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Effect of Cu on Nanoscale Precipitation Evolution and Mechanical Properties of a Fe–NiAl Alloy

Published online by Cambridge University Press:  21 March 2017

Qin Shen ,
Hao Chen  and
Wenqing Liu
Qin Shen
Affiliation:
Key Laboratory for Microstructures, School of Materials Science and Engineering, Shanghai University, Shanghai 200444, People’s Republic of China
Hao Chen
Affiliation:
Key Laboratory for Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, People’s Republic of China
Wenqing Liu*
Affiliation:
Key Laboratory for Microstructures, School of Materials Science and Engineering, Shanghai University, Shanghai 200444, People’s Republic of China
*
*Corresponding author. [email protected]
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Abstract

The microstructural evolution of precipitation in two model alloys, Fe–NiAl and Fe–NiAl–Cu, was investigated during aging at 500°C for different times using atom probe tomography (APT). The APT results reveal that the addition of Cu effectively increases the number density of NiAl precipitates. This is attributed to Cu promoting the nucleation of NiAl particles by increasing the chemical driving force and decreasing the interfacial energy. The NiAl precipitates of the Fe–NiAl–Cu alloy grow and coarsen at a slower rate than that of the Fe–NiAl alloy, mainly due to the slower diffusion rate of the Cu atoms. The mechanical properties of the two alloys were characterized by Vickers hardness and tension tests. It was found that the addition of Cu results in the formation of core–shell precipitates with a Cu-rich core and a NiAl shell, leading to a dramatic improvement of peak hardness and strength. The effect of Cu on precipitation strengthening is discussed in terms of chemical strength and coherency strength.

Keywords

CuNiAl nanoparticlesprecipitationatom probe tomography
Type
Materials Science (Metals)
Information
Microscopy and Microanalysis , Volume 23 , Special Issue 2: Atom Probe Tomography & Microscopy 2016 , April 2017 , pp. 350 - 359
Copyright
© Microscopy Society of America 2017 

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