Microstructure and Elevated Temperature Tensile Behavior of Directionally Solidified Ni-rich NiAl-Mo(Hf) Alloy

J Mater Sci Technol ›› 2011, Vol. 27 ›› Issue (5): 437-442.

• Mechanical and Functional Properities of Materials • Previous Articles Next Articles

Microstructure and Elevated Temperature Tensile Behavior of Directionally Solidified Ni-rich NiAl-Mo(Hf) Alloy

Ping Han¹⁾, Yihui Qi²⁾, Jianting Guo²⁾

1) Department of Physics, Bohai University, Jinzhou 121013, China
2) Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Received:2010-11-30 Revised:2011-01-19 Online:2011-05-28 Published:2011-05-28
Contact: Ping Han
Supported by:
the Dr. Start Fund of Liaoning Science and Technology Agency (No. 20021071) and the Program of the Innovation Team of Liaoning Office of Education (No. 2006T078)

Abstract

Abstract: The microstructure, high strain rate superplasticity and tensile creep behavior of directionally solidified (DS) NiAl-Mo(Hf) alloy have been investigated. The alloy exhibits dendritic structure, where dendritic arm is NiAl phase, interdendritic region is Ni₃Al phase, and Mo-rich phase distributes in the NiAl and Ni₃Al phases. The alloy exhibits high strain rate superplastic deformation behavior, and the maximum elongation is 104.2% at 1373 K and strain rate of 1.04×10^-2 s^-1. The balance between strain hardening (by dislocation glide) and strain softening (by dynamic recovery and recrystallization) is responsible for the superplastic deformation. All the creep curves of the DS NiAl-Mo(Hf) alloy have similar shape of a short primary creep and dominant steady creep stages, and the creep strain is great. The possible creep deformation mechanism was also discussed. The creep fracture data follow the Monkman-Grant relationship.

Key words: NiAl alloy, Directional solidification, Superplasticity, Creep

Ping Han, Yihui Qi, Jianting Guo. Microstructure and Elevated Temperature Tensile Behavior of Directionally Solidified Ni-rich NiAl-Mo(Hf) Alloy[J]. J Mater Sci Technol, 2011, 27(5): 437-442.

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Microstructure and Elevated Temperature Tensile Behavior of Directionally Solidified Ni-rich NiAl-Mo(Hf) Alloy

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