On grain refinement of a γ-TiAl alloy using cryo-milling followed by spark plasma sintering

T. Shanmugasundaram; J. Guyon; J. P. Monchoux; A. Hazotte; E. Bouzy

doi:10.1016/j.intermet.2015.07.007

On grain refinement of a γ-TiAl alloy using cryo-milling followed by spark plasma sintering

T. Shanmugasundaram
, J. Guyon
, J. P. Monchoux
, A. Hazotte
, E. Bouzy

Nancy Université
CEMES-CNRS

Research output: Contribution to journal › Article › peer-review

Abstract

Abstract A fully dense fine-grained γ-TiAl based alloy was fabricated by cryo-milling pre-alloyed powders followed by spark plasma sintering. The consolidation was performed at 1050 or 1200 °C. The effect of cryo-milling on the densification kinetics and final microstructure was studied. Results indicate that cryo-milled (8 h) powder is fully densified at a temperature nearly 125 °C lower than that of un-milled powder. The microstructure of the alloy fabricated at different temperatures consisted of fine grains of γ-TiAl and α₂ (Ti₃Al) phases in different volume fractions. The average grain size of cryo-milled powders compacted at 1050 and 1200 °C were determined as 0.6 and 0.9 μm, respectively. It is inferred that the reduction in crystallite and particle size induced by cryo-milling is the likely reason for such enhancement in densification and grain refinement.

Original language	English
Article number	5709
Pages (from-to)	141-148
Number of pages	8
Journal	Intermetallics
Volume	66
DOIs	https://doi.org/10.1016/j.intermet.2015.07.007
Publication status	Published - 21 Jul 2015
Externally published	Yes

Keywords

Cryo-milling
Microstructure
Phase transformation
Spark plasma sintering
Titanium aluminides

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10.1016/j.intermet.2015.07.007

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title = "On grain refinement of a γ-TiAl alloy using cryo-milling followed by spark plasma sintering",

abstract = "Abstract A fully dense fine-grained γ-TiAl based alloy was fabricated by cryo-milling pre-alloyed powders followed by spark plasma sintering. The consolidation was performed at 1050 or 1200 °C. The effect of cryo-milling on the densification kinetics and final microstructure was studied. Results indicate that cryo-milled (8 h) powder is fully densified at a temperature nearly 125 °C lower than that of un-milled powder. The microstructure of the alloy fabricated at different temperatures consisted of fine grains of γ-TiAl and α2 (Ti3Al) phases in different volume fractions. The average grain size of cryo-milled powders compacted at 1050 and 1200 °C were determined as 0.6 and 0.9 μm, respectively. It is inferred that the reduction in crystallite and particle size induced by cryo-milling is the likely reason for such enhancement in densification and grain refinement.",

keywords = "Cryo-milling, Microstructure, Phase transformation, Spark plasma sintering, Titanium aluminides",

author = "T. Shanmugasundaram and J. Guyon and Monchoux, \{J. P.\} and A. Hazotte and E. Bouzy",

note = "Publisher Copyright: {\textcopyright} 2015 Elsevier Ltd.",

year = "2015",

month = jul,

day = "21",

doi = "10.1016/j.intermet.2015.07.007",

language = "English",

volume = "66",

pages = "141--148",

journal = "Intermetallics",

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}

TY - JOUR

T1 - On grain refinement of a γ-TiAl alloy using cryo-milling followed by spark plasma sintering

AU - Shanmugasundaram, T.

AU - Guyon, J.

AU - Monchoux, J. P.

AU - Hazotte, A.

AU - Bouzy, E.

PY - 2015/7/21

Y1 - 2015/7/21

N2 - Abstract A fully dense fine-grained γ-TiAl based alloy was fabricated by cryo-milling pre-alloyed powders followed by spark plasma sintering. The consolidation was performed at 1050 or 1200 °C. The effect of cryo-milling on the densification kinetics and final microstructure was studied. Results indicate that cryo-milled (8 h) powder is fully densified at a temperature nearly 125 °C lower than that of un-milled powder. The microstructure of the alloy fabricated at different temperatures consisted of fine grains of γ-TiAl and α2 (Ti3Al) phases in different volume fractions. The average grain size of cryo-milled powders compacted at 1050 and 1200 °C were determined as 0.6 and 0.9 μm, respectively. It is inferred that the reduction in crystallite and particle size induced by cryo-milling is the likely reason for such enhancement in densification and grain refinement.

AB - Abstract A fully dense fine-grained γ-TiAl based alloy was fabricated by cryo-milling pre-alloyed powders followed by spark plasma sintering. The consolidation was performed at 1050 or 1200 °C. The effect of cryo-milling on the densification kinetics and final microstructure was studied. Results indicate that cryo-milled (8 h) powder is fully densified at a temperature nearly 125 °C lower than that of un-milled powder. The microstructure of the alloy fabricated at different temperatures consisted of fine grains of γ-TiAl and α2 (Ti3Al) phases in different volume fractions. The average grain size of cryo-milled powders compacted at 1050 and 1200 °C were determined as 0.6 and 0.9 μm, respectively. It is inferred that the reduction in crystallite and particle size induced by cryo-milling is the likely reason for such enhancement in densification and grain refinement.

KW - Cryo-milling

KW - Microstructure

KW - Phase transformation

KW - Spark plasma sintering

KW - Titanium aluminides

UR - https://www.scopus.com/pages/publications/84937559006

U2 - 10.1016/j.intermet.2015.07.007

DO - 10.1016/j.intermet.2015.07.007

M3 - Article

AN - SCOPUS:84937559006

SN - 0966-9795

VL - 66

SP - 141

EP - 148

JO - Intermetallics

JF - Intermetallics

M1 - 5709

ER -

On grain refinement of a γ-TiAl alloy using cryo-milling followed by spark plasma sintering

Abstract

Keywords

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