Crystallographic characteristics of an integrally directionally solidified Nb-Ti-Si based in-situ composite. (October 2017)

• Record Type: Journal Article
• Authors: Ma, Xiao; Guo, Xiping; Fu, Maosen; Guo, Haisheng
• Is Part Of: Scripta materialia. Number 139(2017)
• Page Start: 108
• Page End: 113
• Publication Date: 2017-10
• Subjects: Nb-Ti-Si based in-situ composite -- Directional solidification -- Eutectic microstructure -- Preferred growth orientation -- Interface structure; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2017.06.035
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Crystallographic characteristics have great effects on the performance of directionally solidified Nb-Ti-Si based in-situ composite, which is mainly composed of parallel Nbss/γNb5 Si3 eutectic cells along the longitudinal axis of the specimens. Nbss and γNb5 Si3 grow up in a coupled manner and exhibit preferred growth orientation along [111]Nb and 000 1 ¯ γ zone axes, respectively. Under these orientations, two types of coherent interfaces have been formed between the two phases, corresponding to the different morphologies of γNb5 Si3 . The preferred growth orientations and coherent interface structures might promote the coupled growth and enhance the stability of the eutectic cells of this in-situ composite. Graphical abstract: