Aging Hardening of γ₁-Ti₄Nb₃Al₉ Phase in Ti-48Al-10Nb Alloy

Abstract:

A Detailed Transmission Electron Microscopy (TEM) Study Has Been Made of the Ageing Hardening Behavior of the γ₁-Ti₄Nb₃Al₉ Precipitation Phase in the γ-TiAl Matrix in Ti-Al-Nb System. it Is Revealed that the γ₁-Ti4Nb₃Al₉ Precipitate, which Is Formed by a Normal Quench at 1473k and Ageing Treatment at 1073K, Takes Needle-Like Morphology with a Growing Axis Parallel to [001] Direction of the Matrix. the Needle-Like Precipitates Act as Barrier Grid to Inhibit Dislocation Moving on the Slipping Plane {111} of the γ-TiAl Matrix, which Helps to Improve the Strength of the Alloy. the Effects of the Third Element Niobium to the Strengthen of High Nb Containing TiAl Alloys Lie in Not only Solid Solution, but Also Ageing Hardening. the Interfaces between Precipitate and Matrix Are Also Investigated.

• Periodical: Advanced Materials Research (Volume 320)
• Pages: 8-13
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.320.8
• Online since: August 2011
• Authors: Guang Cai Su, Jia Ying Huang, Long Fei Qin, Hong Wei Liu
• Keywords: Aging, High-Resolution Electron Microscopy (HREM), Interface, Titanium Aluminide

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