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Journal of Materials Engineering and Performance

Published in:

04-03-2019

Precipitation of Carbides and Dissolution of Widmanstätten Structure for Enhanced Hardness in Ti₂AlNb-Based Alloys

Authors: Yaran Zhang, Qi Cai, Yongchang Liu, Qianying Guo, Huijun Li

Published in: Journal of Materials Engineering and Performance | Issue 3/2019

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Abstract

Carbide-reinforced Ti₂AlNb matrix composites were spark plasma sintered at 1100 °C by incorporating CNTs into single-B2-phase Ti-22Al-25Nb powders. The as-SPSed alloys were solution treated and then aged in different phase regions. By kinetics analysis and energy-dispersive spectroscopy, it is found carbon will stabilize α₂ phase during solution treatment, and the formation of carbide results in the Nb-depleted regions, which further induces the formation of curly B2 + O Widmanstätten structure during quenching. Different from the general Widmanstätten structure in the aged Ti₂AlNb alloy, the remained α₂ will consume the B2 within the Widmanstätten structure, when the carbon-added alloy is aged in B2 + O phase region. Compared to the alloy without CNTs, the Vickers hardness of the aged carbon-added Ti₂AlNb alloy is increased significantly, which is related to the uniform and abundant columnar carbides within the O-phase matrix.

previous article Microstructural and Property Evolution of Continuous Columnar-Grained Polycrystalline Copper during Extreme Plastic Deformation at Room Temperature

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Title: Precipitation of Carbides and Dissolution of Widmanstätten Structure for Enhanced Hardness in Ti2AlNb-Based Alloys
Authors: Yaran Zhang
Qi Cai
Yongchang Liu
Qianying Guo
Huijun Li
Publication date: 04-03-2019
Publisher: Springer US
Published in: Journal of Materials Engineering and Performance / Issue 3/2019
Print ISSN: 1059-9495
Electronic ISSN: 1544-1024
DOI: https://doi.org/10.1007/s11665-019-03965-9

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