Microstructure evolution mechanism of Fe microalloying high Nb–TiAl alloy fabricated by HIP

IF 6.2 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research and Technology-Jmr&t Pub Date : 2025-03-19 DOI:10.1016/j.jmrt.2025.03.170

Yangyang Sun , Feng Chen , Shenwei Qian , Nan Wang , Jie Ding , Hui Chang , Xiaolong Chen , Lian Zhou

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引用次数: 0

Abstract

Ti–45Al–8Nb-0.5 wt%Fe alloy (TiAl–Fe) was ball milled by adding 0.5 wt%Fe to Ti–45Al–8Nb pre-alloyed powder to prepare Fe microalloying high Nb–TiAl alloy by hot isostatic pressing (HIP) process. The microstructure and compressive properties of the TiAl–Fe alloy were systemic studied. The compressive strength of TiAl–Fe samples has been improved to a certain extent. It is found that the content of α₂ phase increases after the addition of Fe element. As hard and brittle phases, B2 and α₂ phases work as obstacles in the deformation, making dislocations accumulate in adjacent γ phase. B2 and α₂ phases indirectly affect the deformation of γ phase by hindering dislocation movement, resulting in stress concentration nearby γ phase. Due to the radius difference between Fe and Al atoms, Fe occupies the position of Al (2e) atoms in γ-TiAl and B2, leading to lattice distortion and dislocation entanglement in γ-TiAl phase. Under the synergistic effect of grain refinement of Fe element and the increase of dislocation density after lattice distortion the strength of the TiAl–Fe is improved.

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来源期刊

Journal of Materials Research and Technology-Jmr&t Materials Science-Metals and Alloys

CiteScore

8.80

自引率

9.40%

发文量

1877

审稿时长

35 days

期刊介绍： The Journal of Materials Research and Technology is a publication of ABM - Brazilian Metallurgical, Materials and Mining Association - and publishes four issues per year also with a free version online (www.jmrt.com.br). The journal provides an international medium for the publication of theoretical and experimental studies related to Metallurgy, Materials and Minerals research and technology. Appropriate submissions to the Journal of Materials Research and Technology should include scientific and/or engineering factors which affect processes and products in the Metallurgy, Materials and Mining areas.