Reaction behavior and pore formation mechanism of TiAl-Nb porous alloys prepared by elemental powder metallurgy

Yongfeng Liang; Fan Yang; Laiqi Zhang; Junpin Lin; Shunli Shang; Zi Kui Liu

doi:10.1016/j.intermet.2013.08.001

Reaction behavior and pore formation mechanism of TiAl-Nb porous alloys prepared by elemental powder metallurgy

Yongfeng Liang, Fan Yang, Laiqi Zhang, Junpin Lin, Shunli Shang, Zi Kui Liu

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Abstract

Ti-48Al-6Nb (at.%) porous alloys are fabricated by elemental powder metallurgy to study the pore formation and propagation mechanism. Reactive diffusion, pore formation process, and pore characteristics of the porous TiAl-Nb alloys are investigated at different temperatures. It is found that the porous alloys exhibit a uniform, maze-like network skeleton, viz., a typical α₂-TiAl₃/γ-TiAl fully lamellar microstructure. The reactive diffusivities between Ti and Al powders are dominant during the Ti-Al-Nb powder sintering. Gas release during sintering also plays an important role in the pore propagation and the compact expanding process. In addition, a pore-formation model is proposed to interpret the growth mechanism of pores and skeletons.

Original language	English (US)
Pages (from-to)	1-7
Number of pages	7
Journal	Intermetallics
Volume	44
DOIs	https://doi.org/10.1016/j.intermet.2013.08.001
State	Published - 2014

All Science Journal Classification (ASJC) codes

General Chemistry
Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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10.1016/j.intermet.2013.08.001

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@article{2ed4508ddee843109ef0eb567efa5e8b,

title = "Reaction behavior and pore formation mechanism of TiAl-Nb porous alloys prepared by elemental powder metallurgy",

abstract = "Ti-48Al-6Nb (at.%) porous alloys are fabricated by elemental powder metallurgy to study the pore formation and propagation mechanism. Reactive diffusion, pore formation process, and pore characteristics of the porous TiAl-Nb alloys are investigated at different temperatures. It is found that the porous alloys exhibit a uniform, maze-like network skeleton, viz., a typical α2-TiAl3/γ-TiAl fully lamellar microstructure. The reactive diffusivities between Ti and Al powders are dominant during the Ti-Al-Nb powder sintering. Gas release during sintering also plays an important role in the pore propagation and the compact expanding process. In addition, a pore-formation model is proposed to interpret the growth mechanism of pores and skeletons.",

author = "Yongfeng Liang and Fan Yang and Laiqi Zhang and Junpin Lin and Shunli Shang and Liu, {Zi Kui}",

note = "Funding Information: This research was supported by the National Natural Science Foundation of China (No. 51271016 ), the Beijing Natural Science Foundation (No. 2122043 ), the National Basic Research Program of China (973 Program, No. 2011CB605500 ) and the State Key Laboratory for Advanced Metals and Materials of the University of Science and Technology Beijing (No. 2011-ZD04 ).",

year = "2014",

doi = "10.1016/j.intermet.2013.08.001",

language = "English (US)",

volume = "44",

pages = "1--7",

journal = "Intermetallics",

issn = "0966-9795",

publisher = "Elsevier Ltd",

}

TY - JOUR

T1 - Reaction behavior and pore formation mechanism of TiAl-Nb porous alloys prepared by elemental powder metallurgy

AU - Liang, Yongfeng

AU - Yang, Fan

AU - Zhang, Laiqi

AU - Lin, Junpin

AU - Shang, Shunli

AU - Liu, Zi Kui

N1 - Funding Information: This research was supported by the National Natural Science Foundation of China (No. 51271016 ), the Beijing Natural Science Foundation (No. 2122043 ), the National Basic Research Program of China (973 Program, No. 2011CB605500 ) and the State Key Laboratory for Advanced Metals and Materials of the University of Science and Technology Beijing (No. 2011-ZD04 ).

PY - 2014

Y1 - 2014

N2 - Ti-48Al-6Nb (at.%) porous alloys are fabricated by elemental powder metallurgy to study the pore formation and propagation mechanism. Reactive diffusion, pore formation process, and pore characteristics of the porous TiAl-Nb alloys are investigated at different temperatures. It is found that the porous alloys exhibit a uniform, maze-like network skeleton, viz., a typical α2-TiAl3/γ-TiAl fully lamellar microstructure. The reactive diffusivities between Ti and Al powders are dominant during the Ti-Al-Nb powder sintering. Gas release during sintering also plays an important role in the pore propagation and the compact expanding process. In addition, a pore-formation model is proposed to interpret the growth mechanism of pores and skeletons.

AB - Ti-48Al-6Nb (at.%) porous alloys are fabricated by elemental powder metallurgy to study the pore formation and propagation mechanism. Reactive diffusion, pore formation process, and pore characteristics of the porous TiAl-Nb alloys are investigated at different temperatures. It is found that the porous alloys exhibit a uniform, maze-like network skeleton, viz., a typical α2-TiAl3/γ-TiAl fully lamellar microstructure. The reactive diffusivities between Ti and Al powders are dominant during the Ti-Al-Nb powder sintering. Gas release during sintering also plays an important role in the pore propagation and the compact expanding process. In addition, a pore-formation model is proposed to interpret the growth mechanism of pores and skeletons.

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U2 - 10.1016/j.intermet.2013.08.001

DO - 10.1016/j.intermet.2013.08.001

M3 - Article

AN - SCOPUS:84883865682

SN - 0966-9795

VL - 44

SP - 1

EP - 7

JO - Intermetallics

JF - Intermetallics

ER -

Reaction behavior and pore formation mechanism of TiAl-Nb porous alloys prepared by elemental powder metallurgy

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