Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 723, Issue -, Pages 279-286Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2018.03.053
Keywords
Cu-rich phase; Precipitation hardening; Atom probe tomography; Fe-Cu-Ni-Al alloy; Ageing
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Funding
- National Key Research and Development Program of China [2017YFB0703002]
- State Key Lab of Rolling and Automation of Northeastern University Development Fund [2016002]
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Fe-Cu and Fe-Cu-Ni-Al alloys were aged at 500 degrees C for different time after solution treatment at 900 degrees C for 2 h. The influence of co-addition of Ni and Al on the microstructure evolution of Cu-rich phase was studied using atom probe tomography (APT). APT results showed that the addition of Ni and Al effectively increased the number density of Cu-rich particles and reduced their sizes with a narrow size distribution. In the peak hardness condition, the precipitates in the Fe-Cu-Ni-Al alloy exhibited a core-shell structure with the Cu-rich phase in the core and NiAl phase in the outer shell, leading to a dramatic improvement of peak hardness and strength. The NiAI shell of the precipitates impeded the growth and coarsening of the Cu-rich phase by decreasing the interfacial energy and the diffusion rate of Cu, Ni and Al atoms in the shell. After further ageing, the core-shell structure of the precipitates decomposed, forming separate Cu-rich phase and NiAI phase.
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