method was developed using the electromagnetic cold crucible continuous casting (ECCCC) technique. Ti-48Al/Ti-44Al (at.%) and Ti-47Al-10Nb/Ti-47Al high-throughput gradient materials (HTGMs) were successfully fabricated using the ECCCC technique. Composition, microstructure and mechanical properties were systematically investigated. The results show that the HTGMs exhibit continuous and subtle variations in composition. The solute content at different pulling lengths was calculated, with the composition gradient controlled by the height of the molten pool. Using this method, the optimized composition of Ti-47Al-6Nb was determined by studying Ti-48Al/Ti-44Al and Ti-47Al-10Nb/Ti-47Al HTGMs. The ECCCC technique provides a new method to fabricate TiAI-based HTGMs; it is suitable for studying the effects of solute content on microstructure and mechanical properties. (C) 2018 Elsevier B.V. All rights reserved.