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Article Dans Une Revue Intermetallics Année : 2016

Obtaining of a fine near-lamellar microstructure in TiAl alloys by Spark Plasma Sintering

Résumé

This work presents a study of the Spark Plasma Sintering of a boron and tungsten containing alloy (Ti49,92Al48W2B0,08, called IRIS) as a function of the sintering temperature. Microstructures of sintered alloys are analyzed by scanning and transmission electron microscopies. Investigations mainly focus on a fine near-lamellar microstructure. Attention is paid to both characteristic dimensions of this microstructure and orientation relationships between various phases. The fine near-lamellar microstructure is formed by lamellar grains surrounded by extended γ zones containing β0 precipitates. The size of lamellar grains ranges from 35 to 45 μm while the width of the borders remains between 5 and 10 μm. Effects of both boron addition and sintering temperature are studied. Orientation relationships between γ lamellae and γ grains in the borders, as well as between the γ matrix and the β0 precipitates are investigated. As a result of these investigations, a formation mechanism of this microstructure is proposed and discussed. The origin of the grain growth limitation during the SPS processing is particularly analyzed. © 2016 Elsevier Ltd. All rights reserved.
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Dates et versions

hal-01726305 , version 1 (08-03-2018)

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Thomas Voisin, Jean-Philippe Monchoux, Mickael Perrut, Alain Couret. Obtaining of a fine near-lamellar microstructure in TiAl alloys by Spark Plasma Sintering. Intermetallics, 2016, 71, pp.88-97. ⟨10.1016/j.intermet.2016.01.003⟩. ⟨hal-01726305⟩
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