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Microstructure evolution and hot deformation behavior of spray-deposited TiAl alloys

Published online by Cambridge University Press:  14 August 2018

Yandong Jia ,
Long Xu ,
Pan Ma ,
Konda Gokuldoss Prashanth ,
Chenghui Yao  and
Gang Wang
Yandong Jia
Affiliation:
Laboratory for Microstructures, Institute of Materials, Shanghai University, Shanghai 200444, China
Long Xu
Affiliation:
Laboratory for Microstructures, Institute of Materials, Shanghai University, Shanghai 200444, China
Pan Ma*
Affiliation:
School of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201620, China
Konda Gokuldoss Prashanth
Affiliation:
Department of Manufacturing and Civil Engineering, Norwegian University of Science and Technology, Gjøvik 2815, Norway; Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Leoben A-8700, Austria; and Department of Mechanical and Industrial Engineering, Tallinn University of Technology, Tallinn 19086, Estonia
Chenghui Yao
Affiliation:
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 151001, China
Gang Wang*
Affiliation:
Laboratory for Microstructures, Institute of Materials, Shanghai University, Shanghai 200444, China
*
a)Address all correspondence to these authors. e-mail: [email protected]
b)e-mail: [email protected]
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Abstract

Ti–Al alloys are established as promising candidates for aerospace applications due to their lightweight, good elevated temperature strength, and decent corrosion resistance. In this study, a Ti–51Al (at.%) alloy is fabricated by spray deposition. The effects of temperature and strain rate on the deformation behavior of the spray-deposited Ti–Al alloy are investigated. The microstructural evolution of the Ti–Al alloy with different deformation temperatures is discussed in detail. A strain-dependent constitutive equation was proposed to predict the flow stresses at the elevated temperatures for the spray-deposited Ti–Al alloy. The microstructure of the as-deposited Ti–51Al alloy exhibits a α2/γ lamellar-structure with average size 25 ± 2 μm, due to the high cooling rate observed during solidification. The lamellar structure is embedded on a γ matrix. The amount of the α2/γ lamellar-structure reduces gradually with increasing the hot deformation temperature. After hot isostatic pressing at 1523 K, the microstructure is mainly comprised of the γ matrix.

Keywords

spray depositionrapid solidificationγ-TiAl alloymicrostructurehot deformation
Type
Article
Information
Journal of Materials Research , Volume 33 , Issue 18 , 28 September 2018 , pp. 2844 - 2852
Copyright
Copyright © Materials Research Society 2018 

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