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Surface Remelting‐Mediated Improvement in Oxidation Resistance of Cr 2 Nb‐Containing Nb‐Si‐Based Alloys at High Temperatures
Author(s) -
Guo Yueling,
Jia Lina,
Su Haijun,
Zhang Fengxiang,
Peng Hui,
Zhang Hu
Publication year - 2019
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201900425
Subject(s) - materials science , oxide , microstructure , alloy , spall , metallurgy , layer (electronics) , corrosion , cracking , fabrication , phase (matter) , composite material , medicine , chemistry , alternative medicine , organic chemistry , pathology
The poor oxidation resistance of Nb‐Si‐based alloys generally limits their high‐temperature application. A surface remelting strategy for the formation of protective oxide scales and the improvement of oxidation resistance is reported. Electron beam surface melting (EBSM) is performed on arc‐melted Nb‐14Si‐18Ti‐12Cr‐7Al‐0.2Y (at.%) alloys. The microstructure is significantly refined, without altering the phase regime that consists of an Nb solid solution, βNb 5 Si 3 and Cr 2 Nb. After oxidation at 1200 °C, the EBSM‐remelted layer forms a flatter and more compact oxide scale without significant cracking or spalling than that on the arc‐melted alloy. A continuous SiO 2 oxide layer is formed within the oxide scale on the EBSM‐remelted layer. A reduction of ≈47% in the oxide scale thickness, indicative of improved oxidation resistance, is achieved by the EBSM treatment. The present work provides a promising engineering approach toward the design and fabrication of Nb‐Si‐based alloys with balanced properties.